{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T00:24:23.713Z","years_from_j2000":26.685,"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":"hd-102329-c","name":"HD 102329 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":708.1083269694901,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":176.6941567,"dec_deg":3.4742143,"epoch_ra_deg":177.039056,"epoch_dec_deg":3.324975,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 102329","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":2.885163852398604e+27,"mass_msun":0.00145099,"constellation":"Virgo","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hd-102329-c","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 102329","host_v_mag":7.88,"eccentricity":0.209,"uncertainties":{"mass_kg":[4.745335283550335e+26,5.6944023402604025e+26],"distance_ly":[10.0554011250072,10.345680301175102],"eccentricity":[0.202,0.231],"host_mass_solar":[0.15,0.15],"host_radius_solar":[0.1,0.1],"host_temperature_k":[44,44],"orbital_period_days":[53,79],"argument_of_periastron_deg":[74,165]},"host_mass_solar":1.3,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":6.3,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"K0 III","host_temperature_k":4830,"orbital_period_days":1123,"periastron_epoch_bjd":2454736,"argument_of_periastron_deg":21},"designations":[{"catalog":"Exoplanet","designation":"HD 102329 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."}