{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:57:05.975Z","years_from_j2000":26.685,"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-4603-b","name":"TOI-4603 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":735.9490353713913,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":83.8659288,"dec_deg":21.2942417,"epoch_ra_deg":84.26814,"epoch_dec_deg":21.312002,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-4603","semi_major_axis_km":13284290.918159999,"periapsis_km":null,"mass_kg":2.446682609086413e+28,"mass_msun":0.0123047,"constellation":"Taurus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/toi-4603-b","radius_km":74494.663798209,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-4603","host_v_mag":9.24,"eccentricity":0.325,"uncertainties":{"mass_kg":[1.0819310218613307e+27,1.1009122678588978e+27],"radius_km":[2502.2199643920003,2716.696014187],"distance_ly":[7.9321231060712,8.101724422483906],"eccentricity":[0.02,0.02],"host_mass_solar":[0.061,0.061],"inclination_deg":[0.41,0.39],"host_radius_solar":[0.05,0.048],"host_temperature_k":[94,95],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.00021,0.00022],"argument_of_periastron_deg":[4.7,4.6]},"host_mass_solar":1.765,"inclination_deg":80.21,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":2.738,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"F","host_temperature_k":6264,"orbital_period_days":7.24599,"periastron_epoch_bjd":2459548.363,"transit_midpoint_bjd":2459549.126,"equilibrium_temperature_k":1677,"argument_of_periastron_deg":20.4},"designations":[{"catalog":"Exoplanet","designation":"TOI-4603 b"},{"catalog":"Host star","designation":"TOI-4603"}],"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."}