{"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":"2026-09-04T15:32:32.519Z","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-17505","name":"HD 17505","class":"o6_5iii_f_n_o8v_blue_giant","category":"star","object_type":"O6.5III((f))n+O8V blue giant","mag":7.14,"mag_band":"V","abs_mag":-2.575,"abs_mag_band":"V","distance_ly":2861.020914384833,"distance_method":"parallax","ra_deg":42.783225,"dec_deg":60.417743,"epoch_ra_deg":43.304537,"epoch_dec_deg":60.52857,"epoch_moved_arcsec":0.041,"pm_ra_mas_yr":-1.38,"pm_dec_mas_yr":-0.69,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cassiopeia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-17505","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02511+6025","companions":[{"measured":2018,"magnitude":9.09,"components":"AB","discoverer_code":"STF 306","separation_arcsec":2.2,"position_angle_deg":93},{"measured":2015,"magnitude":14,"components":"AI","discoverer_code":"TRN  13","separation_arcsec":4.7,"position_angle_deg":144},{"measured":2015,"magnitude":13.9,"components":"AJ","discoverer_code":"MZA  11","separation_arcsec":8.9,"position_angle_deg":96},{"measured":2015,"magnitude":14.4,"components":"AM","discoverer_code":"SS    4","separation_arcsec":13.1,"position_angle_deg":295},{"measured":2015,"magnitude":15.3,"components":"AL","discoverer_code":"MZA  11","separation_arcsec":13.5,"position_angle_deg":224},{"measured":2015,"magnitude":14.4,"components":"AK","discoverer_code":"MZA  11","separation_arcsec":13.7,"position_angle_deg":314},{"measured":2015,"magnitude":14.6,"components":"AN","discoverer_code":"SS    4","separation_arcsec":15.1,"position_angle_deg":261},{"measured":2015,"magnitude":12,"components":"AD","discoverer_code":"STF 306","separation_arcsec":16.7,"position_angle_deg":76},{"measured":2015,"magnitude":14.4,"components":"AO","discoverer_code":"SS    4","separation_arcsec":17.8,"position_angle_deg":167},{"measured":2015,"magnitude":11.7,"components":"AE","discoverer_code":"STF 306","separation_arcsec":19,"position_angle_deg":113},{"measured":2015,"magnitude":15.6,"components":"AP","discoverer_code":"SS    4","separation_arcsec":19.3,"position_angle_deg":185},{"measured":2015,"magnitude":15.6,"components":"AQ","discoverer_code":"SS    4","separation_arcsec":24.4,"position_angle_deg":233},{"measured":2015,"magnitude":11.81,"components":"AF","discoverer_code":"STF 306","separation_arcsec":27,"position_angle_deg":107},{"measured":2015,"magnitude":11.5,"components":"AC","discoverer_code":"STF 306","separation_arcsec":27.4,"position_angle_deg":159},{"measured":2015,"magnitude":13.1,"components":"AR","discoverer_code":"SS    4","separation_arcsec":38.2,"position_angle_deg":6},{"measured":2015,"magnitude":13.4,"components":"AU","discoverer_code":"SS    4","separation_arcsec":41.4,"position_angle_deg":57},{"measured":2015,"magnitude":13.4,"components":"AT","discoverer_code":"SS    4","separation_arcsec":41.5,"position_angle_deg":107},{"measured":2015,"magnitude":14.2,"components":"AS","discoverer_code":"SS    4","separation_arcsec":42.1,"position_angle_deg":209},{"measured":2016,"magnitude":8.37,"components":"AG","discoverer_code":"STF 306","separation_arcsec":123.7,"position_angle_deg":157}],"radius_solar":32.245,"spectral_type":"O6.5III((f))n+O8V","color_index_bv":0.322,"luminosity_solar":933.2543007969915,"radial_velocity_km_s":-26,"spectral_type_source":"SIMBAD (2011ApJS..193...24S, quality C)","surface_gravity_log_g":2.643,"surface_temperature_k":17642,"proper_motion_ra_mas_yr":-1.38,"proper_motion_dec_mas_yr":-0.69,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate"},"designations":[{"catalog":"HD","designation":"HD 17505"},{"catalog":"HIP","designation":"HIP 13296"}],"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."}