{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T01:59:46.458Z","years_from_j2000":26.668,"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":"kepler-63-b","name":"Kepler-63 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":632.8510043751287,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":289.2262876,"dec_deg":49.5482814,"epoch_ra_deg":289.403814,"epoch_dec_deg":49.59554,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-63","semi_major_axis_km":11967829.656,"periapsis_km":null,"mass_kg":7.166601441349655e+26,"mass_msun":0.000360419,"constellation":"Cygnus","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-63-b","radius_km":38970.191000000006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-63","host_v_mag":12.02,"uncertainties":{"radius_km":[1275.6200000000001,1275.6200000000001],"distance_ly":[3.0952240245318947,3.127839662303569],"host_mass_solar":[0.04,0.035],"inclination_deg":[0.019,0.018],"host_radius_solar":[0.022,0.027],"host_temperature_k":[50,50],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.000001,0.000001]},"host_mass_solar":0.984,"inclination_deg":87.806,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.901,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G5","host_temperature_k":5576,"orbital_period_days":9.4341505,"transit_midpoint_bjd":2455010.84307,"eccentricity_upper_limit":0.45,"equilibrium_temperature_k":791,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"Kepler-63 b"},{"catalog":"Host star","designation":"Kepler-63"}],"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":"2026-09-01T22:58:55.274Z","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."}