{"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":"2026-09-08T19:46:56.726Z","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-2018-blg-0029l-b","name":"KMT-2018-BLG-0029L 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":11024.085566825928,"distance_method":"NASA Exoplanet Archive sy_dist (Gould+ 2020, 2020JKAS...53....9G)","ra_deg":264.469458,"dec_deg":-27.9847,"epoch_ra_deg":264.892826,"epoch_dec_deg":-28.000876,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KMT-2018-BLG-0029L","semi_major_axis_km":638782907.8889999,"periapsis_km":null,"mass_kg":4.532875411653657e+25,"mass_msun":0.0000227965,"constellation":"Ophiuchus","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/kmt-2018-blg-0029l-b","radius_km":17029.527000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KMT-2018-BLG-0029L","uncertainties":{"mass_kg":[4.120795828776051e+24,4.4791259008435344e+24],"distance_ly":[848.0065820635328,717.5440309768355],"host_mass_solar":[0.12,0.1],"semi_major_axis_km":[34407510.261,31415552.846999995]},"host_mass_solar":1.14,"stars_in_system":1,"discovery_method":"Microlensing","planets_in_system":1,"discovery_facility":"KMTNet"},"designations":[{"catalog":"Exoplanet","designation":"KMT-2018-BLG-0029L b"},{"catalog":"Host star","designation":"KMT-2018-BLG-0029L"}],"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."}