{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T05:08:56.480Z","years_from_j2000":26.677,"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-91-b","name":"WASP-91 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":489.04539587603944,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":357.846434,"dec_deg":-70.1528621,"epoch_ra_deg":358.211072,"epoch_dec_deg":-70.003501,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-91","semi_major_axis_km":5535121.215899999,"periapsis_km":null,"mass_kg":2.5434997119829797e+27,"mass_msun":0.00127916,"constellation":"Tucana","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/wasp-91-b","radius_km":73636.886587,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-91","host_v_mag":11.98,"eccentricity":0,"uncertainties":{"mass_kg":[1.5185072907361073e+26,1.5185072907361073e+26],"radius_km":[2859.684916,2859.684916],"distance_ly":[1.682966909018396,1.6927516003498984],"host_mass_solar":[0.07,0.07],"inclination_deg":[0.4,0.4],"host_radius_solar":[0.03,0.03],"host_temperature_k":[80,80],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.000003,0.000003]},"host_mass_solar":0.84,"inclination_deg":86.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.86,"planets_in_system":1,"discovery_facility":"SuperWASP-South","host_spectral_type":"K3","host_temperature_k":4920,"orbital_period_days":2.798581,"transit_midpoint_bjd":2456297.719,"equilibrium_temperature_k":1160},"designations":[{"catalog":"Exoplanet","designation":"WASP-91 b"},{"catalog":"Host star","designation":"WASP-91"}],"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."}