{"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":"2026-09-06T16:44:17.685Z","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-141-b","name":"WASP-141 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1684.737938149398,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":71.8244347,"dec_deg":-17.1151736,"epoch_ra_deg":72.125141,"epoch_dec_deg":-17.066713,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-141","semi_major_axis_km":7016140.135829999,"periapsis_km":null,"mass_kg":5.105980765100161e+27,"mass_msun":0.00256787,"constellation":"Eridanus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/wasp-141-b","radius_km":86505.46870900001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-141","host_v_mag":12.65,"eccentricity":0,"uncertainties":{"mass_kg":[2.8472011701302012e+26,2.8472011701302012e+26],"radius_km":[5719.369832,5719.369832],"distance_ly":[27.286242559782753,28.1831725985038],"host_mass_solar":[0.06,0.06],"inclination_deg":[1.3,1.3],"host_radius_solar":[0.07,0.07],"host_temperature_k":[120,120],"semi_major_axis_km":[104718.50949,104718.50949],"orbital_period_days":[0.000005,0.000005]},"host_mass_solar":1.25,"inclination_deg":87.6,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.37,"planets_in_system":1,"discovery_facility":"SuperWASP-South","host_spectral_type":"F9","host_temperature_k":5900,"orbital_period_days":3.310651,"transit_midpoint_bjd":2457019.5953,"equilibrium_temperature_k":1540},"designations":[{"catalog":"Exoplanet","designation":"WASP-141 b"},{"catalog":"Host star","designation":"WASP-141"}],"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."}