{"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":"2026-09-08T09:54:02.149Z","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-183263-b","name":"HD 183263 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":176.7620796854777,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":292.1022982,"dec_deg":8.3579183,"epoch_ra_deg":292.426054,"epoch_dec_deg":8.412457,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 183263","semi_major_axis_km":218412891.22199997,"periapsis_km":null,"mass_kg":6.588390485773494e+27,"mass_msun":0.0033134,"constellation":"Aquila","discovered":"2004","featured":false,"url":"https://spacecatalog.org/object/hd-183263-b","radius_km":83553.11,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 183263","host_v_mag":7.86,"eccentricity":0.383,"uncertainties":{"mass_kg":[5.770298783379874e+26,5.4855800931177576e+26],"distance_ly":[0.36757823768676984,0.3688828631976368],"eccentricity":[0.007,0.007],"host_mass_solar":[0.136,0.136],"inclination_deg":[41,39],"host_radius_solar":[0.02,0.02],"host_temperature_k":[27,27],"semi_major_axis_km":[9723861.5955,8975872.241999999],"orbital_period_days":[0.26179,0.2537],"argument_of_periastron_deg":[1.279,1.149]},"host_mass_solar":1.06,"inclination_deg":90,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.23,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G2 IV","host_temperature_k":5948,"orbital_period_days":624.87404,"periastron_epoch_bjd":2451487.545,"transit_midpoint_bjd":2456925.2,"equilibrium_temperature_k":263.26,"argument_of_periastron_deg":232.05},"designations":[{"catalog":"Exoplanet","designation":"HD 183263 b"},{"catalog":"Host star","designation":"HD 183263"}],"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."}