{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T04:30:31.562Z","years_from_j2000":26.682,"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-213240-b","name":"HD 213240 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":133.30239466747705,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":337.7506266,"dec_deg":-49.4341037,"epoch_ra_deg":338.162764,"epoch_dec_deg":-49.296327,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 213240","semi_major_axis_km":282739975.62299997,"periapsis_km":null,"mass_kg":9.889229164732515e+27,"mass_msun":0.00497344,"constellation":"Grus","discovered":"2001","featured":false,"url":"https://spacecatalog.org/object/hd-213240-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 213240","host_v_mag":6.81,"eccentricity":0.42,"uncertainties":{"mass_kg":[9.300810538807931e+26,2.847186899635081e+27],"distance_ly":[0.20384773607296464,0.20417389245068138],"eccentricity":[0.01,0.01],"host_mass_solar":[0.12,0.12],"inclination_deg":[20,17],"host_radius_solar":[0.02,0.02],"host_temperature_k":[19,19],"semi_major_axis_km":[4487936.120999999,4487936.120999999],"orbital_period_days":[7.6,7.6],"argument_of_periastron_deg":[1.5,1.4]},"host_mass_solar":1.57,"inclination_deg":63,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.51,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"G0/1 V","host_temperature_k":5979,"orbital_period_days":882.70001,"periastron_epoch_bjd":2451520,"equilibrium_temperature_k":257.7,"argument_of_periastron_deg":201.9},"designations":[{"catalog":"Exoplanet","designation":"HD 213240 b"},{"catalog":"Host star","designation":"HD 213240"}],"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."}