{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T18:49:50.981Z","years_from_j2000":26.676,"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-187013","name":"17 Cyg","class":"f5_5iv_v_yellow_white_subgiant","category":"star","object_type":"F5.5IV-V yellow-white subgiant","mag":5,"mag_band":"V","abs_mag":3.365,"abs_mag_band":"V","distance_ly":69.24756517855266,"distance_method":"parallax","ra_deg":296.606655,"dec_deg":33.727598,"epoch_ra_deg":296.861037,"epoch_dec_deg":33.78949,"epoch_moved_arcsec":11.984,"pm_ra_mas_yr":23.05,"pm_dec_mas_yr":-448.66,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-187013","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19464+3344","age_years":3236407300,"companions":[{"measured":2024,"magnitude":9.25,"components":"AB","discoverer_code":"STF2580","separation_arcsec":26.3,"position_angle_deg":68},{"measured":1998,"magnitude":13.3,"components":"AD","discoverer_code":"KPR   4","separation_arcsec":89.5,"position_angle_deg":47},{"measured":2024,"magnitude":9.44,"components":"AC","discoverer_code":"STF2580","separation_arcsec":105.7,"position_angle_deg":122},{"measured":2012,"magnitude":11.98,"components":"AE","discoverer_code":"KPR   4","separation_arcsec":105.7,"position_angle_deg":63},{"measured":2024,"magnitude":8.48,"components":"AF","discoverer_code":"WNO  56","separation_arcsec":792.7,"position_angle_deg":235}],"mass_solar":1.289,"radius_solar":1.626,"spectral_type":"F5.5IV-V","uncertainties":{"metallicity_fe_h":[0.128,0.128]},"color_index_bv":0.476,"luminosity_solar":3.9264493539959964,"metallicity_fe_h":-0.07,"radial_velocity_km_s":4.2,"spectral_type_source":"SIMBAD (2003AJ....126.2048G, quality C)","surface_gravity_log_g":3.987,"surface_temperature_k":6271,"metallicity_fe_h_source":"Median of 8 spectroscopic determinations in 9 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":23.05,"proper_motion_dec_mas_yr":-448.66,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.7371},"designations":[{"catalog":"Bayer/Flamsteed","designation":"17 Cyg"},{"catalog":"Gliese","designation":"Gl 767.1A"},{"catalog":"HD","designation":"HD 187013"},{"catalog":"HIP","designation":"HIP 97295"},{"catalog":"HR","designation":"HR 7534"}],"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."}