{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T19:54:37.461Z","years_from_j2000":26.679,"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":"kelt-8-b","name":"KELT-8 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":644.3936785825243,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":283.3054489,"dec_deg":24.1272483,"epoch_ra_deg":283.584188,"epoch_dec_deg":24.159792,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KELT-8","semi_major_axis_km":6806703.116849999,"periapsis_km":null,"mass_kg":1.2527685148572884e+27,"mass_msun":0.000630035,"constellation":"Hercules","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/kelt-8-b","radius_km":115817.239098,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KELT-8","host_v_mag":10.845,"eccentricity":0.04,"uncertainties":{"mass_kg":[2.277760936104161e+26,2.277760936104161e+26],"radius_km":[7149.21229,7149.21229],"distance_ly":[3.245255958281597,3.277871596053271],"eccentricity":[0.05,0.05],"host_mass_solar":[0.21,0.21],"inclination_deg":[0.9,0.9],"host_radius_solar":[0.08,0.08],"host_temperature_k":[54,54],"semi_major_axis_km":[131646.126216,124166.232681],"orbital_period_days":[0.00016,0.00016],"argument_of_periastron_deg":[97,87]},"host_mass_solar":0.81,"inclination_deg":82.65,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.46,"planets_in_system":1,"discovery_facility":"KELT","host_spectral_type":"G2 V","host_temperature_k":5754,"orbital_period_days":3.24406,"periastron_epoch_bjd":2456870.47,"transit_midpoint_bjd":2457986.46737,"equilibrium_temperature_k":1675,"argument_of_periastron_deg":85},"designations":[{"catalog":"Exoplanet","designation":"KELT-8 b"},{"catalog":"Host star","designation":"KELT-8"}],"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."}