{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-09T00:53:17.402Z","years_from_j2000":26.687,"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":"toi-1820-b","name":"TOI-1820 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":810.5116448812161,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":187.6867207,"dec_deg":27.4520016,"epoch_ra_deg":188.021635,"epoch_dec_deg":27.303484,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-1820","semi_major_axis_km":9125470.112699999,"periapsis_km":null,"mass_kg":4.3656865794404574e+27,"mass_msun":0.00219557,"constellation":"Coma Berenices","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/toi-1820-b","radius_km":81500.8797878,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-1820","host_v_mag":10.899,"eccentricity":0.043,"uncertainties":{"mass_kg":[3.7962491995134415e+26,3.7962491995134415e+26],"radius_km":[1429.8399705410002,1429.8399705410002],"distance_ly":[11.565505153835721,11.8981846591068],"eccentricity":[0.008,0.008],"host_mass_solar":[0.13,0.13],"inclination_deg":[0.3,0.3],"host_radius_solar":[0.06,0.06],"host_temperature_k":[50,50],"semi_major_axis_km":[448793.61209999997,448793.61209999997],"orbital_period_days":[0.000005,0.000005],"argument_of_periastron_deg":[9,4]},"host_mass_solar":1.04,"inclination_deg":84.4,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.51,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":5734,"orbital_period_days":4.860674,"transit_midpoint_bjd":2458903.0638,"equilibrium_temperature_k":1375,"argument_of_periastron_deg":9},"designations":[{"catalog":"Exoplanet","designation":"TOI-1820 b"},{"catalog":"Host star","designation":"TOI-1820"}],"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."}