ACROSS supports a layered approach to metadata. Observatories have Telescopes which have Instruments.
See documentation for more details.
Observatory Metadata
[NICER] Neutron Star Interior Composition Explorer
dbf57304-fb1c-4d3b-99b1-6a9f6ade05b3
observatory type: SPACE_BASED
url: https://heasarc.gsfc.nasa.gov/docs/nicer/mission_guide/
Observatory Ephemeris Types
{
"ephemeris_type": "tle",
"priority": 1,
"parameters": {
"norad_id": 25544,
"norad_satellite_name": "ISS (ZARYA)"
}
}Telescopes (1)
[NICER] Neutron Star Interior Composition Explorer
8ca37c8a-8fcc-404b-a58d-a9854099c97d
[NICER] Neutron Star Interior Composition Explorer
8ca37c8a-8fcc-404b-a58d-a9854099c97d
Instruments (1)
[XTI] X-ray Timing Instrument
74160b93-b3f5-4d9f-b9c9-c9938784d69c
[XTI] X-ray Timing Instrument
74160b93-b3f5-4d9f-b9c9-c9938784d69c
Filters (1)
NICER XTI
id: f8d2fdce-7831-4545-9d23-40a412483bd6
created_on: 2025-07-17T18:34:46.262273
name: NICER XTI
peak_wavelength: null
min_wavelength: 1.0332016536100035 Å
max_wavelength: 61.992099216600124 Å
is_operational: true
sensitivity_depth_unit: null
sensitivity_depth: null
sensitivity_time_seconds: null
instrument_id: 74160b93-b3f5-4d9f-b9c9-c9938784d69c
Footprint
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]
] Constraints (4)
{
"short_name": "Sun",
"name": "Sun Angle",
"min_angle": 45,
"max_angle": null
} {
"short_name": "Moon",
"name": "Moon Angle",
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"max_angle": null
} {
"short_name": "Earth",
"name": "Earth Limb",
"min_angle": 20,
"max_angle": null
} {
"short_name": "SAA",
"name": "South Atlantic Anomaly",
"polygon": [
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[
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[
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],
[
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],
[
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}