{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T18:29:04.098Z","years_from_j2000":26.681,"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":"hip-77900-b","name":"HIP 77900 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":492.0460345510334,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":238.6253901,"dec_deg":-27.3387434,"epoch_ra_deg":239.035269,"epoch_dec_deg":-27.418117,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 77900","semi_major_axis_km":496515332853.3,"periapsis_km":null,"mass_kg":3.986061659489113e+28,"mass_msun":0.0200465,"constellation":"Scorpius","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/hip-77900-b","radius_km":77175.01000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 77900","host_v_mag":6.15,"uncertainties":{"mass_kg":[1.8981245997567207e+27,1.8981245997567207e+27],"distance_ly":[8.948100222658855,8.948100222658855],"host_temperature_k":[95,95],"semi_major_axis_km":[4188740379.5999994,4188740379.5999994]},"stars_in_system":1,"discovery_method":"Imaging","planets_in_system":1,"discovery_facility":"European Space Agency (ESA) Gaia Satellite","host_temperature_k":13646,"equilibrium_temperature_k":2507},"designations":[{"catalog":"Exoplanet","designation":"HIP 77900 b"},{"catalog":"Host star","designation":"HIP 77900"}],"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."}