{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T06:42:22.834Z","years_from_j2000":26.674,"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-101-b","name":"WASP-101 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":656.3049094967397,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":98.3511016,"dec_deg":-23.486086,"epoch_ra_deg":98.630759,"epoch_dec_deg":-23.505895,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-101","semi_major_axis_km":7565164.321298999,"periapsis_km":null,"mass_kg":9.680483978442684e+26,"mass_msun":0.000486846,"constellation":"Canis Major","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/wasp-101-b","radius_km":102233.73574700001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-101","host_v_mag":10.336,"eccentricity":0,"uncertainties":{"mass_kg":[1.5185072907361073e+26,1.5185072907361073e+26],"radius_km":[6434.291061,6434.291061],"distance_ly":[3.7149211421937074,3.757321471296884],"host_mass_solar":[0.3,0.3],"inclination_deg":[0.2,0.2],"host_radius_solar":[0.08,0.08],"host_temperature_k":[120,120],"semi_major_axis_km":[134638.08362999998,127158.19009499998],"orbital_period_days":[0.000004,0.000004]},"host_mass_solar":1.41,"inclination_deg":85,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.31,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"F6","host_temperature_k":6380,"orbital_period_days":3.58572,"transit_midpoint_bjd":2458387.832522,"equilibrium_temperature_k":1560},"designations":[{"catalog":"Exoplanet","designation":"WASP-101 b"},{"catalog":"Host star","designation":"WASP-101"}],"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."}