{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T11:23:22.311Z","years_from_j2000":26.686,"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-79431-b","name":"HIP 79431 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":47.39834943530802,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":243.1742467,"dec_deg":-18.8764247,"epoch_ra_deg":243.563998,"epoch_dec_deg":-18.945548,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 79431","semi_major_axis_km":53855233.45199999,"periapsis_km":null,"mass_kg":3.985914417481983e+27,"mass_msun":0.00200457,"constellation":"Scorpius","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/hip-79431-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 79431","host_v_mag":11.394,"eccentricity":0.29,"uncertainties":{"distance_ly":[0.08447450182863654,0.08447450182863654],"eccentricity":[0.02,0.02],"host_mass_solar":[0.05,0.05],"host_radius_solar":[0.014134,0.014134],"host_temperature_k":[1000,1000],"orbital_period_days":[0.7,0.7],"argument_of_periastron_deg":[3.2,3.2]},"host_mass_solar":0.49,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.478625,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"M3 V","host_temperature_k":3191,"orbital_period_days":111.7,"periastron_epoch_bjd":2454980.3,"equilibrium_temperature_k":177.42,"argument_of_periastron_deg":287.4},"designations":[{"catalog":"Exoplanet","designation":"HIP 79431 b"},{"catalog":"Host star","designation":"HIP 79431"}],"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."}