{"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":"2026-09-02T05:30:42.588Z","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-347-c","name":"Kepler-347 c","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":4236.379958887237,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":289.1995995,"dec_deg":49.3056404,"epoch_ra_deg":289.378526,"epoch_dec_deg":49.352837,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-347","semi_major_axis_km":27376410.338099997,"periapsis_km":null,"mass_kg":2.215674278950602e+25,"mass_msun":0.0000111429,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-347-c","radius_km":11161.675000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-347","host_v_mag":14.567,"eccentricity":0,"uncertainties":{"radius_km":[5357.604,5357.604],"distance_ly":[90.21485407645123,94.16134624682383],"host_mass_solar":[0.021,0.022],"host_radius_solar":[0.464,0.464],"host_temperature_k":[200,200],"orbital_period_days":[0.000457,0.000457]},"host_mass_solar":0.922,"inclination_deg":85.39,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.005,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":6088,"orbital_period_days":27.320871,"transit_midpoint_bjd":2454987.30618,"equilibrium_temperature_k":705},"designations":[{"catalog":"Exoplanet","designation":"Kepler-347 c"},{"catalog":"Host star","designation":"Kepler-347"}],"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."}