{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T16:19:44.501Z","years_from_j2000":26.686,"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":"wasp-123-b","name":"WASP-123 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":645.7765816240433,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":289.4792124,"dec_deg":-32.8601244,"epoch_ra_deg":289.914911,"epoch_dec_deg":-32.811883,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-123","semi_major_axis_km":6377357.227941,"periapsis_km":null,"mass_kg":1.7064225679647006e+27,"mass_msun":0.000858185,"constellation":"Sagittarius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/wasp-123-b","radius_km":96514.19976549501,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-123","host_v_mag":11.03,"eccentricity":0,"uncertainties":{"mass_kg":[6.833282808312482e+25,6.833282808312482e+25],"radius_km":[3574.5999582430004,3574.5999582430004],"distance_ly":[9.76186038506213,10.0554011250072],"host_mass_solar":[0.061,0.061],"inclination_deg":[0.5,0.5],"host_radius_solar":[0.051,0.051],"host_temperature_k":[130,130],"semi_major_axis_km":[110702.42431799999,110702.42431799999],"orbital_period_days":[5.2e-7,5.2e-7]},"host_mass_solar":1.166,"inclination_deg":86.2,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.285,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"G5","host_temperature_k":5740,"orbital_period_days":2.97764359,"transit_midpoint_bjd":2456845.1735,"equilibrium_temperature_k":1500},"designations":[{"catalog":"Exoplanet","designation":"WASP-123 b"},{"catalog":"Host star","designation":"WASP-123"}],"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."}