{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T07:45:15.117Z","years_from_j2000":26.683,"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-162917","name":"HD 162917","class":"f4iv_v_yellow_white_subgiant","category":"star","object_type":"F4IV-V yellow-white subgiant","mag":5.77,"mag_band":"V","abs_mag":3.305,"abs_mag_band":"V","distance_ly":101.51160637504836,"distance_method":"parallax","ra_deg":268.30911000000003,"dec_deg":6.101424,"epoch_ra_deg":268.636435,"epoch_dec_deg":6.095656,"epoch_moved_arcsec":3.887,"pm_ra_mas_yr":-127.82,"pm_dec_mas_yr":69.89,"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-162917","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17532+0606","companions":[{"measured":2012,"magnitude":16.8,"components":"AB","discoverer_code":"JNN 244","separation_arcsec":3,"position_angle_deg":124},{"measured":2012,"magnitude":17.3,"components":"AC","discoverer_code":"JNN 244","separation_arcsec":3.4,"position_angle_deg":307},{"measured":2012,"magnitude":17.6,"components":"AD","discoverer_code":"JNN 244","separation_arcsec":4.4,"position_angle_deg":175}],"spectral_type":"F4IV-V","color_index_bv":0.425,"luminosity_solar":4.149540426343628,"metallicity_fe_h":0.1,"radial_velocity_km_s":-33,"spectral_type_source":"SIMBAD (1986ApJ...303..724B, quality D)","surface_gravity_log_g":4.1,"surface_temperature_k":6504,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-127.82,"proper_motion_dec_mas_yr":69.89,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 162917"},{"catalog":"HIP","designation":"HIP 87558"},{"catalog":"HR","designation":"HR 6670"}],"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."}