{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T12:52:21.552Z","years_from_j2000":26.683,"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-81208-c-b","name":"HIP 81208 C b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":481.18828873684305,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":248.8075,"dec_deg":-35.7247583,"epoch_ra_deg":249.251723,"epoch_dec_deg":-35.78044,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 81208 C","semi_major_axis_km":3446734940.9279995,"periapsis_km":null,"mass_kg":2.809224407639947e+28,"mass_msun":0.014128,"constellation":"Scorpius","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/hip-81208-c-b","radius_km":78450.63,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 81208 C","uncertainties":{"mass_kg":[7.592498399026883e+26,7.592498399026883e+26],"distance_ly":[4.742313732001449,4.836899081539305],"host_mass_solar":[0.013,0.01],"semi_major_axis_km":[979866053.0849999,2076418445.316],"orbital_period_days":[40934,107260]},"host_mass_solar":0.135,"stars_in_system":3,"discovery_method":"Imaging","planets_in_system":1,"discovery_facility":"Paranal Observatory","host_spectral_type":"M","orbital_period_days":104100,"equilibrium_temperature_k":2050},"designations":[{"catalog":"Exoplanet","designation":"HIP 81208 C b"},{"catalog":"Host star","designation":"HIP 81208 C"}],"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."}