{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T23:15:09.030Z","years_from_j2000":26.682,"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-164509-b","name":"HD 164509 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":173.22784917653905,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":270.3800811,"dec_deg":0.1044685,"epoch_ra_deg":270.72404,"epoch_dec_deg":0.103614,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 164509","semi_major_axis_km":130150147.50899999,"periapsis_km":null,"mass_kg":8.408734122451194e+26,"mass_msun":0.000422887,"constellation":"Ophiuchus","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/hd-164509-b","radius_km":91206.83000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 164509","host_v_mag":8.1,"eccentricity":0.238,"uncertainties":{"mass_kg":[1.5754513141387112e+26,1.5754513141387112e+26],"distance_ly":[0.46477283824635934,0.46705593289037656],"eccentricity":[0.062,0.062],"host_mass_solar":[0.19,0.19],"host_radius_solar":[0.06,0.06],"semi_major_axis_km":[7629491.405699999,7629491.405699999],"orbital_period_days":[0.82,0.82],"argument_of_periastron_deg":[13,13]},"host_mass_solar":1.12,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":1.11,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G5","host_temperature_k":5859,"orbital_period_days":280.17,"periastron_epoch_bjd":2463741,"equilibrium_temperature_k":319.12,"argument_of_periastron_deg":326},"designations":[{"catalog":"Exoplanet","designation":"HD 164509 b"},{"catalog":"Host star","designation":"HD 164509"}],"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."}