{"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":"2026-09-08T13:36:08.111Z","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":"hd-199580","name":"HD 199580","class":"k1iv_orange_subgiant","category":"star","object_type":"K1IV orange subgiant","mag":7.21,"mag_band":"V","abs_mag":2.506,"abs_mag_band":"V","distance_ly":284.60405519563034,"distance_method":"parallax","ra_deg":314.1999,"dec_deg":42.895664,"epoch_ra_deg":314.445284,"epoch_dec_deg":43.000202,"epoch_moved_arcsec":8.377,"pm_ra_mas_yr":218.84,"pm_dec_mas_yr":225.06,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-199580","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20568+4254","age_years":1819724600,"companions":[{"measured":2002,"magnitude":10.16,"components":"AB","discoverer_code":"ENG  77","separation_arcsec":100,"position_angle_deg":328},{"measured":2012,"magnitude":9.13,"components":"AC","discoverer_code":"ENG  77","separation_arcsec":125.8,"position_angle_deg":17}],"mass_solar":1.72,"radius_solar":4.713,"spectral_type":"K1IV","color_index_bv":0.96,"luminosity_solar":8.661637419723034,"metallicity_fe_h":0.03,"radial_velocity_km_s":-19.4,"spectral_type_source":"SIMBAD (1955ApJS....2..195R, quality C)","surface_gravity_log_g":3.052,"surface_temperature_k":4920,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":218.84,"proper_motion_dec_mas_yr":225.06,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":12.4713},"designations":[{"catalog":"HD","designation":"HD 199580"},{"catalog":"HIP","designation":"HIP 103392"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"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."}