{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.688","julian_year":2026.688,"time":"2026-09-09T03:51:27.703Z","years_from_j2000":26.688,"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-f","name":"KOI-351 f","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":284.608589,"epoch_dec_deg":49.340387,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KOI-351","semi_major_axis_km":71806977.93599999,"periapsis_km":null,"mass_kg":5.165925205639543e+25,"mass_msun":0.0000259802,"constellation":"Draco","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/koi-351-f","radius_km":18368.928,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KOI-351","host_v_mag":13.883,"eccentricity":0,"uncertainties":{"radius_km":[3316.612,3316.612],"distance_ly":[35.285227723285885,35.285227723285885],"host_mass_solar":[0.1,0.1],"inclination_deg":[0.31,0.31],"host_radius_solar":[0.1,0.1],"host_temperature_k":[170,260],"semi_major_axis_km":[13463808.362999998,13463808.362999998],"orbital_period_days":[0.0019,0.0019]},"host_mass_solar":1.2,"inclination_deg":89.77,"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":124.9144,"transit_midpoint_bjd":2455087.704,"equilibrium_temperature_k":407},"designations":[{"catalog":"Exoplanet","designation":"KOI-351 f"}],"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."}