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Python Javascript

Introduction

Example usage and code samples will appear on this column. Choose which language you’d like to view from the menu at the top.

Python examples assume requests is installed. Javascript assumes the use of jQuery

Welcome to the LCO Developer documentation!

Here you will find API documentation, sample code, tutorials and other resources to aid your development with LCO services.

A note about code formatting

An ellipses ... acts as a placeholder for additional data that would otherwise take up too much space. These will not appear in actual API requests or responses. For example, an endpoint that returns the data:

{ "target": { "type": "SIDEREAL", "name": "m42", "ra": 83.8220792, "dec": -5.3911111, "proper_motion_ra": 1.67, "proper_motion_dec": -0.3, "parallax": 0.0, "coordinate_system": "ICRS", "equinox": "J2000", "epoch": 2000.0, }, }

May be shortened in the documentation to:

{ "target": { ... "type": "SIDEREAL", "name": "m42", ... } }

Information relevant to the documentation being described will always be shown.

All dates are in UTC and all date fields are in the ISO 8601 format.

Deprecation Policy

LCO wants to make sure we provide a consistent, performant interface to our network services.

When a public API must undergo a breaking change, we will make our best effort to notify all consumers.

When applicable, APIs will be versioned to provide ample time for clients to adapt. Old versions will stay supported for at least 3 months and can be accessed using a different URL. Example:

https://observe.lco.global/api/v2/

LCO will provide documentation at developers.lco.global in order to make API transitions as easy as possible.

Paginating Results

Any LCO api which returns a list of potentially many results will be paginated. The default limit is usually 100 but may vary based on the type of data being returned.

Results can be iterated on using the limit and offset query parameters. For example, if your query result count is 2200, you can make 3 queries to access all the results:

limit=1000&offset=0

limit=1000&offset=1000

limit=1000&offset=2000

Observations

Api root: https://observe.lco.global/api

Overview

The observations API provides endpoints for submitting and querying observation requests.

Observation requests cannot be edited once they are submitted, but they can be canceled. You may follow their statuses using endpoints outlined below.

Practical examples on how to use this API are provided by scripts linked from the code samples section.

Rate Limits

The observations API is rate limited in order to remain available to all users in the event that a single user attempts to make too many requests in too rapid a succession, causing denial of service to other clients.

Data Format Definition

Observation Request Model Structure

Observation requests follow a hierarchical structure as shown in the diagram below:

Request Model Image

RequestGroup

The top level entity in the LCO request language is the RequestGroup. A RequestGroup contains one or more Requests and acts as a logical grouping to help the end user keep track of a set of Requests. All observing requests are submitted within this top level struture.

A sample RequestGroup returned via the API:

{
    "id": 12345,
    "submitter": "austin_riba",
    "requests": [...],
    "name": "Test observation",
    "observation_type": "NORMAL",
    "operator": "SINGLE",
    "ipp_value": 1.05,
    "state": "PENDING",
    "proposal": "LCOEngineering"
}
Field Read Only Required Options Description
id true false The id of this RequestGroup.
requests false true The list of Requests to be observed for this RequestGroup.
submitter true false The user that submitted the RequestGroup.
proposal false true The Proposal under which this observation will be made.
name false true A string placed in the FITS header as the GROUPID keyword value for all FITS frames originating from this RequestGroup.
observation_type false true NORMAL, RAPID_RESPONSE, TIME_CRITICAL The type of observation. A proposal must be granted time specifically for each observation type. More information can be found here.
operator false true SINGLE, MANY Use SINGLE if you have only one Request, and MANY if you have more than one.
ipp_value false true A multiplier (from 0.5 to 2.0, generally set to 1.05) to your Proposal’s base priority value for this RequestGroup and all of its child Requests. A value > 1.0 will raise your priority and debit your Proposal’s ipp_time_available upon submission. If a Request does not complete, the time debited for that Request is returned. A value < 1.0 will lower your priority and credit your Proposal’s ipp_time_available up to your ipp_limit on the successful completion of a Request. For more information on IPP, see here. Note that ipp time only applies to NORMAL observation_type requests.
state true false PENDING, WINDOW_EXPIRED, COMPLETED, CANCELED The current state of this RequestGroup.

Request

A sample Request returned via the API:

{
    "id": 4,
    "location": {...},
    "configurations": [...],
    "windows": [...],
    "observation_note": "",
    "state": "PENDING",
    "acceptability_threshold": 90
}

A Request is a single independent set of observations to be scheduled in one contiguous block on a resource.

Field Read Only Required Options Description
id true false The id of this Request.
location false true The Location from which this Request should be observed.
configurations false true A list of Configurations.
windows false true A list of Windows in which this Request should be considered for observation.
observation_note false false Text describing this Request.
acceptability_threshold false false The percentage of the observation that must be completed to mark the request as complete and avert rescheduling. The percentage should be set to the lowest value for which the amount of data is acceptable to meet the science goal of the request. Defaults to 100 for FLOYDS observations and 90 for all other observations.
state true false PENDING, WINDOW_EXPIRED, COMPLETED, CANCELED The current state of this Request.

Location

A sample location returned via the API:

{
    "telescope_class": "2m0"
}

A Location specifies a set of restrictions on which resources the Request can be scheduled.

Field Read Only Required Options Description
telescope_class false true 0m4, 0m8, 1m0, 2m0, 4m0 The telescope class which will be used for this observation. The class describes the aperture size, i.e. 1m0 is a 1m telescope, and 0m4 is a 0.4m telescope.

Window

A sample window returned via the API:

{
    "start": "2017-3-22 14:26:08",
    "end": "2017-3-22 14:26:08"
}

A Window specifies one or more datetime intervals during which the Request can be observed. The visibility calculator might be helpful in deciding a window for your observation.

Field Read Only Required Description
start false true The time when the observing window starts.
end false true The time when the observing window ends.

Configuration

A sample configuration returned via API:

{
    "type": "EXPOSE",
    "instrument_type": "2M0-SCICAM-SPECTRAL",
    "instrument_configs": [...],
    "acquisition_config": {...},
    "guiding_config": {...},
    "constraints": {...},
    "target": {...}
}

A Configuration defines the configuration for a set of observations on a single Target.

Field Read Only Required Options Description
type false true EXPOSE, SPECTRUM, LAMP_FLAT, ARC, STANDARD The type of exposure.
instrument_type false true 1M0-SCICAM-SINISTRO, 2M0-SCICAM-SPECTRAL, 0M4-SCICAM-SBIG, 2M0-FLOYDS-SCICAM, 1M0-NRES-SCICAM, SOAR_GHTS_REDCAM, SOAR_GHTS_REDCAM_IMAGER The type of instrument.
constraints false true The observation Constraints placed on this Configuration.
target false true The Target to observe.
instrument_configs false true A list of InstrumentConfigs belonging to this Configuration. When more than one InstrumentConfig is in the list, the first will run to completion, then the second, etc.
acquisition_config false true The AcquisitionConfig of this Configuration
guiding_config false true The GuidingConfig of this Configuration

InstrumentConfig

A sample instrument configuration returned via API:

{
    "exposure_time": 30.0,
    "exposure_count": 1,
    "bin_x": 1,
    "bin_y": 1,
    "mode": "full_frame",
    "rotator_mode": "",
    "optical_elements": {
        "filter": "R"
    },
    "extra_params": {
        "defocus": 0.0
    }
}

An InstrumentConfig defines a set of exposures using certain instrument settings. To read about instruments and their possible configurations, you can go here. For information on the SOAR GHTS instrument specifically, go here.

