{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T22:08:00.559Z","years_from_j2000":26.684,"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-217-b","name":"KOI-217 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2983.3491254112746,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":294.8654667,"dec_deg":46.2858128,"epoch_ra_deg":295.066732,"epoch_dec_deg":46.34686,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KOI-217","semi_major_axis_km":7135818.43239,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/koi-217-b","radius_km":79356.3202,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KOI-217","host_v_mag":15.257,"eccentricity":0,"uncertainties":{"radius_km":[1428.6944,1428.6944],"distance_ly":[55.99289614452193,55.99289614452193],"inclination_deg":[0.4,0.2],"semi_major_axis_km":[104718.50949,104718.50949],"orbital_period_days":[0.00005,0.00005]},"host_mass_solar":0.95,"inclination_deg":89.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.86,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5545,"orbital_period_days":3.90512,"transit_midpoint_bjd":2454966.414,"equilibrium_temperature_k":1046},"designations":[{"catalog":"Exoplanet","designation":"KOI-217 b"},{"catalog":"Host star","designation":"KOI-217"}],"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."}