{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T18:49:40.699Z","years_from_j2000":26.665,"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-352-d","name":"Kepler-352 d","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":824.3047980948571,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":299.8966237,"dec_deg":46.0519022,"epoch_ra_deg":300.104945,"epoch_dec_deg":46.124621,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-352","semi_major_axis_km":9834564.019818,"periapsis_km":null,"mass_kg":2.6815033726383296e+24,"mass_msun":0.00000134857,"constellation":"Cygnus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/kepler-352-d","radius_km":5142.536508992001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-352","host_v_mag":13.142,"eccentricity":0,"uncertainties":{"distance_ly":[4.510742703822562,4.56292772425724],"host_mass_solar":[0.046,0.046],"host_radius_solar":[0.041,0.055],"host_temperature_k":[103,103],"semi_major_axis_km":[61335.126986999996,61335.126986999996]},"host_mass_solar":0.796,"inclination_deg":88.66,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.772,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":5208,"orbital_period_days":6.887279987,"transit_midpoint_bjd":2454965.06897,"equilibrium_temperature_k":788},"designations":[{"catalog":"Exoplanet","designation":"Kepler-352 d"},{"catalog":"Host star","designation":"Kepler-352"}],"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."}