Observations may be de-focused by offsetting the secondary mirror from its focused position to prevent the CCD from saturating on bright targets. Limits of the offset are ±3mm. De-focus may be specified as an InstrumentConfig extra parameter with the defocus field. For more information, you can look though the “Getting Started” guide linked from here.

Field Read Only Required Options Description
exposure_time false true Exposure time in seconds. A tool to aid in deciding on an exposure time is located here.
exposure_count false true The number of exposures to take. This field must be set to a value greater than 0, but optionally you can add a boolean fill_window field to the InstrumentConfig upon submission with a value of true. If this is set, the exposure_count is set to the number of exposures (including overheads) that will fit in the observing window.
bin_x false false Binning in the x dimension, defaults to the instrument default.
bin_y false false Binning in the y dimension, defaults to the instrument default.
rotator_mode false false SKY, VFLOAT (Spectrograph only) How the slit is positioned on the sky. If set to VFLOAT, atmospheric dispersion is along the slit. If the rotator_mode is set to SKY, a rotator_angle field must be passed in the extra_params. The rotator_angle is the position of the slit in degrees east of north. When defining multiple InstrumentConfigs within a Configuration, the same rotator mode must be set in every InstrumentConfig.
optical_elements false false The optical elements to use for this InstrumentConfig. The fields slit, filter, grating, and/or lamp may be passed in here, depending on the available optical elements for the instrument type specified in the parent Configuration.
extra_params false false Extra InstrumentConfig parameters

AcquisitionConfig

A sample acquisition configuration returned via the API:

{
    "mode": "BRIGHTEST",
    "extra_params": {
      "acquire_radius": 5.0    
    }
}

An AcquisitionConfig defines how to configure acquisition for a Configuration.

Field Read Only Required Options Description
mode false false WCS, BRIGHTEST, MANUAL The method for positioning the slit if there is a slit. If BRIGHTEST is selected, the slit is placed on the brightest object near the target coordinates, and acquire_radius, which is the radius in arcseconds in which to search for the brightest object, must be set in the extra parameters. This field will default to the instrument default if not set.
extra_params false false Extra AcquisitionConfig parameters.

GuidingConfig

A sample guiding configuration returned via the API:

{
    "mode": "ON",
    "optional": true,
    "extra_params": {}
}

A GuidingConfig defines how to configure guiding for a Configuration.

Guiding keeps the field stable during long exposures. If the mode is set to ON and optional is set to true, guiding is attempted but the observations are carried out even if guiding fails. If the mode is set to ON and optional is set to false, observations are aborted if guiding fails. Guiding is not attempted if the mode is set to OFF.

For more information on guiding, you can look though the “Getting Started” guide linked here.

Field Read Only Required Options Description
mode false false ON, OFF Guiding mode.
optional false false true, false Whether guiding is optional.
extra_params false false Extra GuidingConfig parameters.

Constraints

A sample Constraints returned via the API:

{
    "max_airmass": 1.6,
    "min_lunar_distance": 30.0,
}

Constraints define conditions that must be met in order to schedule the observation.

Field Read Only Required Description
max_airmass false false Maximum acceptable airmass. The airmass=1 at zenith and increases with zenith distance. Assumes a plane-parallel atmosphere. Defaults to 1.6. You can read about the considerations of setting the airmass limit here.
min_lunar_distance false false Minimum acceptable angular separation between the target and the moon, in decimal degrees. Defaults to 30.

Target

A Target describes what will be observed during an observation and can be sidereal or non-sidereal. Sidereal targets are specified using right ascension and declination. Non-sidereal targets are specified using orbital elements. The following fields are common to both sidereal and non-sidereal targets.

Field Read Only Required Options Description
type false true ICRS, ORBITAL_ELEMENTS Type of Target.
name false true The name of this Target.

A sample sidereal Target returned via the API:

{
    "type": "ICRS",
    "name": "m42",
    "ra": 83.8220792,
    "dec": -5.3911111,
    "proper_motion_ra": 1.67,
    "proper_motion_dec": -0.3,
    "parallax": 0.0,
    "epoch": 2000.0
}

Sidereal Targets

Sidereal targets are used to observe targets that appear to move at or near the sidereal rate, and have the following additional fields.

Field Read Only Required Options Description
ra false true Right ascension in decimal degrees.
dec false true Declination in decimal degrees.
epoch false false In modified Julian days (MJD). Defaults to 2000.
proper_motion_ra true false Right ascension proper motion ±33 mas/year. Defaults to 0, max 20000.
proper_motion_dec true false Declination proper motion ±33 mas/year. Defaults to 0, max 20000.
parallax false false ±0.45 mas, max 2000. Defaults to 0.

Non Sidereal Targets

Non-sidereal targets are used to observe objects that can be described using various orbital element schemes. Two schemes are available: MPC_MINOR_PLANET and MPC_COMET, each of whose associated fields are described as follows.

A sample non sidereal target returned via API:

{
    "name": "Doomsday Asteroid",
    "type": "ORBITAL_ELEMENTS",
    "epochofel": 50000,
    "scheme": "MPC_MINOR_PLANET",
    "orbinc": 0,
    "longascnode": 0,
    "argofperih": 0,
    "meandist": 0,
    "eccentricity": 0,
    "meananom": 0
}

MPC_MINOR_PLANET

Field Read Only Required Options Description
scheme false true MPC_MINOR_PLANET The target scheme to use, in this case MPC_MINOR_PLANET.
epochofel false true The epoch of the orbital elements in MJD.
orbinc false true Orbital inclination (angle in degrees).
longascnode false true Longitude of ascending node (angle in degrees).
argofperih false true Argument of perihelion (angle in degrees).
eccentricity false true Eccentricity ranges from 0 to 0.99.
meananom false true Mean anomaly (angle in degrees).
meandist false true Mean distance (au).

MPC_COMET

Field Read Only Required Options Description
scheme false true MPC_COMET The target scheme to use, in this case MPC_COMET.
epochofel false true The epoch of the orbital elements in MJD.
orbinc false true Orbital inclination (angle in degrees).
longascnode false true Longitude of ascending node (angle in degrees).
argofperih false true Argument of perihelion (angle in degrees).
eccentricity false true Eccentricity ranges from 0 to 0.99.
perihdist false true Perihelion distance (au).
epochofperih false true Epoch of perihelion in MJD.

Migration from V2

The release of V3 of the observing portal API brings with it some backwards incompatible API changes. Those changes are listed here.

