{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T17:29:07.124Z","years_from_j2000":26.681,"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-168863-b","name":"HD 168863 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":130.12954542504858,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":275.6642157,"dec_deg":-18.0219726,"epoch_ra_deg":276.056897,"epoch_dec_deg":-18.008983,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 168863","semi_major_axis_km":1639742260.7426999,"periapsis_km":null,"mass_kg":1.2869284786350565e+28,"mass_msun":0.00647215,"constellation":"Sagittarius","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-168863-b","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 168863","host_v_mag":9.35,"eccentricity":0.187,"uncertainties":{"mass_kg":[2.0803445613214215e+27,2.1145108041409313e+27],"distance_ly":[0.2997377111216872,0.3013684930102709],"eccentricity":[0.064,0.181],"host_mass_solar":[0.101,0.101],"inclination_deg":[7.609,5.088],"host_radius_solar":[0.069487,0.064874],"host_temperature_k":[153.97,170.1],"semi_major_axis_km":[212877770.0061,568172712.9186],"orbital_period_days":[2644.05863,8638.61024],"argument_of_periastron_deg":[35.444,35.623]},"host_mass_solar":0.8,"inclination_deg":129.839,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.777826,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":4905,"orbital_period_days":14773.93272,"periastron_epoch_bjd":2442151.009,"equilibrium_temperature_k":63.01,"argument_of_periastron_deg":134.572},"designations":[{"catalog":"Exoplanet","designation":"HD 168863 b"},{"catalog":"Host star","designation":"HD 168863"}],"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."}