{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T15:35:16.478Z","years_from_j2000":26.684,"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":"hd-210193-b","name":"HD 210193 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":137.64744993141952,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":332.3951324,"dec_deg":-41.225205,"epoch_ra_deg":332.801362,"epoch_dec_deg":-41.093466,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 210193","semi_major_axis_km":222452033.7309,"periapsis_km":null,"mass_kg":9.143389005588602e+26,"mass_msun":0.000459834,"constellation":"Grus","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-210193-b","radius_km":91206.83000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 210193","host_v_mag":7.83,"eccentricity":0.24,"uncertainties":{"mass_kg":[1.3915151131953914e+26,1.3915151131953914e+26],"distance_ly":[0.2583158511516608,0.25896816390709426],"eccentricity":[0.09,0.09],"host_mass_solar":[0.06,0.06],"host_radius_solar":[0.01377,0.01873],"host_temperature_k":[50,38],"semi_major_axis_km":[4637533.991699999,4637533.991699999],"orbital_period_days":[8.599,8.599],"argument_of_periastron_deg":[28.69,28.69]},"host_mass_solar":1.04,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.05971,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"G3 V","host_temperature_k":5790,"orbital_period_days":649.918,"equilibrium_temperature_k":235.69,"argument_of_periastron_deg":168.84},"designations":[{"catalog":"Exoplanet","designation":"HD 210193 b"},{"catalog":"Host star","designation":"HD 210193"}],"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."}