{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T15:14:20.847Z","years_from_j2000":26.678,"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-26991","name":"HD 26991","class":"a1v_white_main_sequence_star","category":"star","object_type":"A1V white main-sequence star","mag":7.16,"mag_band":"V","abs_mag":1.825,"abs_mag_band":"V","distance_ly":380.5791570589369,"distance_method":"parallax","ra_deg":64.00599,"dec_deg":0.453897,"epoch_ra_deg":64.351466,"epoch_dec_deg":0.520927,"epoch_moved_arcsec":0.875,"pm_ra_mas_yr":24.25,"pm_dec_mas_yr":-22.07,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-26991","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04160+0027","companions":[{"measured":2021,"magnitude":9.26,"components":null,"discoverer_code":"STF 517","separation_arcsec":3.3,"position_angle_deg":7}],"mass_solar":2.29,"radius_solar":1.752,"spectral_type":"A1V","color_index_bv":0.086,"luminosity_solar":16.218100973589298,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.236,"surface_temperature_k":10140,"proper_motion_ra_mas_yr":24.25,"proper_motion_dec_mas_yr":-22.07,"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","bolometric_luminosity_solar":29.2164},"designations":[{"catalog":"HD","designation":"HD 26991"},{"catalog":"HIP","designation":"HIP 19892"}],"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."}