{"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":"2026-09-06T11:06:56.248Z","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":"kaus-australis","name":"Kaus Australis","class":"b9ivp_lb_blue_white_subgiant","category":"star","object_type":"B9IVp_lB? blue-white subgiant","mag":1.79,"mag_band":"V","abs_mag":-1.424,"abs_mag_band":"V","distance_ly":143.3023492082724,"distance_method":"parallax","ra_deg":276.04302,"dec_deg":-34.384616,"epoch_ra_deg":276.48875,"epoch_dec_deg":-34.371491,"epoch_moved_arcsec":3.474,"pm_ra_mas_yr":-39.61,"pm_dec_mas_yr":-124.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/kaus-australis","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18242-3423","companions":[{"measured":1999,"magnitude":8.4,"components":"AC","discoverer_code":"GOL   2","separation_arcsec":2.4,"position_angle_deg":142},{"measured":2022,"magnitude":14.3,"components":"AB","discoverer_code":"SEE 351","separation_arcsec":39.9,"position_angle_deg":314},{"measured":2022,"magnitude":9.03,"components":"AD","discoverer_code":"TOK 617","separation_arcsec":862.9,"position_angle_deg":36}],"spectral_type":"B9IVp_lB?","color_index_bv":-0.031,"luminosity_solar":323.2957533680941,"radial_velocity_km_s":-15,"spectral_type_source":"SIMBAD (1975ApJ...197..137S, quality C)","surface_temperature_k":9225,"proper_motion_ra_mas_yr":-39.61,"proper_motion_dec_mas_yr":-124.05,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"20 Epsilon Sgr"},{"catalog":"Common name","designation":"Kaus Australis"},{"catalog":"HD","designation":"HD 169022"},{"catalog":"HIP","designation":"HIP 90185"},{"catalog":"HR","designation":"HR 6879"}],"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."}