{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T06:19:03.667Z","years_from_j2000":26.685,"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":"24-sex-b","name":"24 Sex b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":235.05796601305755,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":155.8684866,"dec_deg":-0.9023998,"epoch_ra_deg":156.211708,"epoch_dec_deg":-1.038164,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"24 Sex","semi_major_axis_km":199413961.64309996,"periapsis_km":null,"mass_kg":3.777157289663336e+27,"mass_msun":0.00189959,"constellation":"Sextans","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/24-sex-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"24 Sex","host_v_mag":6.4535,"eccentricity":0.09,"uncertainties":{"mass_kg":[7.212587133931648e+26,4.9348023091560164e+26],"distance_ly":[2.19438010927825,2.2354758128705594],"eccentricity":[0.06,0.14],"host_mass_solar":[0.08,0.08],"host_radius_solar":[0.08,0.08],"host_temperature_k":[44,44],"semi_major_axis_km":[1346380.8362999998,598391.4828],"orbital_period_days":[4.5,2.1],"argument_of_periastron_deg":[165.4,277.9]},"host_mass_solar":1.54,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":4.9,"planets_in_system":2,"discovery_facility":"Lick Observatory","host_spectral_type":"K0 IV","host_temperature_k":5098,"orbital_period_days":452.8,"periastron_epoch_bjd":2454762,"equilibrium_temperature_k":471.32,"argument_of_periastron_deg":9.2},"designations":[{"catalog":"Exoplanet","designation":"24 Sex b"},{"catalog":"Host star","designation":"24 Sex"}],"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."}