{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T14:16:38.978Z","years_from_j2000":26.67,"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-159481","name":"HD 159481","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":7.4,"mag_band":"V","abs_mag":2.603,"abs_mag_band":"V","distance_ly":297.04594253639095,"distance_method":"parallax","ra_deg":263.702205,"dec_deg":6.023857,"epoch_ra_deg":264.030675,"epoch_dec_deg":6.005085,"epoch_moved_arcsec":1.862,"pm_ra_mas_yr":11.72,"pm_dec_mas_yr":-68.81,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-159481","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17348+0601","companions":[{"measured":2024,"magnitude":9.23,"components":"Aa,Ab","discoverer_code":"HDS2481","separation_arcsec":0.2,"position_angle_deg":276},{"measured":2015,"magnitude":10.32,"components":"AB","discoverer_code":"STF2185","separation_arcsec":27.2,"position_angle_deg":5},{"measured":2015,"magnitude":15.7,"components":"AG","discoverer_code":"PWS  16","separation_arcsec":59.4,"position_angle_deg":308},{"measured":2018,"magnitude":8.43,"components":"AC","discoverer_code":"STF2185","separation_arcsec":93.2,"position_angle_deg":253},{"measured":2015,"magnitude":11.49,"components":"AK","discoverer_code":"PWS  16","separation_arcsec":153.2,"position_angle_deg":17},{"measured":2015,"magnitude":13.66,"components":"AJ","discoverer_code":"PWS  16","separation_arcsec":161.1,"position_angle_deg":340},{"measured":2015,"magnitude":13,"components":"AI","discoverer_code":"PWS  16","separation_arcsec":187.2,"position_angle_deg":340},{"measured":2015,"magnitude":11.43,"components":"AH","discoverer_code":"PWS  16","separation_arcsec":188.3,"position_angle_deg":335},{"measured":2012,"magnitude":11.98,"components":"AF","discoverer_code":"PWS  16","separation_arcsec":212.7,"position_angle_deg":193}],"spectral_type":"F8","color_index_bv":0.518,"luminosity_solar":7.921364541528511,"radial_velocity_km_s":2.3,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_temperature_k":5768,"proper_motion_ra_mas_yr":11.72,"proper_motion_dec_mas_yr":-68.81,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 159481"},{"catalog":"HIP","designation":"HIP 86024"}],"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."}