{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T18:00:52.488Z","years_from_j2000":26.667,"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-271-c","name":"Kepler-271 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1319.439533542868,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":283.0029316,"dec_deg":44.284108,"epoch_ra_deg":283.204352,"epoch_dec_deg":44.315741,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-271","semi_major_axis_km":10461379.098051,"periapsis_km":null,"mass_kg":4.831483805043226e+24,"mass_msun":0.00000242982,"constellation":"Lyra","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-271-c","radius_km":6059.195,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-271","host_v_mag":13.578,"eccentricity":0,"uncertainties":{"radius_km":[382.68600000000004,382.68600000000004],"distance_ly":[12.3189263863614,12.550497414540287],"host_mass_solar":[0.045,0.041],"host_radius_solar":[0.042,0.046],"host_temperature_k":[59.33,60.07],"semi_major_axis_km":[130150.14750899999,130150.14750899999],"orbital_period_days":[0.00003305,0.00003305]},"host_mass_solar":0.9,"inclination_deg":89.79,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.87,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":5555,"orbital_period_days":7.41086267,"transit_midpoint_bjd":2454968.75273,"equilibrium_temperature_k":850},"designations":[{"catalog":"Exoplanet","designation":"Kepler-271 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."}