{"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":"2026-09-02T15:34:23.180Z","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":"hd-42012-b","name":"HD 42012 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":120.02032849771811,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":92.485473,"dec_deg":34.1341722,"epoch_ra_deg":92.930773,"epoch_dec_deg":34.129411,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 42012","semi_major_axis_km":249828444.06899998,"periapsis_km":null,"mass_kg":3.037014581472215e+27,"mass_msun":0.00152736,"constellation":"Auriga","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/hd-42012-b","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 42012","host_v_mag":8.44,"uncertainties":{"mass_kg":[1.8981341134201343e+26,1.8981341134201343e+26],"distance_ly":[0.30234696214342116,0.3039777440320049],"host_mass_solar":[0.08,0.08],"host_radius_solar":[0.08,0.08],"host_temperature_k":[45,45],"semi_major_axis_km":[8975872.241999999,7479893.535],"orbital_period_days":[6.3,6.2]},"host_mass_solar":0.83,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.82,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"K0","host_temperature_k":5405,"orbital_period_days":857.5,"periastron_epoch_bjd":2455386.2,"eccentricity_upper_limit":0.2,"equilibrium_temperature_k":182.63},"designations":[{"catalog":"Exoplanet","designation":"HD 42012 b"},{"catalog":"Host star","designation":"HD 42012"}],"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."}