{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T04:42:06.515Z","years_from_j2000":26.674,"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-406-c","name":"Kepler-406 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1187.307061802261,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.8481764,"dec_deg":44.9682807,"epoch_ra_deg":292.05276,"epoch_dec_deg":45.022041,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-406","semi_major_axis_km":8274258.228416999,"periapsis_km":null,"mass_kg":1.6184574921714637e+25,"mass_msun":0.00000813946,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-406-c","radius_km":5421.385,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-406","host_v_mag":12.603,"eccentricity":0,"uncertainties":{"mass_kg":[1.0749902162024483e+25,1.0749902162024483e+25],"radius_km":[191.34300000000002,191.34300000000002],"distance_ly":[10.89362301573923,11.095839969923611],"host_mass_solar":[0.06,0.06],"host_radius_solar":[0.02,0.02],"host_temperature_k":[75,75],"semi_major_axis_km":[79286.87147099999,79286.87147099999]},"host_mass_solar":1.07,"inclination_deg":87.96,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.07,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5538,"orbital_period_days":4.62332,"transit_midpoint_bjd":2454965.37438,"equilibrium_temperature_k":1050},"designations":[{"catalog":"Exoplanet","designation":"Kepler-406 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":"2026-09-02T19:50:56.720Z","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."}