{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T19:31:47.790Z","years_from_j2000":26.681,"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-200964-b","name":"HD 200964 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":236.76409002489385,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":316.6664183,"dec_deg":3.8033357,"epoch_ra_deg":317.00363,"epoch_dec_deg":3.910857,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 200964","semi_major_axis_km":234120667.64549997,"periapsis_km":null,"mass_kg":3.035116447358794e+27,"mass_msun":0.0015264,"constellation":"Equuleus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/hd-200964-b","radius_km":86104.35,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 200964","host_v_mag":6.48605,"eccentricity":0.087,"uncertainties":{"mass_kg":[1.2717498559914897e+26,1.2717498559914897e+26],"distance_ly":[0.7878307303747937,0.7878307303747937],"eccentricity":[0.035,0.035],"semi_major_axis_km":[12416623.268099999,12416623.268099999],"orbital_period_days":[3.8,3.8],"argument_of_periastron_deg":[30,30]},"host_mass_solar":1.39,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":4.92,"planets_in_system":2,"discovery_facility":"Lick Observatory","host_spectral_type":"G8 IV","host_temperature_k":4982,"orbital_period_days":606.3,"periastron_epoch_bjd":2455350,"equilibrium_temperature_k":425.95,"argument_of_periastron_deg":133},"designations":[{"catalog":"Exoplanet","designation":"HD 200964 b"},{"catalog":"Host star","designation":"HD 200964"}],"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."}