{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T12:48:39.910Z","years_from_j2000":26.686,"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-240210-b","name":"HD 240210 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1214.6226584360381,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":347.6219227,"dec_deg":57.0294818,"epoch_ra_deg":347.913724,"epoch_dec_deg":57.175192,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 240210","semi_major_axis_km":173533530.01199996,"periapsis_km":null,"mass_kg":9.888834998846321e+27,"mass_msun":0.00497324,"constellation":"Cassiopeia","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/hd-240210-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 240210","host_v_mag":8.270001,"eccentricity":0.15,"uncertainties":{"distance_ly":[15.916431232577079,15.916431232577079],"eccentricity":[0.02,0.02],"host_mass_solar":[0.15,0.15],"host_radius_solar":[0.743471,1.17929],"host_temperature_k":[25,25],"orbital_period_days":[2.33,2.33],"argument_of_periastron_deg":[7.77,7.77]},"host_mass_solar":0.82,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":25.456816,"planets_in_system":1,"discovery_facility":"McDonald Observatory","host_spectral_type":"K3 III","host_temperature_k":4297,"orbital_period_days":501.75,"periastron_epoch_bjd":2454487.38,"equilibrium_temperature_k":970.67,"argument_of_periastron_deg":277.59},"designations":[{"catalog":"Exoplanet","designation":"HD 240210 b"},{"catalog":"Host star","designation":"HD 240210"}],"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."}