{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T06:03:13.718Z","years_from_j2000":26.685,"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-23-a-b","name":"KELT-23 A b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":411.8083040689374,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":232.1466406,"dec_deg":66.3587097,"epoch_ra_deg":232.224784,"epoch_dec_deg":66.265168,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KELT-23 A","semi_major_axis_km":4939721.690514,"periapsis_km":null,"mass_kg":1.780449798388086e+27,"mass_msun":0.000895414,"constellation":"Ursa Minor","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/kelt-23-a-b","radius_km":94584.0785967,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KELT-23 A","host_v_mag":10.308,"eccentricity":0,"uncertainties":{"mass_kg":[8.35179009904859e+25,9.111043744416644e+25],"radius_km":[1787.3030725,1787.3030725],"distance_ly":[1.1448088857857692,1.1480704495629368],"host_mass_solar":[0.054,0.06],"inclination_deg":[0.3,0.31],"host_radius_solar":[0.015,0.015],"host_temperature_k":[49,49],"semi_major_axis_km":[95742.637248,101726.55207599999],"orbital_period_days":[0.000012,0.000011]},"host_mass_solar":0.944,"inclination_deg":85.37,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.996,"planets_in_system":1,"discovery_facility":"KELT-North","host_spectral_type":"G2 V","host_temperature_k":5899,"orbital_period_days":2.255251,"periastron_epoch_bjd":2458007.3194,"transit_midpoint_bjd":2458140.3792,"equilibrium_temperature_k":1561},"designations":[{"catalog":"Exoplanet","designation":"KELT-23 A b"},{"catalog":"Host star","designation":"KELT-23 A"}],"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."}