{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T00:16:31.437Z","years_from_j2000":26.668,"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-43525","name":"75 Ori","class":"a2v_white_main_sequence_star","category":"star","object_type":"A2V white main-sequence star","mag":5.39,"mag_band":"V","abs_mag":1.192,"abs_mag_band":"V","distance_ly":225.40178029437564,"distance_method":"parallax","ra_deg":94.27758,"dec_deg":9.94239,"epoch_ra_deg":94.647753,"epoch_dec_deg":9.93262,"epoch_moved_arcsec":1.602,"pm_ra_mas_yr":5.1,"pm_dec_mas_yr":-59.86,"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-43525","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06171+0957","companions":[{"measured":2024,"magnitude":6.1,"components":"Aa,Ab","discoverer_code":"FIN 331","separation_arcsec":0.1,"position_angle_deg":204},{"measured":2011,"magnitude":11.77,"components":"AB","discoverer_code":"BU   96","separation_arcsec":62.9,"position_angle_deg":263},{"measured":2000,"magnitude":13.38,"components":"AG","discoverer_code":"SLE 859","separation_arcsec":91.7,"position_angle_deg":205},{"measured":2000,"magnitude":11.14,"components":"AF","discoverer_code":"SLE 859","separation_arcsec":105,"position_angle_deg":99},{"measured":2000,"magnitude":9.6,"components":"AC","discoverer_code":"BU   96","separation_arcsec":114.5,"position_angle_deg":159},{"measured":2011,"magnitude":10.08,"components":"AE","discoverer_code":"SLE 859","separation_arcsec":114.6,"position_angle_deg":349},{"measured":2000,"magnitude":9.6,"components":"AD","discoverer_code":"J   408","separation_arcsec":116.4,"position_angle_deg":162}],"spectral_type":"A2V","color_index_bv":0.106,"luminosity_solar":29.053603143031467,"radial_velocity_km_s":12,"spectral_type_source":"SIMBAD (quality C)","surface_temperature_k":8554,"proper_motion_ra_mas_yr":5.1,"proper_motion_dec_mas_yr":-59.86,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"75 Ori"},{"catalog":"HD","designation":"HD 43525"},{"catalog":"HIP","designation":"HIP 29850"},{"catalog":"HR","designation":"HR 2247"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}