{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T21:08:49.757Z","years_from_j2000":26.681,"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":"kic-8121913-b","name":"KIC 8121913 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2306.9138442818576,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":298.9677981,"dec_deg":43.909378,"epoch_ra_deg":299.18496,"epoch_dec_deg":43.980058,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KIC 8121913","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":3.986061659489113e+27,"mass_msun":0.00200465,"constellation":"Cygnus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/kic-8121913-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KIC 8121913","host_v_mag":12.38,"uncertainties":{"mass_kg":[7.592498399026883e+26,7.592498399026883e+26],"distance_ly":[35.77283150797242,36.89807101109518],"host_mass_solar":[0.15,0.069],"host_radius_solar":[0.056,0.054],"host_temperature_k":[109.4,110.2],"orbital_period_days":[0.00022,0.000013]},"host_mass_solar":1.456,"stars_in_system":1,"discovery_method":"Orbital Brightness Modulation","host_radius_solar":2.233,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5975.3,"orbital_period_days":3.294601},"designations":[{"catalog":"Exoplanet","designation":"KIC 8121913 b"},{"catalog":"Host star","designation":"KIC 8121913"}],"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."}