{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T13:46:40.530Z","years_from_j2000":26.678,"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-164922","name":"HD 164922","class":"g9v_yellow_main_sequence_star","category":"star","object_type":"G9V yellow main-sequence star","mag":7.01,"mag_band":"V","abs_mag":5.286,"abs_mag_band":"V","distance_ly":72.14252918716647,"distance_method":"parallax","ra_deg":270.628485,"dec_deg":26.313001,"epoch_ra_deg":270.901922,"epoch_dec_deg":26.30825,"epoch_moved_arcsec":19.143,"pm_ra_mas_yr":389.78,"pm_dec_mas_yr":-602.45,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-164922","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18025+2619","companions":[{"measured":2002,"magnitude":15,"components":"AE","discoverer_code":"HO  564","separation_arcsec":57.7,"position_angle_deg":339},{"measured":2002,"magnitude":12.5,"components":"AC","discoverer_code":"HO  564","separation_arcsec":92.9,"position_angle_deg":21},{"measured":2002,"magnitude":14.4,"components":"AB","discoverer_code":"HO  564","separation_arcsec":98.5,"position_angle_deg":326},{"measured":2017,"magnitude":10.8,"components":"AD","discoverer_code":"HO  564","separation_arcsec":110.6,"position_angle_deg":56},{"measured":2002,"magnitude":12.5,"components":"AF","discoverer_code":"HO  564","separation_arcsec":112.4,"position_angle_deg":63}],"spectral_type":"G9V","color_index_bv":0.799,"luminosity_solar":0.6692679069358427,"radial_velocity_km_s":20.7,"spectral_type_source":"SIMBAD (2003AJ....126.2048G, quality C)","proper_motion_ra_mas_yr":389.78,"proper_motion_dec_mas_yr":-602.45},"designations":[{"catalog":"Gliese","designation":"Gl 700.2"},{"catalog":"HD","designation":"HD 164922"},{"catalog":"HIP","designation":"HIP 88348"}],"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."}