{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T11:20:21.104Z","years_from_j2000":26.669,"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-424-c","name":"Kepler-424 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2278.678486662919,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":298.6249797,"dec_deg":48.57745,"epoch_ra_deg":298.818984,"epoch_dec_deg":48.647259,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-424","semi_major_axis_km":109206445.61099999,"periapsis_km":null,"mass_kg":1.3229426817374106e+28,"mass_msun":0.00665327,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-424-c","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-424","host_v_mag":14.429,"uncertainties":{"mass_kg":[1.1768156783482914e+27,1.1768156783482914e+27],"distance_ly":[32.10683382243622,33.02333324382027],"host_mass_solar":[0.054,0.054],"host_radius_solar":[0.056,0.056],"host_temperature_k":[81,81],"semi_major_axis_km":[10471850.949000001,11967829.656],"orbital_period_days":[2.1,2.1]},"host_mass_solar":1.01,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.94,"planets_in_system":2,"discovery_facility":"McDonald Observatory","host_temperature_k":5460,"orbital_period_days":223.3,"periastron_epoch_bjd":2455403.4,"equilibrium_temperature_k":298.76},"designations":[{"catalog":"Exoplanet","designation":"Kepler-424 c"}],"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."}