{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T04:12:04.961Z","years_from_j2000":26.682,"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-118-b","name":"WASP-118 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1228.4940891803315,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":19.5505861,"dec_deg":2.7027847,"epoch_ra_deg":19.897167,"epoch_dec_deg":2.844358,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-118","semi_major_axis_km":8157571.8892709995,"periapsis_km":null,"mass_kg":9.756409342979489e+26,"mass_msun":0.000490664,"constellation":"Pisces","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/wasp-118-b","radius_km":102948.656976,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-118","host_v_mag":11.009,"eccentricity":0,"uncertainties":{"mass_kg":[3.796268226840268e+25,3.796268226840268e+25],"radius_km":[2573.7164244,2573.7164244],"distance_ly":[34.50734476243145,36.526252740498094],"host_mass_solar":[0.035,0.035],"inclination_deg":[0.9,0.9],"host_radius_solar":[0.029,0.029],"host_temperature_k":[125,125],"semi_major_axis_km":[71806.977936,71806.977936],"orbital_period_days":[0.0000044,0.0000044]},"host_mass_solar":1.32,"inclination_deg":88.7,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.696,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"F6","host_temperature_k":6410,"orbital_period_days":4.0460435,"transit_midpoint_bjd":2456787.81423,"equilibrium_temperature_k":1729,"argument_of_periastron_deg":0},"designations":[{"catalog":"Exoplanet","designation":"WASP-118 b"},{"catalog":"Host star","designation":"WASP-118"}],"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."}