{"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":"2026-09-01T01:57:21.606Z","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-50445","name":"HD 50445","class":"a3v_white_main_sequence_star","category":"star","object_type":"A3V white main-sequence star","mag":5.94,"mag_band":"V","abs_mag":2.23,"abs_mag_band":"V","distance_ly":180.0973548040091,"distance_method":"parallax","ra_deg":102.926775,"dec_deg":-36.23027,"epoch_ra_deg":103.16325,"epoch_dec_deg":-36.262183,"epoch_moved_arcsec":1.911,"pm_ra_mas_yr":-40.47,"pm_dec_mas_yr":-59.14,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Puppis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-50445","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06517-3614","age_years":694894700,"companions":[{"measured":2016,"magnitude":19.9,"components":"AE","discoverer_code":"EHR  10","separation_arcsec":8.3,"position_angle_deg":97},{"measured":2016,"magnitude":16.5,"components":"AB","discoverer_code":"EHR  10","separation_arcsec":13.3,"position_angle_deg":78},{"measured":2016,"magnitude":20.2,"components":"AD","discoverer_code":"EHR  10","separation_arcsec":13.8,"position_angle_deg":155},{"measured":2016,"magnitude":16,"components":"AC","discoverer_code":"EHR  10","separation_arcsec":14.6,"position_angle_deg":152},{"measured":2016,"magnitude":16.2,"components":"AF","discoverer_code":"EHR  10","separation_arcsec":19.6,"position_angle_deg":249}],"mass_solar":1.714,"radius_solar":1.753,"spectral_type":"A3V","color_index_bv":0.183,"luminosity_solar":11.168632477805607,"radial_velocity_km_s":4,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_gravity_log_g":3.998,"surface_temperature_k":7895,"proper_motion_ra_mas_yr":-40.47,"proper_motion_dec_mas_yr":-59.14,"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; Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":10.365},"designations":[{"catalog":"HD","designation":"HD 50445"},{"catalog":"HIP","designation":"HIP 32938"},{"catalog":"HR","designation":"HR 2558"}],"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."}