{"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":"2026-09-06T19:28:15.860Z","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-99-b","name":"WASP-99 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":517.4797088853851,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":39.8976689,"dec_deg":-50.0081934,"epoch_ra_deg":40.129578,"epoch_dec_deg":-49.892167,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-99","semi_major_axis_km":10726167.329189999,"periapsis_km":null,"mass_kg":4.612465895610926e+27,"mass_msun":0.00231968,"constellation":"Eridanus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/wasp-99-b","radius_km":72921.965358,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-99","host_v_mag":9.475,"eccentricity":0,"uncertainties":{"mass_kg":[7.023096219654495e+26,7.023096219654495e+26],"radius_km":[4289.527374,4289.527374],"distance_ly":[2.6092510217339475,2.6386050957284546],"host_mass_solar":[0.28,0.28],"inclination_deg":[1.1,1.1],"host_radius_solar":[0.09,0.09],"host_temperature_k":[100,100],"semi_major_axis_km":[239356.59312,239356.59312],"orbital_period_days":[0.00004,0.00004]},"host_mass_solar":1.21,"inclination_deg":88.8,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.64,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"F8","host_temperature_k":6150,"orbital_period_days":5.75251,"transit_midpoint_bjd":2459135.7959211,"equilibrium_temperature_k":1480},"designations":[{"catalog":"Exoplanet","designation":"WASP-99 b"},{"catalog":"Host star","designation":"WASP-99"}],"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."}