{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:42:41.015Z","years_from_j2000":26.681,"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":"wasp-139-b","name":"WASP-139 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":692.9909788623191,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":49.562173,"dec_deg":-41.3020235,"epoch_ra_deg":49.807677,"epoch_dec_deg":-41.203506,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-139","semi_major_axis_km":9275067.983399998,"periapsis_km":null,"mass_kg":2.2208169127015567e+26,"mass_msun":0.000111688,"constellation":"Eridanus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/wasp-139-b","radius_km":57193.69832,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-139","host_v_mag":12.456,"eccentricity":0,"uncertainties":{"mass_kg":[3.226827992814228e+25,3.226827992814228e+25],"radius_km":[3574.606145,3574.606145],"distance_ly":[3.581197027329843,3.6203357926558524],"host_mass_solar":[0.1,0.1],"inclination_deg":[0.5,0.5],"host_radius_solar":[0.04,0.04],"host_temperature_k":[90,90],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.000004,0.000004]},"host_mass_solar":0.92,"inclination_deg":88.9,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.8,"planets_in_system":1,"discovery_facility":"SuperWASP-South","host_spectral_type":"K0","host_temperature_k":5310,"orbital_period_days":5.924262,"transit_midpoint_bjd":2457196.7933,"equilibrium_temperature_k":910},"designations":[{"catalog":"Exoplanet","designation":"WASP-139 b"},{"catalog":"Host star","designation":"WASP-139"}],"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."}