{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T21:57:14.246Z","years_from_j2000":26.665,"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-8-b","name":"Kepler-8 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3332.894176974086,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":281.2881335,"dec_deg":42.4510975,"epoch_ra_deg":281.497599,"epoch_dec_deg":42.478345,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-8","semi_major_axis_km":7090939.071179999,"periapsis_km":null,"mass_kg":1.119899126917879e+27,"mass_msun":0.000563213,"constellation":"Lyra","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/kepler-8-b","radius_km":101232.8460264,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-8","host_v_mag":13.598,"eccentricity":0,"uncertainties":{"mass_kg":[2.277760936104161e+26,2.4675743474461742e+26],"radius_km":[4432.5116198,3789.0825137],"distance_ly":[47.53729205221535,47.53729205221535],"host_mass_solar":[0.062,0.067],"inclination_deg":[0.033,0.036],"host_radius_solar":[0.062,0.053],"host_temperature_k":[150,150],"semi_major_axis_km":[314155.52846999996,269276.16725999996],"orbital_period_days":[7e-7,7e-7]},"host_mass_solar":1.213,"inclination_deg":83.978,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.486,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6213,"orbital_period_days":3.5224991,"transit_midpoint_bjd":2454954.11931,"equilibrium_temperature_k":1680},"designations":[{"catalog":"Exoplanet","designation":"Kepler-8 b"},{"catalog":"Host star","designation":"Kepler-8"}],"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":"2026-08-30T09:56:50.739Z","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."}