{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T16:12:13.123Z","years_from_j2000":26.667,"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-46150","name":"HD 46150","class":"o5v_f_z_blue_main_sequence_star","category":"star","object_type":"O5V((f))z blue main-sequence star","mag":6.75,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":97.981335,"dec_deg":4.942859,"epoch_ra_deg":98.338113,"epoch_dec_deg":4.92394,"epoch_moved_arcsec":0.036,"pm_ra_mas_yr":-1.19,"pm_dec_mas_yr":0.64,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Monoceros","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-46150","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06319+0457","companions":[{"measured":2011,"magnitude":13.65,"components":"AQ","discoverer_code":"SNA   2","separation_arcsec":2.1,"position_angle_deg":248},{"measured":2016,"magnitude":11.5,"components":"AB","discoverer_code":"GAN   3","separation_arcsec":3.5,"position_angle_deg":286},{"measured":2015,"magnitude":13.1,"components":"AL","discoverer_code":"MZA  19","separation_arcsec":10.4,"position_angle_deg":47},{"measured":2015,"magnitude":12.24,"components":"AD","discoverer_code":"GAN   3","separation_arcsec":12.6,"position_angle_deg":289},{"measured":2015,"magnitude":11.64,"components":"AE","discoverer_code":"GAN   3","separation_arcsec":13.2,"position_angle_deg":198},{"measured":2016,"magnitude":16.5,"components":"AC","discoverer_code":"GAN   3","separation_arcsec":20.1,"position_angle_deg":310},{"measured":2016,"magnitude":11.63,"components":"AF","discoverer_code":"SLE 293","separation_arcsec":45.5,"position_angle_deg":352},{"measured":2015,"magnitude":11.75,"components":"AG","discoverer_code":"SLE 293","separation_arcsec":48.9,"position_angle_deg":247},{"measured":2015,"magnitude":11.18,"components":"AJ","discoverer_code":"SLE 293","separation_arcsec":53.8,"position_angle_deg":110},{"measured":2015,"magnitude":9.39,"components":"AI","discoverer_code":"SLE 293","separation_arcsec":64.3,"position_angle_deg":235},{"measured":2015,"magnitude":12.77,"components":"AH","discoverer_code":"SLE 293","separation_arcsec":65.9,"position_angle_deg":254},{"measured":2015,"magnitude":10.74,"components":"AK","discoverer_code":"SLE 293","separation_arcsec":74.7,"position_angle_deg":137}],"radius_solar":12.812,"spectral_type":"O5V((f))z","color_index_bv":0.087,"radial_velocity_km_s":35.6,"spectral_type_source":"SIMBAD (2011ApJS..193...24S, quality C)","surface_gravity_log_g":3.425,"surface_temperature_k":24692,"proper_motion_ra_mas_yr":-1.19,"proper_motion_dec_mas_yr":0.64,"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"},"designations":[{"catalog":"HD","designation":"HD 46150"},{"catalog":"HIP","designation":"HIP 31130"}],"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."}