{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T05:39:34.904Z","years_from_j2000":26.671,"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":"wts-2-b","name":"WTS-2 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3361.91669464804,"distance_method":"NASA Exoplanet Archive sy_dist (Gaia DR2, 2018A&A...616A...1G)","ra_deg":293.7327826,"dec_deg":36.8154936,"epoch_ra_deg":293.973681,"epoch_dec_deg":36.873843,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WTS-2","semi_major_axis_km":2775040.501485,"periapsis_km":null,"mass_kg":2.1259102070305503e+27,"mass_msun":0.00106915,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/wts-2-b","radius_km":97443.76351270001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WTS-2","host_v_mag":15.954,"eccentricity":0,"uncertainties":{"mass_kg":[3.0370145814722146e+26,3.0370145814722146e+26],"radius_km":[4361.0194969,4361.0194969],"distance_ly":[467.4652394119503,467.4652394119503],"host_mass_solar":[0.082,0.082],"inclination_deg":[0.53,0.53],"host_radius_solar":[0.032,0.032],"host_temperature_k":[250,250],"semi_major_axis_km":[92750.679834,92750.679834],"orbital_period_days":[6.5e-7,6.5e-7],"argument_of_periastron_deg":[15,29]},"host_mass_solar":0.82,"inclination_deg":83.55,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.752,"planets_in_system":1,"discovery_facility":"United Kingdom Infrared Telescope","host_spectral_type":"K2 V","host_temperature_k":5000,"orbital_period_days":1.0187068,"transit_midpoint_bjd":2454317.81333,"equilibrium_temperature_k":2000,"argument_of_periastron_deg":293},"designations":[{"catalog":"Exoplanet","designation":"WTS-2 b"},{"catalog":"Host star","designation":"WTS-2"}],"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."}