{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.688","julian_year":2026.688,"time":"2026-09-09T03:22:16.827Z","years_from_j2000":26.688,"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":"wise-j033605-05-014350-4-b","name":"WISE J033605.05-014350.4 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":54.0210417,"dec_deg":-1.7306944,"epoch_ra_deg":54.361824,"epoch_dec_deg":-1.64128,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WISE J033605.05-014350.4","semi_major_axis_km":145109934.579,"periapsis_km":null,"mass_kg":1.5659527947992945e+28,"mass_msun":0.0078754,"constellation":"Eridanus","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/wise-j033605-05-014350-4-b","radius_km":80364.06,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WISE J033605.05-014350.4","uncertainties":{"mass_kg":[8.067029548966064e+27,8.067029548966064e+27],"host_mass_solar":[0.00597,0.00597],"host_temperature_k":[20,20],"semi_major_axis_km":[7479893.535,7479893.535],"orbital_period_days":[730,730]},"host_mass_solar":0.0131,"stars_in_system":1,"discovery_method":"Imaging","planets_in_system":1,"discovery_facility":"James Webb Space Telescope (JWST)","host_temperature_k":415,"orbital_period_days":2560,"equilibrium_temperature_k":325},"designations":[{"catalog":"Exoplanet","designation":"WISE J033605.05-014350.4 b"},{"catalog":"Host star","designation":"WISE J033605.05-014350.4"}],"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."}