Data format definition changes

Authentication

requests.post(
    'https://observe.lco.global/api/api-token-auth/',
    data = {
        'username': 'bilbo@lco.global',
        'password': 'myprecious'
    }
).json()

$.ajax({
    url: 'https://observe.lco.global/api/api-token-auth/',
    type: 'post',
    data: {username: 'bilbo', password: 'myprecious'},
    dataType: 'json',
    success: function(data){
        console.log(data.token)
    }
});

Returns the response:

{ "token": "3d46d6b98edef947402e032e73eca7b54661c666" }

The returned token must be set in the Authorization header for all API requests.

requests.get('https://observe.lco.global/api', headers={'Authorization': 'Token <token>'})

$.ajax({
    url: 'https://observe.lco.global/api',
    headers: {'Authorization': 'Token <token>'}
})

All authenticated endpoints require the use of an API token. Once a token is obtained, it must be sent in the Authorization header for each API request:

Authorization: Token <token>

This header must be set for each API request. See the opposite panel for examples on how this may be accomplished.

You may obtain your API token on your profile page.

You may also obtain a token using the api-token-auth endpoint:

Http Request

POST https://observe.lco.global/api/api-token-auth/

Query Parameters

Parameter Required Default Description
username true Account username.
password true Account password.

Submit RequestGroup

requests.post(
    'https://observe.lco.global/api/requestgroups/',
     json={
        'name': 'Submit me',
        'proposal': 'Test Proposal',
        'ipp_value': 1.05,
        'operator': 'SINGLE',
        'observation_type': 'NORMAL',
        'requests': [...]
    }
).json()

$.ajax({
    url: 'https://observe.lco.global/api/requestgroups/',
    type: 'post',
    data: {
        'name': 'Submit me',
        'proposal': 'Test Proposal',
        'ipp_value': 1.05,
        'operator': 'SINGLE',
        'observation_type': 'NORMAL',
        'requests': [...]
    },
    dataType: 'json',
    success: function(data){
      console.log(data);
    }
});

Returns the response:

{
    "id": 12345,
    "name": "Submit me",
    "proposal": "Test Proposal",
    "ipp_value": 1.05,
    "operator": "SINGLE",
    "observation_type": "NORMAL",
    "state": "PENDING",
    "requests": [...]
}

Authentication Required

Submit a RequestGroup to be observed. Please refer to the introduction for date formatting help.

Http Request

POST https://observe.lco.global/api/requestgroups/

Query Parameters

Parameter Required Default Description
* true A well formed RequestGroup in JSON format.

Get All RequestGroups

Authentication Required

Returns a list of RequestGroups submitted under proposals of which you are a member. Please refer to the introduction for date formatting help.

requests.get('https://observe.lco.global/api/requestgroups/?state=PENDING&user=austin_riba').json()

$.getJSON('https://observe.lco.global/api/requestgroups/?state=PENDING&user=austin_riba')

Returns the response:

{
    "count": 18,
    "next": null,
    "previous": null,
    "results": [
        {
            "id": 4,
            "requests": [...],
            "submitter": "austin_riba",
            "name": "testhis",
            "observation_type": "NORMAL",
            "operator": "SINGLE",
            "ipp_value": 1.05,
            "state": "PENDING",
            "proposal": "LCOEngineering"
        }
    ]
}

Http Request

GET https://observe.lco.global/api/requestgroups/

Query Parameters

Parameter Required Default Options Description
created_after false Result includes RequestGroups created after the given date.
created_before false Result includes RequestGroups created before the given date.
state false PENDING, CANCELED, COMPLETED, WINDOW_EXPIRED Result includes RequestGroups matching the given state.
name false Result includes RequestGroups with a name that contains or matches the given value.
user false Result includes RequestGroups submitted by users whose usernames contain the given value.
proposal false Result includes RequestGroups submitted under the specified proposal.
observation_type false NORMAL, RAPID_RESPONSE, TIME_CRITICAL Results include RequestGroups with the specified observation type.
ipp_value false Results include RequestGroups with the specified IPP value.
ordering false -id Order results by a specific field e.g. modified. Prefix with - for descending order.

Get Single RequestGroup

Authentication Required

Returns a single instance of a RequestGroup.

requests.get('https://observe.lco.global/api/requestgroups/3456/').json()

$.getJSON('https://observe.lco.global/api/requestgroups/3456/')

Returns the response:

{
    "id": 3456,
    "requests": [...],
    "submitter": "austin_riba",
    "name": "testhis",
    "observation_type": "NORMAL",
    "operator": "SINGLE",
    "ipp_value": 1.05,
    "state": "PENDING",
    "proposal": "LCOEngineering"
}

Http Request

GET https://observe.lco.global/api/requestgroups/<id>/

Query Parameters

Parameter Required Default Description
id true The id of the RequestGroup.

Cancel RequestGroup

Authentication Required

RequestGroups can not be deleted, however they can be canceled. Once canceled, a RequestGroup is no longer considered for scheduling.

requests.post('https://observe.lco.global/api/requestgroups/3456/cancel/').json()

$.ajax({
    url: 'https://observe.lco.global/api/requestgroups/3456/cancel/',
    type: 'post',
    success: function(data){
        console.log(data)
    }
});

Returns the response:

{
    "id": 3456
    ...
    "state": "CANCELED"
}

Http Request

POST https://observe.lco.global/api/requestgroups/<id>/cancel/

Query Parameters

Parameter Required Default Description
id true The id of the RequestGroup.

Validate a RequestGroup

requests.post(
    'https://observe.lco.global/api/requestgroups/validate/',
    json={
        'name': 'Validate me',
        'proposal': 'Test Proposal',
        'requests': [...]
    }
).json()

$.ajax({
    url: 'https://observe.lco.global/api/requestgroups/validate/',
    type: 'post',
    data: {
        "name": "Validate me",
        "proposal": "Test Proposal",
        "requests": [...]
    },
    dataType: 'json',
    success: function(data){
      console.log(data);
    }
});

Returns the response:

{
    "request_durations": {},
    "errors": {
        "requests": [...]
}

Authentication Required

This endpoint is used to check if a RequestGroup is valid before submission. The response contains the duration of the each Request which is debited from the proposal’s allocated time upon completion. Please refer to the introduction for date formatting help.

Http Request

POST https://observe.lco.global/api/requestgroups/validate/

Query Parameters

Parameter Required Default Description
* true A well formed RequestGroup in JSON format.

Get Max Allowable IPP

requests.post(
    'https://observe.lco.global/api/requestgroups/max_allowable_ipp/',
    json={
        "name": "Check Ipp",
        "proposal": "Test Proposal",
        "requests": [...]
    }
).json()

$.ajax({
    url: 'https://observe.lco.global/api/requestgroups/max_allowable_ipp/',
    type: 'post',
    data: {
        "name": "Check Ipp",
        "proposal": "Test Proposal",
        "requests": [...]
    },
    dataType: 'json',
    success: function(data){
      console.log(data);
    }
});

Returns the result:

{
    "2016B": {
        "1m0": {
            "1M0-SCICAM-SINISTRO": {
                "ipp_time_available": 1.0,
                "ipp_limit": 10.0,
                "request_duration": 1.54,
                "max_allowable_ipp_value": 1.649,
                "min_allowable_ipp_value": 0.5
            }
        }
    }
}

Authentication Required

Returns miscellaneous information pertaining to IPP per semester and telescope class. Please refer to the introduction for date formatting help.

