{"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":"2026-09-02T06:08:07.097Z","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-80-c","name":"Kepler-80 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":1204.9879990382858,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":296.1125759,"dec_deg":39.9787451,"epoch_ra_deg":296.343173,"epoch_dec_deg":40.042732,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-80","semi_major_axis_km":11848151.35944,"periapsis_km":null,"mass_kg":4.025241142891389e+25,"mass_msun":0.0000202435,"constellation":"Cygnus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/kepler-80-c","radius_km":17475.994000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-80","host_v_mag":15.23,"eccentricity":0.0079,"uncertainties":{"mass_kg":[5.136064366300586e+24,7.345766477383396e+24],"radius_km":[637.8100000000001,765.3720000000001],"distance_ly":[9.440596353011138,9.440596353011138],"eccentricity":[0.0037,0.004],"host_mass_solar":[0.03,0.03],"inclination_deg":[0.57,0.47],"host_radius_solar":[0.023,0.023],"host_temperature_k":[100,100],"semi_major_axis_km":[164557.65777,164557.65777],"orbital_period_days":[0.00029,0.00041],"argument_of_periastron_deg":[16,26]},"host_mass_solar":0.73,"inclination_deg":89.33,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.678,"planets_in_system":6,"discovery_facility":"Kepler","host_spectral_type":"K5","host_temperature_k":4540,"orbital_period_days":9.52355,"transit_midpoint_bjd":2455696.047,"equilibrium_temperature_k":495,"argument_of_periastron_deg":190},"designations":[{"catalog":"Exoplanet","designation":"Kepler-80 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."}