{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T14:14:07.679Z","years_from_j2000":26.672,"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-159-b","name":"WASP-159 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2333.267279601371,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.1364792,"dec_deg":-38.9682973,"epoch_ra_deg":68.369022,"epoch_dec_deg":-38.910777,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-159","semi_major_axis_km":8048365.443659999,"periapsis_km":null,"mass_kg":1.0439737623810737e+27,"mass_msun":0.000525029,"constellation":"Caelum","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/wasp-159-b","radius_km":98659.129602,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-159","host_v_mag":12.836,"eccentricity":0,"uncertainties":{"mass_kg":[1.5185072907361073e+26,1.5185072907361073e+26],"radius_km":[6434.291061,6434.291061],"distance_ly":[34.13552649183436,35.1433496989791],"host_mass_solar":[0.12,0.12],"inclination_deg":[1.4,1.4],"host_radius_solar":[0.1,0.1],"host_temperature_k":[140,140],"semi_major_axis_km":[224396.80604999998,224396.80604999998],"orbital_period_days":[0.000007,0.000007]},"host_mass_solar":1.41,"inclination_deg":88.1,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":2.11,"planets_in_system":1,"discovery_facility":"SuperWASP-South","host_spectral_type":"F9","host_temperature_k":6120,"orbital_period_days":3.840401,"transit_midpoint_bjd":2457668.0849,"equilibrium_temperature_k":1850},"designations":[{"catalog":"Exoplanet","designation":"WASP-159 b"},{"catalog":"Host star","designation":"WASP-159"}],"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."}