HTTP Request

POST https://observe.lco.global/api/requestgroups/max_allowable_ipp/

Query Parameters

Parameter Required Default Description
* true A well formed RequestGroup in JSON format.

Generate Cadence

requests.post(
    'https://observe.lco.global/api/requestgroups/cadence/',
    json={
        'name': 'generate cadence',
        'proposal': 'Test Proposal',
        'requests': [{
            'cadence': {
                'start': '2016-09-01T21:12:18Z',
                'end': '2016-09-03T22:12:19Z',
                'period': 24.0,
                'jitter': 12.0
            },
            ...
        }]
    }
).json()

$.ajax({
    url: 'https://observe.lco.global/api/requestgroups/cadence/',
    type: 'post',
    data: {
        "name": "generate cadence",
        "proposal": "Test Proposal",
        "requests": [{
            "cadence": {
                "start": "2016-09-01T21:12:18Z",
                "end": "2016-09-03T22:12:19Z",
                "period": 24.0,
                "jitter": 12.0
            },
            ...
        }]
    },
    dataType: 'json',
    success: function(data){
      console.log(data);
    }
});

Returns the response:

{
    "id": 3456
    ...
    "requests":[{
        "windows":[{
            "start": "2016-09-01T21:12:18Z",
            "end": "2016-09-02T03:12:18Z"
        }],
        ...
        },{
        "windows":[{
            "start": "2016-09-02T15:12:18Z",
            "end": "2016-09-03T03:12:18Z"
        }],
        ...
    }]
}

Authentication Required

Given a well formed RequestGroup containing a single Request that has a cadence key, this endpoint returns a new RequestGroup with multiple Requests generated by the cadence function. Please refer to the introduction for date formatting help.

HTTP Request

POST https://observe.lco.global/api/requestgroups/cadence/

Query Parameters

Parameter Required Default Description
* true A well formed RequestGroup in JSON format containing a single Request with a cadence key.
start true The UTC date that marks the beginning of the window in which to generate the cadenced Requests.
end true The UTC date that marks the end of the window in which to generate the cadenced Requests.
period true The fractional hours between observations. A 24 hour window with a period of 6 hours should have 3-4 Requests created within it (if they are all visible).
jitter true The fractional hours +/- of each Request window. A 24 hour window with a period of 6 hours and a jitter of 3 hours will create Requests with Windows centered every 6 hours, with their start and end times +/- 1.5 hours from those centers.

Airmass

requests.get('https://observe.lco.global/api/requests/12345/airmass/').json()

$.getJSON('https://observe.lco.global/api/requests/12345/airmass/')

Returns the response:

{
    "airmass_data": {
        "cpt": {
            "times": [
                "2017-03-10T00:00",
                "2017-03-10T00:10",
                "2017-03-10T00:20",
            ],
            "airmasses": [
                1.1742551260332688,
                1.1956410351734084,
                1.2190628569952935,
            ]
        },
        "lsc": {
            "times": [
                "2017-03-10T00:00",
                "2017-03-10T00:10",
                "2017-03-10T00:20",
            ],
            "airmasses": [
                1.4136946116338753,
                1.374117740986236,
                1.3379014027310017,
            ]
        }
    },
    "airmass_limit": 2.0
}

Authentication Required

For a specific Request, return the airmasses of the Target in the first Configuration from the sites for which it is visible in 10 minute intervals. The max_airmass in the first Configuration’s Constraints is used to determine visibility from a site.

HTTP Request

GET https://observe.lco.global/api/requests/<id>/airmass/

Query Parameters

Parameter Required Default Description
id true The id of the Request.

Code Samples

Observation API Examples

This is a collection of scripts that demonstrate various functions of the API.

View on Github

Proposals

Api root: https://observe.lco.global/api/proposals

The proposals API provides endpoints for retrieving information pertaining to proposals such as time used, time allocated, principal investigators (PIs), co-investigators (CoIs), etc.

Migration from V2 to V3 of the Observations API

Note that there have been slight changes to time allocations with this change of the API. The TARGET_OF_OPPORTUNITY (TOO) type of time has been renamed to RAPID_RESPONSE (RR), and a TIME_CRITICAL (TC) type time has been added. In addition, within a timeallocation, the telescope_class field has been removed and the instrument_name field has been renamed to instrument_type.

Proposal Definition

A sample Proposal returned via API:

    {
        "id": "LCOTest-001",
        "timeallocation_set": [
            {
                "std_allocation": 25.0,
                "std_time_used": 14.3253,
                "ipp_limit": 0.0,
                "ipp_time_available": 0.0,
                "rr_allocation": 0.0,
                "rr_time_used": 0.0,
                "tc_allocation": 0.0,
                "tc_time_used": 0.0,
                "instrument_type": "1M0-SCICAM-SINISTRO",
                "semester": "2017AB",
                "proposal": "LCOTest-001"
            }
        ],
        "users": {
            "isaac_newton":{
                "first_name": "Issac",
                "last_name": "Newton",
                "time_limit": 3600
            },
            "ggalileo@lco.global":{
                "first_name": "Galileo",
                "last_name": "Galilei",
                "time_limit": -1,
            }
        },
        "pi": "isaac_newton",
        "active": false,
        "title": "Study fun things",
        "abstract": "This work is to ...",
        "tac_priority": 1000,
        "tac_rank": 0,
        "public": false,
        "tag": "LCO"
    }
Field Description
id The id of this Proposal.
timeallocation_set Time allocation information associated with this Proposal.
users The set of users (PIs and CoIs) associated with this Proposal and their associated time information (in seconds).
pi The PI for this Proposal.
active Boolean field indicating whether UserRequests can currently be submitted with this Proposal.
title The title of the Proposal.
abstract The abstract of the Proposal.
tac_priority The priority of the Proposal as awarded by the TAC.
tac_rank The numerical ranking given to the Proposal by the TAC.
tag The group of which this Proposal is a part.

Authentication

Authentication for the proposals API is exactly the same as the Observations API.

Get all Proposals

requests.get('https://observe.lco.global/api/proposals/')

$.getJSON('https://observe.lco.global/api/proposals/')

Returns the response:

