{"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":"2026-09-06T16:14:40.518Z","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-117-b","name":"WASP-117 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":515.2063989326994,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":36.7758112,"dec_deg":-50.2844247,"epoch_ra_deg":37.014369,"epoch_dec_deg":-50.163438,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-117","semi_major_axis_km":14150462.589512998,"periapsis_km":null,"mass_kg":5.6944023402604025e+26,"mass_msun":0.00028638,"constellation":"Eridanus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/wasp-117-b","radius_km":75781.650274,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-117","host_v_mag":10.139,"eccentricity":0.3,"uncertainties":{"mass_kg":[9.490670567100671e+25,9.490670567100671e+25],"radius_km":[5004.448603000001,5004.448603000001],"distance_ly":[2.0613083071698184,2.0743545622784882],"eccentricity":[0.02,0.02],"host_mass_solar":[0.3,0.3],"inclination_deg":[0.3,0.3],"host_radius_solar":[0.06,0.06],"host_temperature_k":[90,90],"semi_major_axis_km":[118182.31785299999,125662.211388],"orbital_period_days":[0.00055,0.00055],"argument_of_periastron_deg":[2.7,2.3]},"host_mass_solar":1.29,"inclination_deg":89.14,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.22,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"F9","host_temperature_k":6040,"orbital_period_days":10.02165,"transit_midpoint_bjd":2458728.334175,"equilibrium_temperature_k":1001,"argument_of_periastron_deg":242},"designations":[{"catalog":"Exoplanet","designation":"WASP-117 b"},{"catalog":"Host star","designation":"WASP-117"}],"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."}