{"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":"2026-09-01T16:55:03.344Z","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-80951","name":"HD 80951","class":"a1v_white_main_sequence_star","category":"star","object_type":"A1V white main-sequence star","mag":5.28,"mag_band":"V","abs_mag":0.122,"abs_mag_band":"V","distance_ly":350.70584211110497,"distance_method":"parallax","ra_deg":139.35501,"dec_deg":-74.894313,"epoch_ra_deg":139.329838,"epoch_dec_deg":-75.005955,"epoch_moved_arcsec":0.954,"pm_ra_mas_yr":-16.33,"pm_dec_mas_yr":31.85,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Carina","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-80951","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09174-7454","companions":[{"measured":2014,"magnitude":6.6,"components":"AB","discoverer_code":"I    12","separation_arcsec":0.3,"position_angle_deg":260},{"measured":2015,"magnitude":9.55,"components":"AB,C","discoverer_code":"HJ 4206","separation_arcsec":7.1,"position_angle_deg":344},{"measured":2015,"magnitude":10.3,"components":"AB,D","discoverer_code":"HJ 4206","separation_arcsec":45.6,"position_angle_deg":354}],"spectral_type":"A1V","color_index_bv":0.021,"luminosity_solar":77.8394932626726,"radial_velocity_km_s":11,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality C)","proper_motion_ra_mas_yr":-16.33,"proper_motion_dec_mas_yr":31.85},"designations":[{"catalog":"HD","designation":"HD 80951"},{"catalog":"HIP","designation":"HIP 45581"},{"catalog":"HR","designation":"HR 3720"}],"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."}