{
    "count": 2,
    "next": null,
    "previous": null,
    "results": [
        {
            "id": "LCOEPO1",
            "timeallocation_set": [
                {
                    "std_allocation": 15.0,
                    "std_time_used": 4.754,
                    "ipp_limit": 1.5,
                    "ipp_time_available": 0.75,
                    "rr_allocation": 0.0,
                    "rr_time_used": 0.0,
                    "tc_allocation": 0.0,
                    "tc_time_used": 0.0,
                    "instrument_type": "1M0-SCICAM-SINISTRO",
                    "semester": "2016A",
                    "proposal": "WhiteFuzzies"
                },
            ],
            "users": [
                "bilbo@baggins.com",
                "darth.vader@empire.uk",
                "mario@plumbers.com"
            ],
            "pi": "darth.vader@empire.uk",
            "active": true,
            "title": "Observations of Stuff in the Sky",
            "abstract": "We want pretty pictures",
            "tac_priority": 1,
            "tac_rank": 1,
            "public": false,
            "tag": "LCO"
        },
        {
            "id": "LCOEPO2",
            "timeallocation_set": [
                {
                    "std_allocation": 63.0,
                    "std_time_used": 21.0,
                    "ipp_limit": 0.0,
                    "ipp_time_available": 0.0,
                    "rr_allocation": 2.0,
                    "rr_time_used": 0.0,
                    "tc_allocation": 2.0,
                    "tc_time_used": 0.0,
                    "instrument_type": "1M0-SCICAM-SINISTRO",
                    "semester": "2014B",
                    "proposal": "LCOEPO2"
                }
            ],
            "users": {
                "steve.pete@downhill.eu":{
                    "first_name": "Steve",
                    "last_name": "Pete",
                    "time_limit": 240,
                },
                "aaron.gwin@fast.com":{
                    "first_name": "Aaron",
                    "last_name": "Gwin",
                    "time_limit": 3400,
                }
            },
            "pi": "aaron.gwin@fast.com",
            "active": false,
            "title": "Observing Mars",
            "abstract": "Mars observations",
            "tac_priority": 2,
            "tac_rank": 2,
            "public": false,
            "tag": "LCO"
        },
    ]
}

Authentication Required

Returns a list of Proposals that belong to the authenticated user. Time allocation information contains the observing time in hours granted to a proposal for a single semester and instrument type.

HTTP Request

GET https://observe.lco.global/api/proposals/

Query Parameters

See Proposal Definition for parameters

Get Single Proposal

requests.get('https://observe.lco.global/api/proposals/LCOEPO1/')

$.getJSON('https://observe.lco.global/api/proposals/LCOEPO1/')

Returns the response:

 {
    "id": "LCOEPO1",
    "timeallocation_set": [
        {
            "std_allocation": 15.0,
            "std_time_used": 4.754,
            "ipp_limit": 1.5,
            "ipp_time_available": 0.75,
            "rr_allocation": 0.0,
            "rr_time_used": 0.0,
            "tc_allocation": 0.0,
            "tc_time_used": 0.0,            
            "instrument_type": "1M0-SCICAM-SINISTRO",
            "semester": "2016A",
            "proposal": "WhiteFuzzies"
        },
    ],
    "users": {
        "bilbo@baggins.com": {
            "first_name": "Bilbo",
            "last_name": "Baggins",
            "time_limit": 454,
        },
        "darth.vader@empire.uk": {
            "first_name": "Anakin",
            "last_name": "Skywalker",
            "time_limit": 2100,
        }
    },
    "pi": "darth.vader@empire.uk",
    "active": true,
    "title": "Observations of Stuff in the Sky",
    "abstract": "We want pretty pictures",
    "tac_priority": 1,
    "tac_rank": 1,
    "public": false,
    "tag": "LCO"
}

Authentication Required

Return information on a single Proposal.

HTTP Request

GET https://observe.lco.global/api/proposals/<id>/

Query Parameters

Parameter Required Default Description
id true The id of the Proposal.

Semesters

LCO organizes time into Semesters which are not all of uniform length. This API provides a convenient way to see when semesters start and end.

Semesters Definition

Field Description
id The id of this Semester.
start The start time of the Semester.
end The end time of the Semester.

API root: https://observe.lco.global/api/semesters/

Get All Semesters

requests.get('https://observe.lco.global/api/semesters/').json()

$.getJSON('https://observe.lco.global/api/semesters/')

Returns the response:

{
    "count": 9,
    "next": null,
    "previous": null,
    "results": [
        {
            "id": "2016B",
            "start": "2016-10-01T00:00:00Z",
            "end": "2017-03-31T23:59:59Z"
        },
        {
            "id": "2016A",
            "start": "2016-04-01T00:00:00Z",
            "end": "2016-09-30T23:59:59Z"
        },
        ...
    ]
}

Requesting the semester that contains the date 4-10-2017:

requests.get('https://observe.lco.global/api/semesters/?semester_contains=2017-04-10').json()

$.getJSON('https://observe.lco.global/api/semesters/?semester_contains=2017-04-10')

Returns the response:

{
    "count": 1,
    "next": null,
    "previous": null,
    "results": [
        {
            "id": "2017AB",
            "start": "2017-04-01T00:00:00Z",
            "end": "2017-11-30T23:59:59Z"
        }
    ]
}

Returns a list of all Semesters. Please refer to the introduction for date formatting help.

HTTP Request

GET https://observe.lco.global/api/semesters/

Query Parameters

Parameter Required Default Description
id false The id of the Semester.
semester_contains false Result is the a single Semester that contains the given date.
start false Get only Semesters that start on or after this date.
end false Get only Semesters that end on or before this date.

Get Single Semester

requests.get('https://observe.lco.global/api/semesters/2016B/')

$.getJSON('https://observe.lco.global/api/semesters/2016B/')

Returns the response:

{
    "id": "2016B",
    "start": "2016-10-01T00:00:00Z",
    "end": "2017-03-31T23:59:59Z"
}

Return a single Semester.

HTTP Request

GET https://observe.lco.global/api/semesters/<id>/

Query Parameters

Parameter Required Default Description
id true The id of the Semester.

Telescope States

Get Telescope States

requests.get('https://observe.lco.global/api/telescope_states/?start=2017-03-23&end=2017-03-24&site=lsc&site=coj&telescope=1m0a').json()

$.getJSON('https://observe.lco.global/api/telescope_states/?start=2017-03-23&end=2017-03-24&site=lsc&site=coj&telescope=1m0a')

Returns the response:

{
     "lsc.domb.1m0a": [
        {
            "telescope": "lsc.domb.1m0a",
            "event_type": "AVAILABLE",
            "event_reason": "Available for scheduling",
            "start": "2017-03-23T00:00:00Z",
            "end": "2017-03-23T01:27:51Z"
        },
        {
            "telescope": "lsc.domb.1m0a",
            "event_type": "SEQUENCER_DISABLED",
            "event_reason": "Sequencer in MANUAL state",
            "start": "2017-03-23T01:27:51Z",
            "end": "2017-03-23T01:36:38Z"
        },
        ...
    ],
    "lsc.domc.1m0a": [
      ...
    ],
    "coj.domb.1m0a": [
      ...
    ],
    ...
}

Returns the states of telescopes in the LCO network. Please refer to the introduction for date formatting help.

HTTP Request

GET https://observe.lco.global/api/telescope_states/

Query Parameters

Parameter Required Default Description
start false now Start time.
end false now End time.
site false all Sites by which to filter (3-letter site code, e.g. lsc).
telescope false all Telescopes by which to filter (e.g. 1m0a).

Telescope Availability

Get Telescope Availability

requests.get('https://observe.lco.global/api/telescope_availability/?start=2017-03-23&end=2017-03-24&site=lsc&site=ogg').json()

$.getJSON('https://observe.lco.global/api/telescope_availability/?start=2017-03-23&end=2017-03-24&site=lsc&site=ogg')

Returns the response:

{
    "lsc.domb.1m0a": [
        [
            "2017-03-23",
            1.0
        ]
    ],
    "ogg.clma.0m4b": [
        [
            "2017-03-23",
            1.0
        ]
    ]
}

Returns the percentage that telescopes were available over the given time range. Please refer to the introduction for date formatting help.

