{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T01:44:08.059Z","years_from_j2000":26.671,"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":"ups-and-b","name":"υ And b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":43.722567058440326,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":24.1983534,"dec_deg":41.4038147,"epoch_ra_deg":24.595108,"epoch_dec_deg":41.540899,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"υ And","semi_major_axis_km":8859434.235319361,"periapsis_km":null,"mass_kg":1.3051038163163178e+27,"mass_msun":0.000656356,"constellation":"Andromeda","discovered":"1996","featured":false,"url":"https://spacecatalog.org/object/ups-and-b","radius_km":89293.40000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"υ And","host_v_mag":4.09565,"eccentricity":0.0215,"uncertainties":{"mass_kg":[8.351419824640787e+24,8.351419824640787e+24],"distance_ly":[0.2051523615838316,0.20710929985013207],"eccentricity":[0.0007,0.0007],"host_temperature_k":[112.16,112.16],"semi_major_axis_km":[29.919574139999995,29.919574139999995],"orbital_period_days":[0.000023,0.000023],"argument_of_periastron_deg":[3.8,3.8]},"host_mass_solar":1.3,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.56,"planets_in_system":3,"discovery_facility":"Lick Observatory","host_spectral_type":"F8 V","host_temperature_k":6156.77,"orbital_period_days":4.617033,"periastron_epoch_bjd":2450005.368,"transit_midpoint_bjd":2453335.89,"equilibrium_temperature_k":1523.73,"argument_of_periastron_deg":324.9},"designations":[{"catalog":"Exoplanet","designation":"ups And b"}],"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."}