{"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":"2026-09-08T15:21:06.970Z","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":"moa-2011-blg-028l-b","name":"MOA-2011-BLG-028L 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":24070.340675495663,"distance_method":"NASA Exoplanet Archive sy_dist (Skowron+ 2016, 2016ApJ...820....4S)","ra_deg":270.854,"dec_deg":-29.2134167,"epoch_ra_deg":271.281962,"epoch_dec_deg":-29.212943,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"MOA-2011-BLG-028L","semi_major_axis_km":619335184.698,"periapsis_km":null,"mass_kg":1.791650360337414e+26,"mass_msun":0.0000901047,"constellation":"Sagittarius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/moa-2011-blg-028l-b","radius_km":38204.819,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"MOA-2011-BLG-028L","uncertainties":{"mass_kg":[7.166601441349655e+25,9.555468588466207e+25],"distance_ly":[2022.1695418438092,1696.0131641270657],"host_mass_solar":[0.3,0.35],"semi_major_axis_km":[95742637.248,95742637.248]},"host_mass_solar":0.75,"stars_in_system":1,"discovery_method":"Microlensing","planets_in_system":1,"discovery_facility":"MOA"},"designations":[{"catalog":"Exoplanet","designation":"MOA-2011-BLG-028L b"},{"catalog":"Host star","designation":"MOA-2011-BLG-028L"}],"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."}