{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T04:46:18.413Z","years_from_j2000":26.685,"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-212301-b","name":"HD 212301 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":176.87590826130082,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":336.8803957,"dec_deg":-77.7183219,"epoch_ra_deg":337.499272,"epoch_dec_deg":-77.581324,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 212301","semi_major_axis_km":4487936.120999999,"periapsis_km":null,"mass_kg":9.680483978442684e+26,"mass_msun":0.000486846,"constellation":"Octans","discovered":"2005","featured":false,"url":"https://spacecatalog.org/object/hd-212301-b","radius_km":90569.02,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 212301","host_v_mag":7.76,"eccentricity":0,"uncertainties":{"mass_kg":[7.592536453680536e+25,7.592536453680536e+25],"distance_ly":[0.2795160157032491,0.2804944848363993],"host_mass_solar":[0.16,0.16],"host_radius_solar":[0.02,0.02],"host_temperature_k":[24,24],"orbital_period_days":[0.00028,0.00028]},"host_mass_solar":1.55,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.16,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"F8 V","host_temperature_k":6239,"orbital_period_days":2.24571,"equilibrium_temperature_k":1870.75},"designations":[{"catalog":"Exoplanet","designation":"HD 212301 b"},{"catalog":"Host star","designation":"HD 212301"}],"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."}