{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:59:20.899Z","years_from_j2000":26.683,"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":"koi-351-d","name":"KOI-351 d","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":2766.6345202373845,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":284.4334642,"dec_deg":49.3051239,"epoch_ra_deg":284.608566,"epoch_dec_deg":49.340401,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KOI-351","semi_major_axis_km":47871318.624,"periapsis_km":null,"mass_kg":5.136064366300586e+25,"mass_msun":0.00002583,"constellation":"Draco","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/koi-351-d","radius_km":18305.147,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KOI-351","host_v_mag":13.883,"eccentricity":0,"uncertainties":{"radius_km":[1913.43,1913.43],"distance_ly":[35.285227723285885,35.285227723285885],"host_mass_solar":[0.1,0.1],"inclination_deg":[0.29,0.29],"host_radius_solar":[0.1,0.1],"host_temperature_k":[170,260],"semi_major_axis_km":[7479893.535,7479893.535],"orbital_period_days":[0.00038,0.00038]},"host_mass_solar":1.2,"inclination_deg":89.71,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.2,"planets_in_system":8,"discovery_facility":"Kepler","host_temperature_k":6080,"orbital_period_days":59.73667,"transit_midpoint_bjd":2454991.9656,"equilibrium_temperature_k":520},"designations":[{"catalog":"Exoplanet","designation":"KOI-351 d"}],"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":"2026-09-02T19:50:56.720Z","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."}