{"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":"2026-09-08T10:52:49.157Z","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":"kmt-2017-blg-1057l-b","name":"KMT-2017-BLG-1057L b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":21200.16455158832,"distance_method":"NASA Exoplanet Archive sy_dist (Gui+ 2024, 2024AJ....168...49G)","ra_deg":265.486,"dec_deg":-22.3351111,"epoch_ra_deg":265.891529,"epoch_dec_deg":-22.348663,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KMT-2017-BLG-1057L","semi_major_axis_km":353050974.85199994,"periapsis_km":null,"mass_kg":1.4034594489309741e+26,"mass_msun":0.000070582,"constellation":"Ophiuchus","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/kmt-2017-blg-1057l-b","radius_km":33102.33900000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KMT-2017-BLG-1057L","uncertainties":{"mass_kg":[7.166601441349655e+25,8.95825180168707e+25],"distance_ly":[5283.733319011243,2641.8666595056216],"host_mass_solar":[0.29,0.37],"semi_major_axis_km":[92750679.83399999,103222530.78299998]},"host_mass_solar":0.57,"stars_in_system":1,"discovery_method":"Microlensing","planets_in_system":1,"discovery_facility":"KMTNet"},"designations":[{"catalog":"Exoplanet","designation":"KMT-2017-BLG-1057L b"},{"catalog":"Host star","designation":"KMT-2017-BLG-1057L"}],"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."}