{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T09:17:57.704Z","years_from_j2000":26.666,"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-82-c","name":"Kepler-82 c","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2949.516924350717,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.8733696,"dec_deg":42.9661583,"epoch_ra_deg":293.088221,"epoch_dec_deg":43.022378,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-82","semi_major_axis_km":39284400.845819995,"periapsis_km":null,"mass_kg":8.301313336230017e+25,"mass_msun":0.0000417485,"constellation":"Cygnus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/kepler-82-c","radius_km":34059.054000000004,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-82","host_v_mag":15.131,"eccentricity":0.007,"uncertainties":{"mass_kg":[7.166601441349655e+24,7.763818228128793e+24],"radius_km":[829.153,2040.9920000000002],"distance_ly":[72.0397899281857,72.0397899281857],"eccentricity":[0.0018,0.0016],"host_mass_solar":[0.03,0.03],"inclination_deg":[0.22,0.18],"host_radius_solar":[0.018,0.042],"host_temperature_k":[60,60],"semi_major_axis_km":[478713.18624,478713.18624],"orbital_period_days":[0.94,0.94],"argument_of_periastron_deg":[20,12]},"host_mass_solar":0.91,"inclination_deg":90.15,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.898,"planets_in_system":5,"discovery_facility":"Kepler","host_temperature_k":5401,"orbital_period_days":51.54,"transit_midpoint_bjd":2455007.05501,"equilibrium_temperature_k":450,"argument_of_periastron_deg":162},"designations":[{"catalog":"Exoplanet","designation":"Kepler-82 c"},{"catalog":"Host star","designation":"Kepler-82"}],"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."}