HTTP Request

GET https://observe.lco.global/api/telescope_availability/

Query Parameters

Parameter Required Default Description
start false 24 hours ago Start time.
end false now End time.
site false all Sites by which to filter (3-letter site code, e.g. lsc).
telescope false all Telescopes by which to filter by (e.g. 1m0a).

Archive

Api Root: https://archive-api.lco.global

The archive API is a web service which provides a RESTful interface to the data stored in the archive.

To access it, use any library or program which can understand HTTP: for example, a web browser. Visiting https://archive-api.lco.global in your browser will take you to the browseable API. Here you can explore the various endpoints available, craft queries and view the JSON that will be returned. The exact URLs you visit in the browseable API can be used to return JSON to other programs, so it is a useful tool to explore the API.

The API can also be accessed using a variety of programmatic interfaces, such as curl:

curl https://archive-api.lco.global/frames/ > results.json

Which will get the metadata for the last 100 data products in the archive, and store that information in results.json

Rate Limits

The archive API is rate limited so that it remains available to all users in the event a single user makes too many requests in too rapid a succession, causing denial of service to other clients.

All logged in users are limited to 5,000 HTTP calls in a 24 hour period. Anonymous users are limited to 3,500 calls in a 24 hour period.

Archive calls have a maximum limit parameter of 1000 to prevent slow queries. You can paginate through your result set using the offset field to retrieve more than the max limit.

Authentication

requests.post(
    'https://archive-api.lco.global/api-token-auth/',
    data = {
        'username': 'bilbo@lco.global',
        'password': 'myprecious'
    }
).json()

$.ajax({
    url: 'https://archive-api.lco.global/api-token-auth/',
    type: 'post',
    data: {username: 'bilbo', password: 'myprecious'},
    dataType: 'json',
    success: function(data){
        console.log(data.token)
    }
});

Returns the response:

{ "token": "3d46d6b98edef947402e032e73eca7b54661c666" }

The returned token must be set in the Authorization header for all api requests.

requests.get('https://archive-api.lco.global/frames/', headers={'Authorization': 'Token <token>'})

$.ajax({
    url: 'https://archive-api.lco.global/frames/',
    headers: {'Authorization': 'Token <token>'}
})

The archive API is authenticated and will only return results the user is authorized to view. For a non logged in user, this is all public data. For a logged in user, this is public data and data which belongs to proposals that the user is a part of.

A user can authenticate by posting a username and password to the /api-token-auth/ endpoint which will return an API token. The token must then be placed in the Authorization header of subsequent requests in the the following form:

Token <token>

An example of obtaining a token using curl:

curl --data "username=bilbo@lco.global&password=myprecious" https://archive-api.lco.global/api-token-auth/

returns:

{"token":"3d46d6b98edef947402e032e73eca7b54661c968"}

The token can now be used in resulting requests:

curl --header "Authorization: Token 3d46d6b98edef947402e032e73eca7b54661c968" https://archive-api.lco.global/frames/

Data Format Definition

A sample frame returned via API:

{
    "id": 42120,
    "basename": "ogg2m001-fs02-20160202-0133-e91",
    "area": {
        "type": "Polygon",
        "coordinates": [
            [
                [
                    135.12548613998868,
                    36.53399918890214
                ],
                [
                    135.12571388933247,
                    36.701867589076244
                ],
                [
                    134.91633784602044,
                    36.70186763472167
                ],
                [
                    134.91656548197224,
                    36.53399923426909
                ],
                [
                    135.12548613998868,
                    36.53399918890214
                ]
            ]
        ]
    },
    "related_frames": [
        1375,
        42119,
        42078,
        42040,
        42039
    ],
    "version_set": [
        {
            "id": 44713,
            "created": "2016-02-03T22:27:59.236409Z",
            "key": "dtxW9DM0lwKNpsPYlnhEzDt41OCp7q0i",
            "md5": "e1836a49b573ac50ccddba7e54661564",
            "extension": ".fits",
            "url": "https://lcogtarchivetest.s3.amazonaws.com/44f2/ogg2m001-fs02-20160202-0133-e90?versionId=dtxW9DM0lwKNpsPYlnhEzDt41OCp7q0i&Expires=1454542848&AWSAccessKeyId=AKIAIZBYNSZZGYN3EAQQ&Signature=T3XtzW8bTYqI48haJZFvEMdqb6M%3D"
        }
    ],
    "url": "https://lcogtarchivetest.s3.amazonaws.com/44f2/ogg2m001-fs02-20160202-0133-e90?versionId=dtxW9DM0lwKNpsPYlnhEzDt41OCp7q0i&Expires=1454542848&AWSAccessKeyId=AKIAIZBYNSZZGYN3EAQQ&Signature=T3XtzW8bTYqI48haJZFvEMdqb6M%3D",
    "filename": "ogg2m001-fs02-20160202-0133-e90.fits",
    "RLEVEL": 91,
    "DATE_OBS": "2016-02-03T09:05:57.414000Z",
    "PROPID": "FTPEPO2014A-003",
    "INSTRUME": "fs02",
    "OBJECT": "P 2010 v1",
    "SITEID": "ogg",
    "TELID": "2m0a",
    "EXPTIME": "60.000",
    "FILTER": "R",
    "L1PUBDAT": "2016-02-03T09:05:57Z",
    "OBSTYPE": "EXPOSE",
    "BLKUID": 54321,
    "REQNUM": 12345
}

The archive endpoints return metadata formatted in json. An example of a typical entry corresponding to a single data product is given on the right.

Much of the meta-data matches values from the file’s FITS headers:

Field Description
DATE_OBS The UTC time at the start of exposure.
PROPID The name of the proposal for which this frame was taken.
INSTRUME The instrument that produced this frame.
OBJECT The name of the object given by the user as the target of the observation. Note this is not the same as searching by on sky position - the OBJECT header is free-form text which may or may not match the actual contents of the file.
SITEID The site that produced this frame.
TELID The telescope that produced this frame.
EXPTIME The exposure time of the frame.
FILTER The filter used to produce this frame.
L1PUBDAT The date this frame become public.
OBSTYPE The type of exposure: EXPOSE, BIAS, SPECTRUM, CATALOG, etc.
BLKUID The Observation ID of the frame
REQNUM The Request number of the frame
RLEVEL The reduction level of the frame. Currently, there are 3 reduction levels: Some of the meta-data fields are derived and not found in the FITS headers. 0 (Raw), 11 (Quicklook), 91 (Final reduced).
Field Description
id is the ID of the frame.
filename is the filename.
basename is the base of the filename without a file extension.
area is a WKT Polygon which represents the frame’s coverage of the sky. Each point in the polygon is a RA Dec pair in degrees.
related_frames is a list of ids of other frames that are related to this one. These can include calibration files, catalog files, final data products, etc.
version_set is a list of versions for this frame. Each version contains a url to download the file, a file extension, an md5 checksum, and a datetime.
url is the URL to download the frame, from the latest version.

