{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T04:52:25.048Z","years_from_j2000":26.677,"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-331093-b","name":"HD 331093 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":163.70701835460957,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":295.6200054,"dec_deg":31.7395451,"epoch_ra_deg":295.880115,"epoch_dec_deg":31.802446,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 331093","semi_major_axis_km":215420933.80799997,"periapsis_km":null,"mass_kg":2.847186899635081e+27,"mass_msun":0.00143189,"constellation":"Cygnus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hd-331093-b","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 331093","host_v_mag":8.38,"eccentricity":0.59,"uncertainties":{"mass_kg":[2.0879370597323927e+26,2.0879370597323927e+26],"distance_ly":[0.298759241988537,0.30006386749940395],"eccentricity":[0.03,0.03],"host_mass_solar":[0.079,0.079],"host_radius_solar":[0.06204,0.056281],"host_temperature_k":[33,33],"semi_major_axis_km":[10471850.949000001,10471850.949000001],"orbital_period_days":[16.11,16.11],"argument_of_periastron_deg":[27.06,27.06]},"host_mass_solar":1.03,"inclination_deg":0.3704,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.1112,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"K0","host_temperature_k":5544,"orbital_period_days":621.62,"periastron_epoch_bjd":2459022.81,"equilibrium_temperature_k":234.84,"argument_of_periastron_deg":165.77},"designations":[{"catalog":"Exoplanet","designation":"HD 331093 b"},{"catalog":"Host star","designation":"HD 331093"}],"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."}