{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T21:06:20.297Z","years_from_j2000":26.679,"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-130819","name":"8 α¹ Lib","class":"f3v_yellow_white_main_sequence_star","category":"star","object_type":"F3V yellow-white main-sequence star","mag":5.15,"mag_band":"V","abs_mag":3.343,"abs_mag_band":"V","distance_ly":74.9438863153756,"distance_method":"parallax","ra_deg":222.671595,"dec_deg":-15.997237,"epoch_ra_deg":223.043506,"epoch_dec_deg":-16.108858,"epoch_moved_arcsec":3.958,"pm_ra_mas_yr":-135.93,"pm_dec_mas_yr":-59.47,"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-130819","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"14509-1603","companions":[{"measured":2025,"magnitude":9.4,"components":"Ba,Bb","discoverer_code":"BEU  19","separation_arcsec":0.2,"position_angle_deg":55},{"measured":2016,"magnitude":12.48,"components":"BC","discoverer_code":"AOT  53","separation_arcsec":109.7,"position_angle_deg":236}],"spectral_type":"F3V","uncertainties":{"metallicity_fe_h":[0.056,0.056]},"color_index_bv":0.401,"luminosity_solar":4.00682154182211,"metallicity_fe_h":-0.115,"radial_velocity_km_s":-23.5,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality C)","surface_gravity_log_g":4.14,"surface_temperature_k":6632,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-135.93,"proper_motion_dec_mas_yr":-59.47,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"8 Alpha1 Lib"},{"catalog":"Gliese","designation":"Gl 563.4"},{"catalog":"HD","designation":"HD 130819"},{"catalog":"HIP","designation":"HIP 72603"},{"catalog":"HR","designation":"HR 5530"}],"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."}