{"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":"2026-09-07T06:42:52.676Z","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-77-a-b","name":"WASP-77 A b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":343.0056161895904,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":37.1555223,"dec_deg":-7.0606675,"epoch_ra_deg":37.488856,"epoch_dec_deg":-6.940326,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-77 A","semi_major_axis_km":3475702.025425253,"periapsis_km":null,"mass_kg":3.1611367084479816e+27,"mass_msun":0.00158978,"constellation":"Cetus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/wasp-77-a-b","radius_km":86487.03600000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-77 A","host_v_mag":10.294,"eccentricity":0.01353,"uncertainties":{"mass_kg":[8.541560510781954e+23,8.541560510781954e+23],"radius_km":[1403.182,1403.182],"distance_ly":[3.855168384611907,3.9432306065954283],"eccentricity":[0.0006,0.0006],"host_mass_solar":[0.059,0.066],"inclination_deg":[0.1,0.1],"host_radius_solar":[0.023,0.025],"host_temperature_k":[72,72],"semi_major_axis_km":[5.535121215899999,5.535121215899999],"orbital_period_days":[5.7e-8,5.7e-8],"argument_of_periastron_deg":[0.24,0.24]},"host_mass_solar":0.903,"inclination_deg":89.99,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.91,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"G8 V","host_temperature_k":5617,"orbital_period_days":1.360029395,"transit_midpoint_bjd":2459957.33786,"equilibrium_temperature_k":1674,"argument_of_periastron_deg":-88.29},"designations":[{"catalog":"Exoplanet","designation":"WASP-77 A b"},{"catalog":"Host star","designation":"WASP-77 A"}],"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."}