Aggregate

requests.get('https://archive-api.lco.global/frames/aggregate/?SITEID=ogg&OBSTYPE=SKYFLAT&start=2019-09-01&end=2019-09-02').json()

$.getJSON('https://archive-api.lco.global/frames/aggregate/?SITEID=ogg&OBSTYPE=SKYFLAT&start=2019-09-01&end=2019-09-02')

Returns the response:

{
    "sites": [
        "ogg"
    ],
    "telescopes": [
        "0m4b",
        "0m4c",
        "2m0a"
    ],
    "filters": [
        "gp",
        "ip",
        "rp",
        "up",
        "V",
        "w",
        "Y"
    ],
    "instruments": [
        "fs02",
        "kb27",
        "kb82"
    ],
    "obstypes": [
        "SKYFLAT"
    ],
    "proposals": [
        "calibrate"
    ]
}

Returns the unique values shared across all fits files for site, telescope, instrument, filter, proposal, and obstype. Only proposals for which public data exists are included in the results.

HTTP Request

GET https://archive-api.lco.global/frames/aggregate/

Query Parameters

All parameters are optional. If parameters are supplied, unique values are determined from frames filtered by those parameters.

Parameter Type Description
PROPID string Unique values for frames which belong to this proposal
SITEID string Unique values for frames produced at this site
TELID string Unique values for frames produced from this telescope
FILTER string Unique values for frames produced using this filter
OBSTYPE string Unique values for frames which match this OBSTYPE
INSTRUME string Unique values for frames taken with this instrument
start datetime Unique values for frames with a DATE-OBS later than or equal to this date
end datetime Unique values for frames with a DATE-OBS earlier than or equal to this date

List Frames

requests.get('https://archive-api.lco.global/frames/').json()

$.getJSON('https://archive-api.lco.global/frames/')

Returns the response:

{
  "count": 9000,
  "next": "https://archive-api.lco.global/frames/?limit=100&offset=100",
  "previous": null,
  "results": [
    {
      ... Frame Payload ...
    }
  ]
}

Return a list of frames. Please refer to the introduction for date formatting help.

HTTP Request

GET https://archive-api.lco.global/frames/

Query Parameters

All parameters are optional

Parameter Type Description
basename string Frames which contain this value in their basename
DATE_OBS datetime Frames taken exactly on this date
PROPID string Frames which belong to this proposal
REQNUM integer Frames which belong to this Request
BLKUID integer Frames which belong to this observation ID
SITEID string Frames produced at this site
TELID string Frames produced from this telescope
FILTER string Frames produced using this filter
OBSTYPE string Frames which match this OBSTYPE
INSTRUME string Frames taken with this instrument
OBJECT string Frames which contain this value in their OBJECT header
start datetime Frames with a DATE-OBS later than this date
end datetime Frames with a DATE-OBS earlier than this date
public boolean Frames that are public. Default: true
RLEVEL integer Frames at this reduction level
EXPTIME integer Frames where the exposure time is greater than or equal to this value, in seconds
L1PUBDAT datetime Frames that go public on this date
covers POINT Frames which cover this specific point.
intersects POINT Frames which intersect with this specific point.

Note about the POINT datatype: The value is a WKT point of RA and DEC in degrees. Example /frames/?covers=POINT(34.4 -20.9)

Get Single Frame

requests.get('https://archive-api.lco.global/frames/42/').json()

$.getJSON('https://archive-api.lco.global/frames/42/')

Returns the response:

{
    "id": 32,
  ... frame payload ...
}

Returns details about a specific frame.

HTTP Request

GET https://archive-api.lco.global/frames/<id>/

Query Params:

Parameter Type Description
id integer The id of this frame 
requests.get('https://archive-api.lco.global/frames/42/related/').json()

$.getJSON('https://archive-api.lco.global/frames/42/related/')

Returns the response:

[
  {
    ... List of frames ...
  }
]

Returns calibration, raw/reduced frames associated with this frame.

HTTP Request

GET https://archive-api.lco.global/frames/<id>/related/

Query Params:

Parameter Type Description
id integer The id of this frame

Get Headers

requests.get('https://archive-api.lco.global/frames/42/headers/').json()

$.getJSON('https://archive-api.lco.global/frames/42/headers/')

Returns the response:

{
    "data": {
        "AZIMUTH": 180.3819459,
        "OBSGEO_Y": -5213920.079,
        "M1COVER": "DEPLOYED",
        "SCHEDSEE": "",
        "FOCOBOFF": 0.0,
        "FILTER1": "air",
        "NAXIS2": 4096,
        ...
    }
}

Retrieve the FITS headers for this frame.

HTTP Request

GET https://archive-api.lco.global/frames/<id>/headers/

Query Params:

Parameter Type Description
id integer The id of this frame

Profile

requests.get('https://archive-api.lco.global/profile/').json()

$.getJSON('https://archive-api.lco.global/profile/')

Returns the response:

{
  "username": "bilbo@lco.global",
  "profile": {
    "proposals": [
      "FellowshipProposal",
      "Hobbits2015A",
      "Quests"
    ]
  }
}

Returns details about the currently authenticated user.

HTTP Request

GET https://archive-api.lco.global/profile/

Query Params:

None

Code Samples

Iterate over multiple pages of results

frame_collection = []

def fetch_frames(url, collection):
    response = requests.get(url).json()
    collection += response['results']
    if response.get('next'):
        fetch_frames(response['next'], collection)

fetch_frames('https://archive-api.lco.global/frames/?OBJECT=m42', frame_collection)
print(len(frame_collection))
... 1024 ...

lcogtDD

Nestor Espinoza has written a command line script to download files from the LCO archive.

View on Github

Thumbservice

The Thumbnail API is a flask script which takes advantage of the LCO Archive API.

View on Github

Download 24 hours of data from a single proposal

proposal = 'FellowshipProposal'
response = requests.get(
  'https://archive-api.lco.global/frames/?start=2016-1-1&end=2016-1-2&PROPID=' + proposal,
  headers=headers
).json()

frames = response['results']
for frame in frames:
  with open(frame['filename'], 'wb') as f:
    f.write(requests.get(frame['url']).content)

Search by RA and Dec

response = requests.get(
  'https://archive-api.lco.global/frames/?covers=POINT(112.3 20.9)',
  headers=headers
).json()

frames = response['results']
for frame in frames:
  print(frame['filename'])
  ... "ogg2m001-fs02-20160202-0167-e10.fits", "ogg2m001-fs02-20160202-0166-e10.fits" ...

Download a frame’s related files

response = requests.get(
  'https://archive-api.lco.global/frames/39728/related/',
  headers=headers
).json()
frames = response['results']
for frame in frames:
  with open(frame['filename'], 'wb') as f:
    f.write(requests.get(frame['url']).content)

Thumbnails

API Root: https://thumbnails.lco.global

The thumbnail service provides a simple api to generate images from data stored on the archive. This api is useful for creating interfaces or education material.

Authentication

The thumbnail api passes through the value of the Authorization HTTP header through to the archive api. For proprietary data it is necessary to provide this header, public data needs no authentication. Thus, to authenticate with the thumnail api, you must first obtain an authentication key from the archive api. Then make requests to the thumbnail api, using the Authorization header as you would on the archive.

