{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-09T00:41:07.752Z","years_from_j2000":26.687,"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":"kmt-2019-blg-1339l-b","name":"KMT-2019-BLG-1339L b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":19960.770316264698,"distance_method":"NASA Exoplanet Archive sy_dist (Han+ 2020, 2020AJ....160...64H)","ra_deg":265.743417,"dec_deg":-25.5739167,"epoch_ra_deg":266.159085,"epoch_dec_deg":-25.586794,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KMT-2019-BLG-1339L","semi_major_axis_km":321635422.00499994,"periapsis_km":null,"mass_kg":2.3709506435131776e+27,"mass_msun":0.00119239,"constellation":"Ophiuchus","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/kmt-2019-blg-1339l-b","radius_km":87379.97,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KMT-2019-BLG-1339L","uncertainties":{"mass_kg":[1.373598609592017e+27,1.9767875642389466e+27],"distance_ly":[5218.5020434678945,4109.570359230967],"host_mass_solar":[0.28,0.4],"semi_major_axis_km":[236364635.706,387458485.113]},"host_mass_solar":0.48,"stars_in_system":1,"discovery_method":"Microlensing","planets_in_system":1,"discovery_facility":"KMTNet"},"designations":[{"catalog":"Exoplanet","designation":"KMT-2019-BLG-1339L b"},{"catalog":"Host star","designation":"KMT-2019-BLG-1339L"}],"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."}