{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T09:32:49.413Z","years_from_j2000":26.68,"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-54515-b","name":"HIP 54515 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":270.09042254361293,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":167.3066308,"dec_deg":-1.3332838,"epoch_ra_deg":167.649981,"epoch_dec_deg":-1.478785,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 54515","semi_major_axis_km":3710027193.3599997,"periapsis_km":null,"mass_kg":3.3596805415693957e+28,"mass_msun":0.0168963,"constellation":"Leo","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/hip-54515-b","radius_km":77812.82,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 54515","host_v_mag":6.807,"eccentricity":0.42,"uncertainties":{"mass_kg":[9.300810538807931e+27,1.4425746958151076e+28],"distance_ly":[1.1813384000900446,1.1917754041769804],"eccentricity":[0.14,0.13],"host_mass_solar":[0.2,0.19],"inclination_deg":[5.9,6.7],"host_radius_solar":[0.037732,0.061655],"host_temperature_k":[340,500],"semi_major_axis_km":[703109992.29,1077104669.04],"orbital_period_days":[8800,15000],"argument_of_periastron_deg":[150,56]},"host_mass_solar":1.9,"inclination_deg":129.6,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":1.64915,"planets_in_system":1,"discovery_facility":"Subaru Telescope","host_spectral_type":"A5 V","host_temperature_k":8100,"orbital_period_days":33000,"periastron_epoch_bjd":2470981,"equilibrium_temperature_k":100.72,"argument_of_periastron_deg":214},"designations":[{"catalog":"Exoplanet","designation":"HIP 54515 b"},{"catalog":"Host star","designation":"HIP 54515"}],"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."}