{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T21:22:21.965Z","years_from_j2000":26.665,"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":"bellatrix","name":"Bellatrix","class":"b2iii_blue_white_giant","category":"star","object_type":"B2III blue-white giant","mag":1.64,"mag_band":"V","abs_mag":-2.804,"abs_mag_band":"V","distance_ly":252.4430794144931,"distance_method":"parallax","ra_deg":81.282765,"dec_deg":6.349702,"epoch_ra_deg":81.643113,"epoch_dec_deg":6.374086,"epoch_moved_arcsec":0.424,"pm_ra_mas_yr":-8.75,"pm_dec_mas_yr":-13.28,"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/bellatrix","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05251+0621","companions":[{"measured":2010,"magnitude":19.9,"components":"AC","discoverer_code":"JNN   4","separation_arcsec":5.8,"position_angle_deg":8},{"measured":2010,"magnitude":19.2,"components":"AD","discoverer_code":"JNN   4","separation_arcsec":10.4,"position_angle_deg":246},{"measured":2010,"magnitude":20.1,"components":"AE","discoverer_code":"JNN   4","separation_arcsec":12.4,"position_angle_deg":52},{"measured":2009,"magnitude":13.13,"components":"AB","discoverer_code":"BUP  78","separation_arcsec":178,"position_angle_deg":144}],"wikidata_id":"Q13066","also_known_as":["Gamma Orionis","γ Ori","γ Orionis"],"spectral_type":"B2III","color_index_bv":-0.224,"luminosity_solar":1152.3913771994878,"metallicity_fe_h":-0.25,"wikipedia_article":"Bellatrix","radial_velocity_km_s":18,"spectral_type_source":"SIMBAD (2024A&A...690A.176N, quality C)","surface_gravity_log_g":3.86,"surface_temperature_k":21770,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-8.75,"proper_motion_dec_mas_yr":-13.28,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"24 Gamma Ori"},{"catalog":"Common name","designation":"Bellatrix"},{"catalog":"HD","designation":"HD 35468"},{"catalog":"HIP","designation":"HIP 25336"},{"catalog":"HR","designation":"HR 1790"},{"catalog":"IRAS","designation":"IRAS 05224+0618"}],"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."}