{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T11:26:27.398Z","years_from_j2000":26.683,"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-206255-b","name":"HD 206255 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":245.38799080810222,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":325.5917768,"dec_deg":-50.0935884,"epoch_ra_deg":326.038576,"epoch_dec_deg":-49.971145,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 206255","semi_major_axis_km":68964618.3927,"periapsis_km":null,"mass_kg":2.0424814107846517e+26,"mass_msun":0.000102719,"constellation":"Indus","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-206255-b","radius_km":41266.307,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 206255","host_v_mag":7.62,"eccentricity":0.23,"uncertainties":{"mass_kg":[4.2402391861318795e+25,4.2402391861318795e+25],"distance_ly":[0.6474204097677357,0.6506819735449032],"eccentricity":[0.11,0.11],"host_mass_solar":[0.08,0.08],"host_radius_solar":[0.063458,0.080309],"host_temperature_k":[99,82],"semi_major_axis_km":[1346380.8362999998,1346380.8362999998],"orbital_period_days":[0.317,0.317],"argument_of_periastron_deg":[44.9,44.9]},"host_mass_solar":1.42,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":2.221489,"planets_in_system":1,"discovery_facility":"Las Campanas Observatory","host_spectral_type":"G5 IV/V","host_temperature_k":5635,"orbital_period_days":96.045,"equilibrium_temperature_k":596.48,"argument_of_periastron_deg":86.92},"designations":[{"catalog":"Exoplanet","designation":"HD 206255 b"},{"catalog":"Host star","designation":"HD 206255"}],"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."}