{"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":"2026-09-07T03:05:19.357Z","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-8673-b","name":"HD 8673 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":123.48900157473567,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":21.5378455,"dec_deg":34.5793389,"epoch_ra_deg":21.918878,"epoch_dec_deg":34.719134,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 8673","semi_major_axis_km":444305675.979,"periapsis_km":null,"mass_kg":2.5146354697600922e+28,"mass_msun":0.0126465,"constellation":"Andromeda","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/hd-8673-b","radius_km":78450.63,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 8673","host_v_mag":6.331,"eccentricity":0.73,"uncertainties":{"mass_kg":[2.687744433243572e+27,3.204034324413233e+27],"distance_ly":[0.1764506003447582,0.1771029131001917],"eccentricity":[0.026,0.042],"host_mass_solar":[0.204,0.204],"inclination_deg":[8.816,19.444],"host_radius_solar":[0.078605,0.06146],"host_temperature_k":[119.46,157.03],"semi_major_axis_km":[25581235.8897,21990886.992899995],"orbital_period_days":[15.69616,10.98617],"argument_of_periastron_deg":[25.481,4.384]},"host_mass_solar":1.28,"inclination_deg":95.45,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.50225,"planets_in_system":1,"discovery_facility":"Thueringer Landessternwarte Tautenburg","host_spectral_type":"F5","host_temperature_k":6389.05,"orbital_period_days":1644.69097,"periastron_epoch_bjd":2451132.902,"equilibrium_temperature_k":219.11,"argument_of_periastron_deg":323.459},"designations":[{"catalog":"Exoplanet","designation":"HD 8673 b"},{"catalog":"Host star","designation":"HD 8673"}],"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."}