{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T14:57:16.822Z","years_from_j2000":26.664,"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":"gu-psc-b","name":"GU Psc b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":155.0876837606892,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":18.146485,"dec_deg":17.0650029,"epoch_ra_deg":18.504263,"epoch_dec_deg":17.207609,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GU Psc","semi_major_axis_km":299195741400,"periapsis_km":null,"mass_kg":2.1447846463599182e+28,"mass_msun":0.0107864,"constellation":"Pisces","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/gu-psc-b","radius_km":90435.07990000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GU Psc","host_v_mag":14.146,"uncertainties":{"mass_kg":[3.226762298967682e+27,3.226762298967682e+27],"radius_km":[8221.3709,8221.3709],"distance_ly":[0.5342441467000257,0.5378318668549099],"host_mass_solar":[0.025,0.025],"host_radius_solar":[0.013265,0.013265],"host_temperature_k":[168.54,69.69],"semi_major_axis_km":[29919574139.999996,29919574139.999996]},"host_mass_solar":0.325,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":0.450458,"planets_in_system":1,"discovery_facility":"Gemini Observatory","host_spectral_type":"M3","host_temperature_k":4031.81,"equilibrium_temperature_k":1050},"designations":[{"catalog":"Exoplanet","designation":"GU Psc b"},{"catalog":"Host star","designation":"GU Psc"}],"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":"2026-08-30T09:56:50.739Z","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."}