{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T13:57:24.947Z","years_from_j2000":26.675,"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-131399","name":"HD 131399","class":"a1v_white_main_sequence_star","category":"star","object_type":"A1V white main-sequence star","mag":7.04,"mag_band":"V","abs_mag":2.083,"abs_mag_band":"V","distance_ly":319.7611034624735,"distance_method":"parallax","ra_deg":223.605465,"dec_deg":-34.142788,"epoch_ra_deg":224.0185,"epoch_dec_deg":-34.252493,"epoch_moved_arcsec":1.179,"pm_ra_mas_yr":-31.55,"pm_dec_mas_yr":-30.93,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Centaurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-131399","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"14544-3409","companions":[{"measured":2016,"magnitude":19.1,"components":"Aa,Ab","discoverer_code":"WGK   1","separation_arcsec":0.8,"position_angle_deg":194},{"measured":2016,"magnitude":8.5,"components":"A,Ba","discoverer_code":"I   226","separation_arcsec":3.1,"position_angle_deg":222},{"measured":2016,"magnitude":10.5,"components":"A,Bb","discoverer_code":"I   226","separation_arcsec":3.2,"position_angle_deg":222},{"measured":2019,"magnitude":11.16,"components":"AB","discoverer_code":"I   226","separation_arcsec":3.2,"position_angle_deg":222},{"measured":2016,"magnitude":13.2,"components":"AC","discoverer_code":"I   226","separation_arcsec":32.9,"position_angle_deg":201}],"radius_solar":1.497,"spectral_type":"A1V","color_index_bv":0.093,"luminosity_solar":12.78792262935846,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_gravity_log_g":4.321,"surface_temperature_k":10501,"proper_motion_ra_mas_yr":-31.55,"proper_motion_dec_mas_yr":-30.93,"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":24.2508},"designations":[{"catalog":"HD","designation":"HD 131399"},{"catalog":"HIP","designation":"HIP 72940"}],"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."}