3. ODS Data JSON Fields

For the latest ODS JSON Schema, see Live JSON schema v1.0.0

Also, here is the auto-generated FastAPI documentation

Field name	Required	Type	Constraints	Units	Description
corr_integ_time_sec	FALSE	float	x >= 0	seconds	integration time of the raw spectra. Used to estimate power and noise temperature
dish_diameter_m	TRUE	float	x >= 0	meters	diameter of the dish
freq_lower_hz	TRUE	float	x >= 0	Hertz	lower limit frequency used during this interval
freq_upper_hz	TRUE	float	x >= 0	Hertz	upper limit frequency used during this interval
site_el_m	TRUE	float		meters	elevation of the instrument
site_id	TRUE	string			identifier of the instrument
site_lat_deg	TRUE	float	-90 <= x <= 90	decimal-degrees +/- DDD.D	latitude of the instrument
site_lon_deg	TRUE	float	-180 <= x <= 180	decimal-degrees +/- DDD.D	longitude of the instrument
slew_sec	TRUE	float	x >= 0	seconds	time taken for instrument to reach source
src_dec_j2000_deg	TRUE	float	-90 <= x <= 90	decimal-degrees +/- DDD.D	declination of source/target
src_end_utc	TRUE	datetime		UTC Datetime	end time of this observing interval in UTC
src_id	FALSE	string			internal identifier of source/target
src_ra_j2000_deg	TRUE	float	0 <= x <= 360	decimal-degrees +/- DDD.D	right ascension of the source/target
src_start_utc	TRUE	datetime		UTC Datetime	start time of this observing interval
subarray	FALSE	integer			subarray number of instrument
trk_rate_dec_deg_per_sec	TRUE	float		decimal-degrees +/- DDD.D	declination tracking of src, defaults to 0
trk_rate_ra_deg_per_sec	TRUE	float		decimal-degrees +/- DDD.D	right ascension tracking of src, defaults to 0
version	TRUE	string			version of this file

3.1. Examples of the ODS query return

{"ods_data": [
  {"corr_integ_time_sec": 3,
   "freq_lower_hz": 26000000000,
   "freq_upper_hz": 40000000000,
   "notes": "inAdv:True",
   "site_el_m": 2124,
   "site_id": "vla_D",
   "site_lat_deg": 34.07874917,
   "site_lon_deg": -107.6177275,
   "slew_sec": 130.8,
   "src_dec_j2000_deg": 3.15681115,
   "src_end_utc": "2023-08-16T15:26:16.000723",
   "src_id": "J1056+7011",
   "src_is_pulsar_bool": false,
   "src_ra_j2000_deg": 126.459743145833,
   "src_radius": 0,
   "src_start_utc": "2023-08-16T15:23:47.000541",
   "trk_rate_dec_deg_per_sec": 0,
   "trk_rate_ra_deg_per_sec": 0} ]}

3.2. JSON Schema Change History

• v1.0.0 (18 Jul 2025 - present)

  • Removed:

    • src_is_pulsar_bool (boolean)

    • src_radius (float)

    • notes (string)

  • Added:

    • dish_diameter_m (float)

    • subarray (integer)

    • version (string)

• v.helloworld.1 (Aug 2023 - 18 Jul 2025)

  • Still being supported by SpaceX as of Oct 2025