{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T14:45:55.708Z","years_from_j2000":26.678,"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-3-b","name":"KELT-3 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":685.7503072770074,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":148.6431193,"dec_deg":40.3879446,"epoch_ra_deg":149.054599,"epoch_dec_deg":40.261153,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KELT-3","semi_major_axis_km":6167920.208961,"periapsis_km":null,"mass_kg":3.68238018003506e+27,"mass_msun":0.00185192,"constellation":"Leo Minor","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kelt-3-b","radius_km":111527.71172400001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KELT-3","host_v_mag":9.816,"eccentricity":0,"uncertainties":{"mass_kg":[6.263842574286442e+26,6.263842574286442e+26],"radius_km":[7864.133519000001,7864.133519000001],"distance_ly":[17.191702669449544,18.082109580616255],"host_mass_solar":[0.5,0.5],"inclination_deg":[0.57,0.57],"host_radius_solar":[0.12,0.12],"host_temperature_k":[49,49],"semi_major_axis_km":[98734.59466199999,98734.59466199999],"orbital_period_days":[0.00001,0.00001]},"host_mass_solar":1.96,"inclination_deg":84.14,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.7,"planets_in_system":1,"discovery_facility":"KELT","host_temperature_k":6304,"orbital_period_days":2.70339,"transit_midpoint_bjd":2458872.854373,"equilibrium_temperature_k":1816,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"KELT-3 b"},{"catalog":"Host star","designation":"KELT-3"}],"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."}