{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T12:56:05.543Z","years_from_j2000":26.686,"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":"wd-1856-534-b","name":"WD 1856+534 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":80.67771543563593,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":284.415675,"dec_deg":53.5090244,"epoch_ra_deg":284.563259,"epoch_dec_deg":53.544213,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WD 1856+534","semi_major_axis_km":3051796.56228,"periapsis_km":null,"mass_kg":2.619425076519785e+28,"mass_msun":0.0131735,"constellation":"Draco","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/wd-1856-534-b","radius_km":66332.24,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WD 1856+534","host_v_mag":17.244,"eccentricity":0,"uncertainties":{"radius_km":[6378.1,6378.1],"distance_ly":[0.1412257115513499,0.14187802430678337],"host_mass_solar":[0.055,0.055],"inclination_deg":[0.059,0.059],"host_radius_solar":[0.00054,0.00054],"host_temperature_k":[60,60],"semi_major_axis_km":[179517.44483999998,179517.44483999998],"orbital_period_days":[0.0000011,0.0000011]},"host_mass_solar":0.518,"inclination_deg":88.778,"stars_in_system":3,"discovery_method":"Transit","host_radius_solar":0.0131,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"DC","host_temperature_k":4710,"orbital_period_days":1.4079405,"transit_midpoint_bjd":2458779.3750828,"equilibrium_temperature_k":163},"designations":[{"catalog":"Exoplanet","designation":"WD 1856+534 b"},{"catalog":"Host star","designation":"WD 1856+534"}],"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."}