{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T07:07:40.361Z","years_from_j2000":26.685,"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-143600","name":"HD 143600","class":"b9vn_blue_white_main_sequence_star","category":"star","object_type":"B9Vn blue-white main-sequence star","mag":7.33,"mag_band":"V","abs_mag":1.505,"abs_mag_band":"V","distance_ly":476.8367103453463,"distance_method":"parallax","ra_deg":240.556485,"dec_deg":-22.68756,"epoch_ra_deg":240.954876,"epoch_dec_deg":-22.762827,"epoch_moved_arcsec":0.681,"pm_ra_mas_yr":-11.43,"pm_dec_mas_yr":-22.83,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Scorpius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-143600","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16022-2241","companions":[{"measured":2018,"magnitude":10.96,"components":"AC","discoverer_code":"LAF  94","separation_arcsec":0.2,"position_angle_deg":309},{"measured":2020,"magnitude":19.4,"components":"Aa,Ab","discoverer_code":"BNV  10","separation_arcsec":0.3,"position_angle_deg":183},{"measured":2008,"magnitude":17.91,"components":"AD","discoverer_code":"LAF  94","separation_arcsec":6.2,"position_angle_deg":91},{"measured":2015,"magnitude":14.62,"components":"AB","discoverer_code":"KOU  46","separation_arcsec":12,"position_angle_deg":48}],"spectral_type":"B9Vn","color_index_bv":0.079,"luminosity_solar":21.77709772353159,"radial_velocity_km_s":-5,"spectral_type_source":"SIMBAD (2020MNRAS.499.2701M, quality C)","proper_motion_ra_mas_yr":-11.43,"proper_motion_dec_mas_yr":-22.83},"designations":[{"catalog":"HD","designation":"HD 143600"},{"catalog":"HIP","designation":"HIP 78549"}],"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."}