{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T20:12:27.273Z","years_from_j2000":26.668,"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-407-c","name":"Kepler-407 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1103.6088121525904,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":286.0363025,"dec_deg":49.6145027,"epoch_ra_deg":286.210622,"epoch_dec_deg":49.653789,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-407","semi_major_axis_km":489320227.2887728,"periapsis_km":null,"mass_kg":2.3888671471165516e+28,"mass_msun":0.012014,"constellation":"Draco","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-407-c","radius_km":78450.63,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-407","host_v_mag":12.603,"eccentricity":0.221479,"uncertainties":{"mass_kg":[1.1944335735582758e+28,1.1944335735582758e+28],"distance_ly":[8.13760162403275,8.255017920010776],"eccentricity":[0.000308,0.000308],"host_mass_solar":[0.06,0.06],"host_radius_solar":[0.07,0.07],"host_temperature_k":[75,75],"orbital_period_days":[500,500]},"host_mass_solar":1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.01,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G","host_temperature_k":5476,"orbital_period_days":3000,"equilibrium_temperature_k":146.73},"designations":[{"catalog":"Exoplanet","designation":"Kepler-407 c"},{"catalog":"Host star","designation":"Kepler-407"}],"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."}