{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T15:07:15.525Z","years_from_j2000":26.67,"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":"pr0201-b","name":"Pr0201 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":589.1688807075253,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":130.4324005,"dec_deg":20.2268164,"epoch_ra_deg":130.818661,"epoch_dec_deg":20.13124,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Pr0201","semi_major_axis_km":8975872.241999999,"periapsis_km":null,"mass_kg":1.0249924212468723e+27,"mass_msun":0.000515483,"constellation":"Cancer","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/pr0201-b","radius_km":90569.02,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Pr0201","host_v_mag":10.445,"eccentricity":0,"uncertainties":{"mass_kg":[2.277760936104161e+26,2.277760936104161e+26],"distance_ly":[7.9027690320766935,8.114770677592576],"host_mass_solar":[0.39,0.39],"host_radius_solar":[0.12,0.12],"host_temperature_k":[50,50],"orbital_period_days":[0.007,0.007]},"host_mass_solar":1.24,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.15,"planets_in_system":1,"discovery_facility":"Fred Lawrence Whipple Observatory","host_temperature_k":6174,"orbital_period_days":4.4264,"periastron_epoch_bjd":2455992.861,"equilibrium_temperature_k":1303.39},"designations":[{"catalog":"Exoplanet","designation":"Pr0201 b"},{"catalog":"Host star","designation":"Pr0201"}],"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."}