{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T19:25:37.838Z","years_from_j2000":26.673,"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-73941","name":"HD 73941","class":"a3iii_iv_white_giant","category":"star","object_type":"A3III/IV white giant","mag":7.25,"mag_band":"V","abs_mag":1.531,"abs_mag_band":"V","distance_ly":454.2569043160161,"distance_method":"parallax","ra_deg":130.17248999999998,"dec_deg":-12.169063,"epoch_ra_deg":130.491298,"epoch_dec_deg":-12.263991,"epoch_moved_arcsec":0.963,"pm_ra_mas_yr":-34.45,"pm_dec_mas_yr":10.76,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-73941","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08407-1210","age_years":675625600,"companions":[{"measured":2021,"magnitude":8.07,"components":null,"discoverer_code":"STF1260","separation_arcsec":5.3,"position_angle_deg":301}],"mass_solar":1.744,"radius_solar":1.74,"spectral_type":"A3III/IV","color_index_bv":0.266,"luminosity_solar":21.26179859862522,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.093,"surface_temperature_k":7978,"proper_motion_ra_mas_yr":-34.45,"proper_motion_dec_mas_yr":10.76,"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":11.1537},"designations":[{"catalog":"HD","designation":"HD 73941"},{"catalog":"HIP","designation":"HIP 42574"}],"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."}