{"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":"2026-09-08T02:27:06.565Z","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-131181","name":"HD 131181","class":"g2v_yellow_main_sequence_star","category":"star","object_type":"G2V yellow main-sequence star","mag":8.94,"mag_band":"V","abs_mag":1.945,"abs_mag_band":"V","distance_ly":817.4346401546317,"distance_method":"parallax","ra_deg":223.0803,"dec_deg":-9.953136,"epoch_ra_deg":223.442324,"epoch_dec_deg":-10.063735,"epoch_moved_arcsec":0.341,"pm_ra_mas_yr":-6.91,"pm_dec_mas_yr":-10.74,"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-131181","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"14523-0957","companions":[{"measured":2025,"magnitude":9.9,"components":"Aa,Ab","discoverer_code":"YSC 220","separation_arcsec":0.2,"position_angle_deg":220},{"measured":2025,"magnitude":11.57,"components":"AB","discoverer_code":"HDS2098","separation_arcsec":0.9,"position_angle_deg":67}],"spectral_type":"G2V","color_index_bv":0.63,"luminosity_solar":14.52111617587742,"variable_mag_max":8.846,"variable_mag_min":8.986,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","proper_motion_ra_mas_yr":-6.91,"proper_motion_dec_mas_yr":-10.74},"designations":[{"catalog":"HD","designation":"HD 131181"},{"catalog":"HIP","designation":"HIP 72745"}],"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."}