{"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":"2026-09-06T22:32:03.191Z","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-20-b","name":"NGTS-20 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1248.8462471498563,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":46.2926368,"dec_deg":-21.9336472,"epoch_ra_deg":46.593969,"epoch_dec_deg":-21.82892,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"NGTS-20","semi_major_axis_km":46824133.52909999,"periapsis_km":null,"mass_kg":5.656411307275027e+27,"mass_msun":0.00284469,"constellation":"Eridanus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/ngts-20-b","radius_km":76496.439795235,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"NGTS-20","host_v_mag":11.233,"eccentricity":0.432,"uncertainties":{"mass_kg":[2.8471868996350808e+26,3.036999359610753e+26],"radius_km":[2859.6800048630002,2859.6800048630002],"distance_ly":[23.34953508074166,24.243203555685536],"eccentricity":[0.023,0.023],"host_mass_solar":[0.09,0.09],"inclination_deg":[0.6,0.6],"host_radius_solar":[0.05,0.05],"host_temperature_k":[80,80],"semi_major_axis_km":[1944772.3190999997,1944772.3190999997],"orbital_period_days":[0.00015,0.00015],"argument_of_periastron_deg":[3.2,3.2]},"host_mass_solar":1.47,"inclination_deg":88.4,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.78,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"G1 IV","host_temperature_k":5980,"orbital_period_days":54.18915,"transit_midpoint_bjd":2458432.9798,"equilibrium_temperature_k":688,"argument_of_periastron_deg":66.1},"designations":[{"catalog":"Exoplanet","designation":"NGTS-20 b"},{"catalog":"Host star","designation":"NGTS-20"}],"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."}