{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T16:54:41.963Z","years_from_j2000":26.684,"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":"ogle-2018-blg-0977l-b","name":"OGLE-2018-BLG-0977L 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 (Hwang+ 2022, 2022AJ....163...43H)","ra_deg":268.506125,"dec_deg":-30.6048056,"epoch_ra_deg":268.938827,"epoch_dec_deg":-30.610444,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"OGLE-2018-BLG-0977L","semi_major_axis_km":299195741.4,"periapsis_km":null,"mass_kg":3.8221874353864827e+25,"mass_msun":0.0000192223,"constellation":"Scorpius","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/ogle-2018-blg-0977l-b","radius_km":15371.221000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"OGLE-2018-BLG-0977L","uncertainties":{"mass_kg":[2.2097021110828105e+25,3.105527291251517e+25],"distance_ly":[7175.440309768355,3913.876532600921],"host_mass_solar":[0.27,0.38],"semi_major_axis_km":[74798935.35,89758722.41999999]},"host_mass_solar":0.47,"stars_in_system":1,"discovery_method":"Microlensing","planets_in_system":1,"discovery_facility":"OGLE"},"designations":[{"catalog":"Exoplanet","designation":"OGLE-2018-BLG-0977L b"},{"catalog":"Host star","designation":"OGLE-2018-BLG-0977L"}],"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."}