{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T01:26:17.153Z","years_from_j2000":26.679,"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-50-b","name":"WASP-50 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":602.8935410818459,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":43.6880738,"dec_deg":-10.8980242,"epoch_ra_deg":44.012728,"epoch_dec_deg":-10.788591,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-50","semi_major_axis_km":4383217.611509999,"periapsis_km":null,"mass_kg":2.787979385791493e+27,"mass_msun":0.00140212,"constellation":"Eridanus","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/wasp-50-b","radius_km":83359.81530140001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-50","host_v_mag":11.44,"eccentricity":0.009,"uncertainties":{"mass_kg":[1.7462833843465232e+26,1.7462833843465232e+26],"radius_km":[3074.1612847,3074.1612847],"distance_ly":[6.004538913765246,6.128478337297609],"eccentricity":[0.006,0.011],"host_mass_solar":[0.074,0.08],"inclination_deg":[0.27,0.27],"host_radius_solar":[0.031,0.031],"host_temperature_k":[100,100],"semi_major_axis_km":[194477.23190999997,194477.23190999997],"orbital_period_days":[0.000005,0.000005],"argument_of_periastron_deg":[80,62]},"host_mass_solar":0.892,"inclination_deg":84.88,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.843,"planets_in_system":1,"discovery_facility":"SuperWASP","host_temperature_k":5400,"orbital_period_days":1.9551,"transit_midpoint_bjd":2458411.09342,"equilibrium_temperature_k":1394.84,"argument_of_periastron_deg":44},"designations":[{"catalog":"Exoplanet","designation":"WASP-50 b"},{"catalog":"Host star","designation":"WASP-50"}],"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."}