{"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":"2026-09-06T13:50:15.227Z","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-49-b","name":"WASP-49 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":634.5470175392558,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":91.0897193,"dec_deg":-16.9653901,"epoch_ra_deg":91.388298,"epoch_dec_deg":-16.966332,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-49","semi_major_axis_km":5669759.29953,"periapsis_km":null,"mass_kg":7.023096219654495e+26,"mass_msun":0.000353202,"constellation":"Lepus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/wasp-49-b","radius_km":79356.25641900001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-49","host_v_mag":11.352,"eccentricity":0,"uncertainties":{"mass_kg":[1.5185072907361073e+26,1.5185072907361073e+26],"radius_km":[7864.133519000001,7864.133519000001],"distance_ly":[3.8779993310520795,3.9236612239324233],"host_mass_solar":[0.3,0.3],"inclination_deg":[0.19,0.19],"host_radius_solar":[0.09,0.09],"host_temperature_k":[150,150],"semi_major_axis_km":[164557.65777,149597.8707],"orbital_period_days":[0.000006,0.000006]},"host_mass_solar":0.92,"inclination_deg":84.89,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.97,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"G6 V","host_temperature_k":5600,"orbital_period_days":2.78174,"transit_midpoint_bjd":2457377.596934,"equilibrium_temperature_k":1400,"argument_of_periastron_deg":90},"designations":[{"catalog":"Exoplanet","designation":"WASP-49 b"},{"catalog":"Host star","designation":"WASP-49"}],"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."}