{"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":"2026-09-02T20:34:30.594Z","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-35673","name":"HD 35673","class":"b9v_blue_white_main_sequence_star","category":"star","object_type":"B9V blue-white main-sequence star","mag":6.52,"mag_band":"V","abs_mag":0.702,"abs_mag_band":"V","distance_ly":475.44663186351755,"distance_method":"parallax","ra_deg":81.630075,"dec_deg":2.935907,"epoch_ra_deg":81.981686,"epoch_dec_deg":2.959447,"epoch_moved_arcsec":0.164,"pm_ra_mas_yr":-1.89,"pm_dec_mas_yr":-5.85,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-35673","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05265+0256","companions":[{"measured":2021,"magnitude":8.59,"components":"AB","discoverer_code":"STF 712","separation_arcsec":3.2,"position_angle_deg":67},{"measured":2016,"magnitude":10.91,"components":"AC","discoverer_code":"KPR   2","separation_arcsec":135.6,"position_angle_deg":71}],"mass_solar":3.059,"radius_solar":2.387,"spectral_type":"B9V","color_index_bv":-0.001,"luminosity_solar":45.62469770768503,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.033,"surface_temperature_k":12075,"proper_motion_ra_mas_yr":-1.89,"proper_motion_dec_mas_yr":-5.85,"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":98.0132},"designations":[{"catalog":"HD","designation":"HD 35673"},{"catalog":"HIP","designation":"HIP 25443"}],"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."}