{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T15:22:18.402Z","years_from_j2000":26.673,"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-164595","name":"HD 164595","class":"g2v_yellow_main_sequence_star","category":"star","object_type":"G2V yellow main-sequence star","mag":7.07,"mag_band":"V","abs_mag":4.806,"abs_mag_band":"V","distance_ly":92.50023181511246,"distance_method":"parallax","ra_deg":270.162105,"dec_deg":29.571922,"epoch_ra_deg":270.42014,"epoch_dec_deg":29.571669,"epoch_moved_arcsec":5.933,"pm_ra_mas_yr":-139.38,"pm_dec_mas_yr":173.34,"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-164595","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18006+2934","age_years":9254996000,"companions":[{"measured":2016,"magnitude":13.1,"components":null,"discoverer_code":"LDS6413","separation_arcsec":88.1,"position_angle_deg":105}],"mass_solar":0.942,"radius_solar":1.046,"spectral_type":"G2V","color_index_bv":0.635,"luminosity_solar":1.0413578615284342,"radial_velocity_km_s":7.2,"spectral_type_source":"SIMBAD (1970AJ.....75..507H, quality C)","surface_gravity_log_g":4.332,"surface_temperature_k":5667,"proper_motion_ra_mas_yr":-139.38,"proper_motion_dec_mas_yr":173.34,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.0138},"designations":[{"catalog":"HD","designation":"HD 164595"},{"catalog":"HIP","designation":"HIP 88194"}],"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."}