{"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":"2026-09-08T02:40:57.472Z","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-5573-b","name":"TOI-5573 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":608.4838613959109,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":136.4259999,"dec_deg":55.3071309,"epoch_ra_deg":136.92068,"epoch_dec_deg":55.199895,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"TOI-5573","semi_major_axis_km":10651368.393839998,"periapsis_km":null,"mass_kg":6.688828011926345e+26,"mass_msun":0.000336391,"constellation":"Ursa Major","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/toi-5573-b","radius_km":62186.475000000006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"TOI-5573","host_v_mag":15.508,"eccentricity":0.072,"uncertainties":{"mass_kg":[1.1347118948803621e+26,1.0749902162024482e+26],"radius_km":[2997.707,2997.707],"distance_ly":[4.246556037872,4.305264185861013],"eccentricity":[0.048,0.067],"host_mass_solar":[0.023,0.023],"inclination_deg":[0.2,0.39],"host_radius_solar":[0.011,0.011],"host_temperature_k":[59,59],"semi_major_axis_km":[119678.29656,119678.29656],"orbital_period_days":[0.00001001,0.00000986],"argument_of_periastron_deg":[100.4,76.95]},"host_mass_solar":0.619,"inclination_deg":89.01,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.594,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_temperature_k":3790,"orbital_period_days":8.79758977,"transit_midpoint_bjd":2459600.45078,"equilibrium_temperature_k":528,"argument_of_periastron_deg":32.8},"designations":[{"catalog":"Exoplanet","designation":"TOI-5573 b"},{"catalog":"Host star","designation":"TOI-5573"}],"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."}