{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T12:49:17.749Z","years_from_j2000":26.669,"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-76566","name":"IY Vel","class":"b3iv_blue_white_subgiant","category":"star","object_type":"B3IV blue-white subgiant","mag":6.26,"mag_band":"V","abs_mag":-1.583,"abs_mag_band":"V","distance_ly":1207.9866807750136,"distance_method":"parallax","ra_deg":133.83003000000002,"dec_deg":-45.04167,"epoch_ra_deg":134.064333,"epoch_dec_deg":-45.143682,"epoch_moved_arcsec":0.415,"pm_ra_mas_yr":-13.12,"pm_dec_mas_yr":8.39,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-76566","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08553-4503","companions":[{"measured":2015,"magnitude":12.64,"components":null,"discoverer_code":"HJ 4153","separation_arcsec":33.3,"position_angle_deg":131}],"mass_solar":4.883,"radius_solar":4.978,"spectral_type":"B3IV","color_index_bv":-0.152,"luminosity_solar":374.2829122408053,"variable_mag_max":6.229,"variable_mag_min":6.289,"radial_velocity_km_s":22,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","variable_designation":"IY Vel","surface_gravity_log_g":3.743,"surface_temperature_k":14215,"proper_motion_ra_mas_yr":-13.12,"proper_motion_dec_mas_yr":8.39,"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","bolometric_luminosity_solar":893.2371},"designations":[{"catalog":"HD","designation":"HD 76566"},{"catalog":"HIP","designation":"HIP 43807"},{"catalog":"HR","designation":"HR 3562"},{"catalog":"Variable star","designation":"IY Vel"}],"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."}