{"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":"2026-09-06T11:48:48.813Z","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-65407-c","name":"HIP 65407 c","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":201.50071477891495,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":201.087663,"dec_deg":48.8847322,"epoch_ra_deg":201.372416,"epoch_dec_deg":48.744494,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 65407","semi_major_axis_km":47272927.1412,"periapsis_km":null,"mass_kg":1.488137144921385e+27,"mass_msun":0.000748406,"constellation":"Canes Venatici","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/hip-65407-c","radius_km":88655.59000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 65407","host_v_mag":9.38,"eccentricity":0.12,"uncertainties":{"mass_kg":[1.0249924212468723e+26,1.0249924212468723e+26],"distance_ly":[0.34637807313518154,0.34735654226833174],"eccentricity":[0.04,0.04],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.027607,0.011421],"host_temperature_k":[50,50],"semi_major_axis_km":[1196782.9656,1196782.9656],"orbital_period_days":[0.08,0.08],"argument_of_periastron_deg":[25,25]},"host_mass_solar":0.93,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.952252,"planets_in_system":2,"discovery_facility":"Haute-Provence Observatory","host_spectral_type":"K0","host_temperature_k":5460,"orbital_period_days":67.3,"periastron_epoch_bjd":2457047,"equilibrium_temperature_k":457.04,"argument_of_periastron_deg":-19},"designations":[{"catalog":"Exoplanet","designation":"HIP 65407 c"},{"catalog":"Host star","designation":"HIP 65407"}],"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."}