{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T08:15:33.604Z","years_from_j2000":26.669,"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":"ab-aur-b","name":"AB Aur b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":528.7875505008246,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":73.9410446,"dec_deg":30.5510888,"epoch_ra_deg":74.369624,"epoch_dec_deg":30.594118,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"AB Aur","semi_major_axis_km":14047240058.73,"periapsis_km":null,"mass_kg":1.7083121397810487e+28,"mass_msun":0.00859135,"constellation":"Auriga","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/ab-aur-b","radius_km":79726.25,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"AB Aur","host_v_mag":7.076,"eccentricity":0.4,"uncertainties":{"distance_ly":[4.885822538196816,4.977146323957505],"eccentricity":[0.21,0.2],"host_mass_solar":[0.2,0.2],"inclination_deg":[15.5,15.6],"host_radius_solar":[0.070698,0.096638],"host_temperature_k":[100,100],"semi_major_axis_km":[7375175025.509999,7375175025.509999]},"host_mass_solar":2.4,"inclination_deg":42.6,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":2.95887,"planets_in_system":1,"discovery_facility":"Subaru Telescope","host_temperature_k":9770,"equilibrium_temperature_k":83.63},"designations":[{"catalog":"Exoplanet","designation":"AB Aur b"},{"catalog":"Host star","designation":"AB Aur"}],"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":"2026-09-01T22:58:55.274Z","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."}