Generate Thumbnail

requests.get('https://thumbnails.lco.global'/<frame_id>/').json()

$.getJSON('https://thumbnails.lco.global/<frame_id>/')

Returns the response:

{

    "propid": "FTPEPO2014A-003",
    "url": "https://s3-us-west-2.amazonaws.com/thumbnails.lcogt.net/6124256.4163566684581698428.jpg?AWSAccessKeyId=AKIAIIXJI2IT23CSF2RA&Expires=1493352936&Signature=x%2B5b8ZHZTW850dVVx%2ByyYiLIGbY%3D"

}

Generates a thumbnail from the frame identified by frame_id. The url to the jpg will be returned in the url key of the response.

To obtain the frame id, use the archive api.

HTTP Request

GET https://thumbnails.lco.global/<frame_id>/

Query Parameters

Parameter Required Description
frame_id true The id of the frame to be thumbnailed
width false The width (in pixels) of the generated image
label false Place text on the thumbnail
color false Generate a color image. note: this only works for frames where there are R,V and B filter versions of the same observation.

Pressure

Get Network Pressure

requests.get('https://observe.lco.global/api/pressure/?site=lsc').json()

$.getJSON('https://observe.lco.global/api/pressure/?site=lsc')

Returns the response:

{
    "pressure_data": [
        {},
        {},
        ...
        {
            "All Proposals": 0.00019054754269455878,
        },
        {
            "All Proposals": 0.00019054754269455878,
        },
        {
            "All Proposals": 0.00019054754269455878,
        },
        {
            "All Proposals": 0.00019054754269455878,
        },
        ...
        {},
        {},
    ],
    "time_bins": [
        "2017-05-19T00:50:14.537278Z",
        "2017-05-19T01:05:14.537278Z"
        ...
        "2017-05-20T00:20:14.537278Z",
        "2017-05-20T00:35:14.537278Z"
    ],
    "site_nights": [
        {
            "name": "lsc",
            "start": 2.691666666666667,
            "stop": 14.288055555555555
        }
    ],
    "site": "lsc",
    "instrument_name": "all",
    "time_calculated": "2017-05-19T00:50:14.537278Z"
}

The pressure of a Request is defined as its duration divided by the total length of time for which it is visible. For each time bin, this value is further divided by the number of telescopes from which the Request is visible during that time bin. An overall pressure of 1 means the network is perfectly subscribed on average (> 1 is over-subscription, < 1 is under-subscription).

The returned data structure has the following keys: pressure, time_bins, site_nights, site, instrument_name, and time_calculated.

pressure is an array of 15 minute time buckets whose value is the pressure in that bucket. The first bucket begins now and the last bucket ends 24 hours from now.

time_bins is an array that holds the start time of each bucket.

site_nights shows start and end times of local nights at sites in the next 24 hours, in hours from now.

site is the site for which the pressure data is calculated. This is either ‘all’ or a single site.

instrument_name is the instrument for which the pressure data is calculated. This is either ‘all’ or a specific instrument.

time_calculated is the time at which the pressure was calculated, i.e. now.

HTTP Request

GET https://observe.lco.global/api/pressure/

Query Parameters

Parameter Required Default Description
site false all Set to a 3-letter site code to return pressure for that site only, e.g. ‘lsc’.
instrument false all Set to a specific instrument to show pressure for that instrument only, e.g. ‘1M0-SCICAM-SINISTRO’.

Contention

Get Contention

requests.get('https://observe.lco.global/api/contention/1M0-SCICAM-SINISTRO/').json()

$.getJSON('https://observe.lco.global/api/contention/1M0-SCICAM-SINISTRO/')

Returns the response:

{
    "contention_data": [
        {
            "All Proposals": 0
        },
        {
            "All Proposals": 0
        },
        {
            "All Proposals": 584
        },
        ...
        {
            "All Proposals": 0
        },
        {
            "All Proposals": 4360
        },
        {
            "All Proposals": 16890
        },
    ],
    "ra_hours": [
        0,
        1,
        ...
        22,
        23
    ],
    "instrument_name": "1M0-SCICAM-SINISTRO",
    "time_calculated": "2017-05-19T00:50:14.606194Z"
}

The contention of the network is the total amount of telescope time requested by right ascension (RA) and instrument. Observations requested where contention is high are more likely to incur scheduling conflicts.

The returned data structure contains the keys contention_data, ra_hours, instrument_name, and time_calculated.

contention_data is an array of 1 hour bins in RA where the value of each bin is the contention at that RA in total seconds.

ra_hours is an array of the RAs of each bin.

instrument_name is the instrument for which the contention data is calculated. This is either ‘all’ or a specific instrument.

time_calculated is the time at which the contention data was calculated, i.e. now.

HTTP Request

GET https://observe.lco.global/api/contention//<instrument>/

Query Parameters

Parameter Required Default Description
instrument false all Set to a specific instrument to show contention for that instrument only, e.g. ‘1M0-SCICAM-SINISTRO’.

Weather

Retrieve Weather

API Root: https://weather-api.lco.global

The weather API provides a method for querying the current and historical weather conditions at each site in the LCO network.

The data is returned in 15 minute binned averages over the specified time range. A maximum of 1000 buckets will be returned (about 12 days).

Please refer to the introduction for date formatting help.

requests.get('https://weather-api.lco.global'/query?site=<site>&datumname=<datumname>&start=<start>&end=<end>').json()

$.getJSON('/query?site=<site>&datumname=<datumname>&start=<start>&end=<end>')

Returns the response:

[
    {
        "TimeStamp": "2018/02/25 17:45:00",
        "Value":15.385715
    },{
        "TimeStamp":"2018/02/25 18:00:00",
        "Value":14.831818
    },{
        "TimeStamp":"2018/02/25 18:15:00",
        "Value":15.137931
    },{
        "TimeStamp":"2018/02/25 18:30:00",
        "Value":14.737931
    }
]

Authentication

The weather API does not require authentication.

Available Datums

The following weather datums are available:

Name Description
Weather Air Temperature Value Ambient temperature measured by HMP45C-L temperature probe at the site’s weather station.
Boltwood Sky Minus Ambient Temperature Sky Temperature is inferred from 8-14µm irradiance measured by a Boltwood II cloud sensor at the site’s weather station.
Weather Humidity Value Relative humidity measured by HMP45C-L humidity probe at the site’s weather station.
Weather Barometric Pressure Value Barometric pressure measured by Vaisala PTB110 barometer at the site’s weather station.
Weather Wind Speed Value Wind speed measured by Windsonic1-L wind sensor at the site’s weather station.
Weather Wind Direction Value Wind direction, in degrees East of North, measured by Windsonic1-L wind sensor at the site’s weather station.
Weather Sky Brightness Value Sky brightness, in magnitudes per square arcsecond, measured by Unihedron SQM-LE at the site’s weather station.

HTTP Request

GET https://weather-api.lco.global/query/

Query Parameters

Parameter Required Description
site true The LCO site code
datumname true The datum to retrieve
start false The datetime for the start of the time window. Defaults to 24 hours ago.
end false The datetime for the end of the time window. Defaults to now.
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