{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:55:00.288Z","years_from_j2000":26.683,"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":"at2021ueyl-b","name":"AT2021ueyL b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3392.0263282541314,"distance_method":"NASA Exoplanet Archive sy_dist (Ban+ 2025, 2025A&A...697A..57B)","ra_deg":324.5450417,"dec_deg":26.4665694,"epoch_ra_deg":324.84521,"epoch_dec_deg":26.58731,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"AT2021ueyL","semi_major_axis_km":599887461.507,"periapsis_km":null,"mass_kg":2.5434869636740056e+27,"mass_msun":0.00127916,"constellation":"Pegasus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/at2021ueyl-b","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"AT2021ueyL","uncertainties":{"mass_kg":[9.490622998783604e+26,8.541560698905243e+26],"distance_ly":[1435.088061953671,2413.5571951039014],"host_mass_solar":[0.18,0.16],"host_temperature_k":[204,307],"semi_major_axis_km":[200461146.738,251324422.77599996],"orbital_period_days":[1713.98,2910.76]},"host_mass_solar":0.49,"stars_in_system":1,"discovery_method":"Microlensing","planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"M V","host_temperature_k":3680,"orbital_period_days":4168.69},"designations":[{"catalog":"Exoplanet","designation":"AT2021ueyL b"},{"catalog":"Host star","designation":"AT2021ueyL"}],"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."}