{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T16:39:38.681Z","years_from_j2000":26.664,"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-9-b","name":"Kepler-9 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2049.1002739518804,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":285.5739904,"dec_deg":38.4008192,"epoch_ra_deg":285.803337,"epoch_dec_deg":38.438998,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-9","semi_major_axis_km":21392495.510099996,"periapsis_km":null,"mass_kg":2.5919208546214584e+26,"mass_msun":0.000130351,"constellation":"Lyra","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/kepler-9-b","radius_km":52874.449,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-9","host_v_mag":13.922,"eccentricity":0.0609,"uncertainties":{"mass_kg":[1.1944335735582758e+25,9.555468588466207e+24],"radius_km":[2742.583,3444.1740000000004],"distance_ly":[21.99435533132859,21.99435533132859],"eccentricity":[0.0013,0.001],"host_mass_solar":[0.039,0.029],"inclination_deg":[0.005,0.007],"host_radius_solar":[0.02,0.02],"host_temperature_k":[60,60],"semi_major_axis_km":[897587.2241999999,1047185.0948999999],"orbital_period_days":[0.00006,0.00006],"argument_of_periastron_deg":[0.4,0.5]},"host_mass_solar":1.022,"inclination_deg":88.982,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.958,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":5774,"orbital_period_days":19.23891,"transit_midpoint_bjd":2454977.512,"equilibrium_temperature_k":661,"argument_of_periastron_deg":357},"designations":[{"catalog":"Exoplanet","designation":"Kepler-9 b"}],"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."}