{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T16:20:48.675Z","years_from_j2000":26.673,"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-23596-b","name":"HD 23596 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":169.60718722750548,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":57.0018601,"dec_deg":40.5307308,"epoch_ra_deg":57.452485,"epoch_dec_deg":40.613583,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 23596","semi_major_axis_km":403016663.6658,"periapsis_km":null,"mass_kg":2.2614256481513515e+28,"mass_msun":0.011373,"constellation":"Perseus","discovered":"2003","featured":false,"url":"https://spacecatalog.org/object/hd-23596-b","radius_km":79088.44,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 23596","host_v_mag":7.26122,"eccentricity":0.282,"uncertainties":{"mass_kg":[3.355884292393771e+27,1.8791433537591535e+27],"distance_ly":[0.3333318180265118,0.33463644353737876],"eccentricity":[0.014,0.017],"host_mass_solar":[0.137,0.137],"inclination_deg":[77.179,15.759],"host_radius_solar":[0.03,0.03],"host_temperature_k":[29,29],"semi_major_axis_km":[17652548.742599998,16006972.1649],"orbital_period_days":[9.26013,7.76172],"argument_of_periastron_deg":[3.544,3.372]},"host_mass_solar":1.1,"inclination_deg":38.898,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.53,"planets_in_system":1,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"F8","host_temperature_k":6040,"orbital_period_days":1535.11912,"periastron_epoch_bjd":2450036.142,"equilibrium_temperature_k":219.49,"argument_of_periastron_deg":264.57},"designations":[{"catalog":"Exoplanet","designation":"HD 23596 b"},{"catalog":"Host star","designation":"HD 23596"}],"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."}