{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T08:52:35.992Z","years_from_j2000":26.666,"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-192579","name":"HD 192579","class":"b9_blue_white_star","category":"star","object_type":"B9 blue-white star","mag":7.01,"mag_band":"V","abs_mag":-1.116,"abs_mag_band":"V","distance_ly":1376.1871555454265,"distance_method":"parallax","ra_deg":303.413325,"dec_deg":46.711862,"epoch_ra_deg":303.623513,"epoch_dec_deg":46.792483,"epoch_moved_arcsec":0.118,"pm_ra_mas_yr":3.53,"pm_dec_mas_yr":2.67,"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-192579","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20136+4644","companions":[{"measured":2023,"magnitude":14.2,"components":"CG","discoverer_code":"BU 1483","separation_arcsec":37.5,"position_angle_deg":95},{"measured":2015,"magnitude":12.26,"components":"CI","discoverer_code":"BU 1483","separation_arcsec":60.2,"position_angle_deg":136},{"measured":2014,"magnitude":12.6,"components":"CH","discoverer_code":"BU 1483","separation_arcsec":60.6,"position_angle_deg":62}],"mass_solar":4.105,"radius_solar":3.281,"spectral_type":"B9","color_index_bv":-0.133,"luminosity_solar":243.4445183692199,"radial_velocity_km_s":-3.7,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.041,"surface_temperature_k":13949,"proper_motion_ra_mas_yr":3.53,"proper_motion_dec_mas_yr":2.67,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":372.8923},"designations":[{"catalog":"HD","designation":"HD 192579"},{"catalog":"HIP","designation":"HIP 99676"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}