{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T10:46:08.356Z","years_from_j2000":26.675,"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-181752","name":"HD 181752","class":"f5_yellow_white_star","category":"star","object_type":"F5 yellow-white star","mag":6.82,"mag_band":"V","abs_mag":2.834,"abs_mag_band":"V","distance_ly":204.48667641691173,"distance_method":"parallax","ra_deg":290.24953500000004,"dec_deg":19.145537,"epoch_ra_deg":290.545109,"epoch_dec_deg":19.195961,"epoch_moved_arcsec":2.32,"pm_ra_mas_yr":60.8,"pm_dec_mas_yr":62.2,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagitta","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-181752","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19210+1909","age_years":2114037000,"companions":[{"measured":2020,"magnitude":9.03,"components":"AB","discoverer_code":"STF2504","separation_arcsec":8.8,"position_angle_deg":281},{"measured":2015,"magnitude":12.17,"components":"AC","discoverer_code":"WAL 111","separation_arcsec":91.8,"position_angle_deg":101}],"mass_solar":1.392,"radius_solar":1.701,"spectral_type":"F5","color_index_bv":0.458,"luminosity_solar":6.4032432446894685,"radial_velocity_km_s":-47,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.086,"surface_temperature_k":6617,"proper_motion_ra_mas_yr":60.8,"proper_motion_dec_mas_yr":62.2,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":4.9553},"designations":[{"catalog":"HD","designation":"HD 181752"},{"catalog":"HIP","designation":"HIP 95116"}],"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."}