{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T11:03:33.770Z","years_from_j2000":26.667,"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-643-b","name":"Kepler-643 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3468.9340021197395,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":290.3272423,"dec_deg":42.8982283,"epoch_ra_deg":290.540219,"epoch_dec_deg":42.948239,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-643","semi_major_axis_km":20173272.863895,"periapsis_km":null,"mass_kg":1.9171154545543356e+27,"mass_msun":0.000964145,"constellation":"Lyra","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-643-b","radius_km":64801.49600000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-643","host_v_mag":13.988,"eccentricity":0.37,"uncertainties":{"mass_kg":[3.7962682268402685e+26,3.7962682268402685e+26],"radius_km":[1722.0870000000002,2232.335],"distance_ly":[57.15890519485928,57.15890519485928],"eccentricity":[0.06,0.06],"host_mass_solar":[0.041,0.066],"host_radius_solar":[0.065,0.081],"host_temperature_k":[47.77,45.26],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.00001826,0.00001826]},"host_mass_solar":1,"inclination_deg":88.91,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":2.52,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":4908,"orbital_period_days":16.33889626,"transit_midpoint_bjd":2455010.916757,"equilibrium_temperature_k":963},"designations":[{"catalog":"Exoplanet","designation":"Kepler-643 b"},{"catalog":"Host star","designation":"Kepler-643"}],"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."}