{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T08:12:30.988Z","years_from_j2000":26.683,"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-6303-b","name":"TOI-6303 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":496.47197659664965,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":46.7806502,"dec_deg":40.147174,"epoch_ra_deg":47.216012,"epoch_dec_deg":40.25087,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-6303","semi_major_axis_km":11384397.960269999,"periapsis_km":null,"mass_kg":1.488861449440391e+28,"mass_msun":0.0074877,"constellation":"Perseus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-6303-b","radius_km":73922.179,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-6303","host_v_mag":14.639,"eccentricity":0.02,"uncertainties":{"mass_kg":[5.9124461891134656e+26,5.9124461891134656e+26],"radius_km":[4081.9840000000004,3890.641],"distance_ly":[3.879630112940663,3.879630112940663],"eccentricity":[0.02,0.02],"host_mass_solar":[0.024,0.024],"inclination_deg":[0.2,0.28],"host_radius_solar":[0.016,0.016],"host_temperature_k":[59,59],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.0000162,0.0000162],"argument_of_periastron_deg":[258,38]},"host_mass_solar":0.644,"inclination_deg":89.03,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.609,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":3977,"orbital_period_days":9.485236,"transit_midpoint_bjd":2459901.0144,"equilibrium_temperature_k":541,"argument_of_periastron_deg":117},"designations":[{"catalog":"Exoplanet","designation":"TOI-6303 b"},{"catalog":"Host star","designation":"TOI-6303"}],"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."}