{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T18:02:20.467Z","years_from_j2000":26.654,"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-39330-b","name":"HIP 39330 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":118.7072229210305,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":120.6116831,"dec_deg":-46.3353155,"epoch_ra_deg":120.819602,"epoch_dec_deg":-46.409661,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 39330","semi_major_axis_km":755469247.035,"periapsis_km":null,"mass_kg":3.169868081593724e+27,"mass_msun":0.00159417,"constellation":"Puppis","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/hip-39330-b","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 39330","host_v_mag":7.52,"eccentricity":0.078,"uncertainties":{"mass_kg":[1.5184996798053766e+26,3.606436739537769e+26],"distance_ly":[0.14774883910568476,0.14774883910568476],"eccentricity":[0.078,0.053],"host_mass_solar":[0.04,0.04],"inclination_deg":[3.9,0.6],"host_radius_solar":[0.047371,0.073875],"host_temperature_k":[81,81],"semi_major_axis_km":[25431638.019,34407510.261],"orbital_period_days":[250,210]},"host_mass_solar":0.96,"inclination_deg":55,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.02786,"planets_in_system":1,"discovery_facility":"Multiple Facilities","host_spectral_type":"G5 V","host_temperature_k":5748,"orbital_period_days":4650,"equilibrium_temperature_k":125.05},"designations":[{"catalog":"Exoplanet","designation":"HIP 39330 b"},{"catalog":"Host star","designation":"HIP 39330"}],"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":"2026-08-27T16:03:54.983Z","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."}