{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T03:37:34.600Z","years_from_j2000":26.668,"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":"pr0211-b","name":"Pr0211 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":595.9333639813706,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":130.547744,"dec_deg":19.276957,"epoch_ra_deg":130.931772,"epoch_dec_deg":19.18116,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Pr0211","semi_major_axis_km":4751228.373431999,"periapsis_km":null,"mass_kg":3.568492133229852e+27,"mass_msun":0.00179465,"constellation":"Cancer","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/pr0211-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Pr0211","host_v_mag":12.163,"eccentricity":0.011,"uncertainties":{"mass_kg":[5.694402340260402e+25,5.694402340260402e+25],"distance_ly":[3.427903529802973,3.4670422951289823],"eccentricity":[0.008,0.012],"host_mass_solar":[0.013,0.013],"host_radius_solar":[0.012,0.012],"host_temperature_k":[30,30],"semi_major_axis_km":[22439.680604999998,22439.680604999998],"orbital_period_days":[0.00003,0.00003],"argument_of_periastron_deg":[111,87]},"host_mass_solar":0.935,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":0.827,"planets_in_system":2,"discovery_facility":"Fred Lawrence Whipple Observatory","host_temperature_k":5300,"orbital_period_days":2.1461,"periastron_epoch_bjd":2456678.8,"equilibrium_temperature_k":1304.13,"argument_of_periastron_deg":17},"designations":[{"catalog":"Exoplanet","designation":"Pr0211 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":"2026-09-01T22:58:55.274Z","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."}