{"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":"2026-09-01T19:35:16.370Z","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-79-c","name":"Kepler-79 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":3329.1433786303437,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":300.5171067,"dec_deg":44.3815508,"epoch_ra_deg":300.733911,"epoch_dec_deg":44.455702,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-79","semi_major_axis_km":28639016.366807997,"periapsis_km":null,"mass_kg":2.7471972191840344e+25,"mass_msun":0.0000138161,"constellation":"Cygnus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/kepler-79-c","radius_km":23981.656,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-79","host_v_mag":14.036,"eccentricity":0.038,"uncertainties":{"mass_kg":[6.569384654570517e+24,7.763818228128793e+24],"radius_km":[701.591,701.591],"distance_ly":[55.69120149513394,55.69120149513394],"eccentricity":[0.014,0.019],"host_mass_solar":[0.042,0.027],"inclination_deg":[0.09,0.07],"host_radius_solar":[0.037,0.038],"host_temperature_k":[60,60],"semi_major_axis_km":[267780.188553,267780.188553],"orbital_period_days":[0.0003,0.0004],"argument_of_periastron_deg":[12,12]},"host_mass_solar":1.244,"inclination_deg":89.48,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.316,"planets_in_system":4,"discovery_facility":"Kepler","host_temperature_k":6389,"orbital_period_days":27.4026,"transit_midpoint_bjd":2455706.4771,"equilibrium_temperature_k":734,"argument_of_periastron_deg":223},"designations":[{"catalog":"Exoplanet","designation":"Kepler-79 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":"2026-08-30T09:56:50.739Z","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."}