{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T01:13:54.522Z","years_from_j2000":26.682,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"ngts-3-a-b","name":"NGTS-3 A b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2426.5121264268105,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":94.4447595,"dec_deg":-35.706364,"epoch_ra_deg":94.681682,"epoch_dec_deg":-35.715974,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-3 A","semi_major_axis_km":3440751.0260999994,"periapsis_km":null,"mass_kg":4.5175591899399186e+27,"mass_msun":0.00227195,"constellation":"Columba","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/ngts-3-a-b","radius_km":105808.34189200001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-3 A","host_v_mag":14.669,"uncertainties":{"mass_kg":[4.9351486948923485e+26,4.9351486948923485e+26],"radius_km":[26452.085473000003,26452.085473000003],"distance_ly":[34.53343727264879,35.524952660907694],"host_mass_solar":[0.093,0.093],"inclination_deg":[0.48,0.31],"host_radius_solar":[0.23,0.23],"host_temperature_k":[150,150],"semi_major_axis_km":[747989.3535,1047185.0948999999],"orbital_period_days":[0.000003,0.000003]},"host_mass_solar":1.017,"inclination_deg":89.56,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.93,"planets_in_system":1,"discovery_facility":"Next-Generation Transit Survey (NGTS)","host_spectral_type":"G6 V","host_temperature_k":5600,"orbital_period_days":1.6753728,"transit_midpoint_bjd":2457620.1679,"equilibrium_temperature_k":1434.44},"designations":[{"catalog":"Exoplanet","designation":"NGTS-3 A b"},{"catalog":"Host star","designation":"NGTS-3 A"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}