{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T10:05:38.522Z","years_from_j2000":26.68,"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-133574","name":"HD 133574","class":"a9_f0v_white_main_sequence_star","category":"star","object_type":"A9/F0V white main-sequence star","mag":8.71,"mag_band":"V","abs_mag":2.895,"abs_mag_band":"V","distance_ly":474.7545280300025,"distance_method":"parallax","ra_deg":226.57476,"dec_deg":-35.406194,"epoch_ra_deg":226.995288,"epoch_dec_deg":-35.510413,"epoch_moved_arcsec":0.741,"pm_ra_mas_yr":-20.1,"pm_dec_mas_yr":-19.16,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lupus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-133574","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"15063-3524","age_years":884483640,"companions":[{"measured":2019,"magnitude":11.2,"components":"Aa,Ab","discoverer_code":"VSP  44","separation_arcsec":0.1,"position_angle_deg":105},{"measured":2012,"magnitude":17.9,"components":"AB","discoverer_code":"JNN 200","separation_arcsec":3.7,"position_angle_deg":108}],"mass_solar":1.582,"radius_solar":1.673,"spectral_type":"A9/F0V","color_index_bv":0.34,"luminosity_solar":6.053408747539135,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality D)","surface_gravity_log_g":4.124,"surface_temperature_k":7437,"proper_motion_ra_mas_yr":-20.1,"proper_motion_dec_mas_yr":-19.16,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":7.5042},"designations":[{"catalog":"HD","designation":"HD 133574"},{"catalog":"HIP","designation":"HIP 73913"}],"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."}