{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T11:13:42.815Z","years_from_j2000":26.686,"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-133800","name":"HD 133800","class":"a6vka0_5ma0_5_lb_white_main_sequence_star","category":"star","object_type":"A6VkA0.5mA0.5_lB white main-sequence star","mag":6.41,"mag_band":"V","abs_mag":1.118,"abs_mag_band":"V","distance_ly":373.17671191027773,"distance_method":"parallax","ra_deg":226.70442,"dec_deg":-16.484361,"epoch_ra_deg":227.080189,"epoch_dec_deg":-16.588404,"epoch_moved_arcsec":1.722,"pm_ra_mas_yr":-62.33,"pm_dec_mas_yr":-16.71,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Libra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-133800","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"15068-1629","age_years":776467860,"companions":[{"measured":2015,"magnitude":13,"components":"AB","discoverer_code":"BUP 160","separation_arcsec":11.4,"position_angle_deg":274},{"measured":2016,"magnitude":12.9,"components":"AC","discoverer_code":"BUP 160","separation_arcsec":29.9,"position_angle_deg":230}],"mass_solar":2.126,"radius_solar":2.912,"spectral_type":"A6VkA0.5mA0.5_lB","color_index_bv":0.162,"luminosity_solar":31.102836686851422,"radial_velocity_km_s":-50.4,"spectral_type_source":"SIMBAD (2020MNRAS.499.2701M, quality C)","surface_gravity_log_g":3.651,"surface_temperature_k":7996,"proper_motion_ra_mas_yr":-62.33,"proper_motion_dec_mas_yr":-16.71,"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":30.9376},"designations":[{"catalog":"HD","designation":"HD 133800"},{"catalog":"HIP","designation":"HIP 73953"}],"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."}