{"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":"2026-09-01T06:50:52.951Z","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-285-c","name":"Kepler-285 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2688.5396371568877,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.3908469,"dec_deg":48.0655392,"epoch_ra_deg":291.578924,"epoch_dec_deg":48.118123,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-285","semi_major_axis_km":9574263.7248,"periapsis_km":null,"mass_kg":8.719365086975414e+24,"mass_msun":0.00000438509,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-285-c","radius_km":7143.472000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-285","host_v_mag":15.198,"eccentricity":0,"uncertainties":{"radius_km":[3125.2690000000002,3125.2690000000002],"distance_ly":[50.270482497481666,52.18828199845612],"host_mass_solar":[0.026,0.026],"host_radius_solar":[0.348,0.348],"host_temperature_k":[200,200],"orbital_period_days":[0.000059,0.000059]},"host_mass_solar":0.915,"inclination_deg":89.95,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.808,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5411,"orbital_period_days":6.186676,"transit_midpoint_bjd":2454969.63351,"equilibrium_temperature_k":851},"designations":[{"catalog":"Exoplanet","designation":"Kepler-285 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."}