{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T20:35:10.792Z","years_from_j2000":26.67,"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-73503","name":"HD 73503","class":"a0v_white_main_sequence_star","category":"star","object_type":"A0V white main-sequence star","mag":8.35,"mag_band":"V","abs_mag":-0.889,"abs_mag_band":"V","distance_ly":2296.876055601247,"distance_method":"parallax","ra_deg":129.098385,"dec_deg":-53.036481,"epoch_ra_deg":129.285986,"epoch_dec_deg":-53.128991,"epoch_moved_arcsec":0.856,"pm_ra_mas_yr":-23.14,"pm_dec_mas_yr":22.22,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-73503","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08364-5302","companions":[{"measured":2016,"magnitude":12.7,"components":"AB","discoverer_code":"RST2570","separation_arcsec":1.2,"position_angle_deg":134},{"measured":1991,"magnitude":11.54,"components":"AC","discoverer_code":"HDS1237","separation_arcsec":16.6,"position_angle_deg":74}],"mass_solar":2.469,"radius_solar":1.829,"spectral_type":"A0V","color_index_bv":0.04,"luminosity_solar":197.5149622060758,"radial_velocity_km_s":22,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":4.206,"surface_temperature_k":10742,"proper_motion_ra_mas_yr":-23.14,"proper_motion_dec_mas_yr":22.22,"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":38.805},"designations":[{"catalog":"HD","designation":"HD 73503"},{"catalog":"HIP","designation":"HIP 42216"}],"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."}