{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T09:05:09.884Z","years_from_j2000":26.672,"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-35173","name":"HD 35173","class":"b8_blue_white_star","category":"star","object_type":"B8 blue-white star","mag":7.27,"mag_band":"V","abs_mag":0.129,"abs_mag_band":"V","distance_ly":874.413833185369,"distance_method":"parallax","ra_deg":80.88225,"dec_deg":16.040494,"epoch_ra_deg":81.268697,"epoch_dec_deg":16.065912,"epoch_moved_arcsec":0.157,"pm_ra_mas_yr":1.42,"pm_dec_mas_yr":-5.7,"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-35173","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05235+1602","companions":[{"measured":2019,"magnitude":8.1,"components":"AB","discoverer_code":"STF 697","separation_arcsec":25.4,"position_angle_deg":287},{"measured":2015,"magnitude":10.83,"components":"AC","discoverer_code":"WAL  38","separation_arcsec":98.1,"position_angle_deg":284},{"measured":2016,"magnitude":13.89,"components":"AE","discoverer_code":"SMR  27","separation_arcsec":163.6,"position_angle_deg":289},{"measured":2015,"magnitude":10.07,"components":"AD","discoverer_code":"SMR   3","separation_arcsec":250,"position_angle_deg":285}],"spectral_type":"B8","color_index_bv":0.125,"luminosity_solar":77.33925780489973,"variable_mag_max":7.177,"variable_mag_min":7.287,"radial_velocity_km_s":21.6,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.08,"surface_temperature_k":14968,"proper_motion_ra_mas_yr":1.42,"proper_motion_dec_mas_yr":-5.7,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 35173"},{"catalog":"HIP","designation":"HIP 25207"}],"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."}