{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T05:27:48.566Z","years_from_j2000":26.669,"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-46480","name":"8 Lyn","class":"g8iv_v_yellow_subgiant","category":"star","object_type":"G8IV-V yellow subgiant","mag":5.94,"mag_band":"V","abs_mag":2.358,"abs_mag_band":"V","distance_ly":169.7846162969834,"distance_method":"parallax","ra_deg":99.423,"dec_deg":61.481233,"epoch_ra_deg":100.035456,"epoch_dec_deg":61.456219,"epoch_moved_arcsec":9.189,"pm_ra_mas_yr":-208.21,"pm_dec_mas_yr":-274.56,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-46480","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06377+6129","companions":[{"measured":2016,"magnitude":13,"components":"AD","discoverer_code":"STU   4","separation_arcsec":113.2,"position_angle_deg":74},{"measured":2022,"magnitude":8.78,"components":"AB","discoverer_code":"STT 563","separation_arcsec":181.7,"position_angle_deg":72},{"measured":2022,"magnitude":6.99,"components":"AC","discoverer_code":"BUP  91","separation_arcsec":399.5,"position_angle_deg":91}],"spectral_type":"G8IV-V","uncertainties":{"metallicity_fe_h":[0.022,0.022]},"color_index_bv":0.899,"luminosity_solar":9.926588068710306,"metallicity_fe_h":-0.48,"radial_velocity_km_s":-46,"spectral_type_source":"SIMBAD (1986A&A...161..314C, quality D)","surface_gravity_log_g":2.93,"surface_temperature_k":4848,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-208.21,"proper_motion_dec_mas_yr":-274.56,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"8 Lyn"},{"catalog":"HD","designation":"HD 46480"},{"catalog":"HIP","designation":"HIP 31676"},{"catalog":"HR","designation":"HR 2394"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}