{"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":"2026-09-07T10:02:37.334Z","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-195593","name":"44 Cyg","class":"f5ib_yellow_white_supergiant","category":"star","object_type":"F5Ib yellow-white supergiant","mag":6.21,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":307.74679499999996,"dec_deg":36.935839,"epoch_ra_deg":308.00107,"epoch_dec_deg":37.025822,"epoch_moved_arcsec":0.112,"pm_ra_mas_yr":-0.2,"pm_dec_mas_yr":-4.18,"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-195593","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20310+3656","companions":[{"measured":2015,"magnitude":null,"components":"Aa,Ab","discoverer_code":"AC   18","separation_arcsec":0.2,"position_angle_deg":72},{"measured":2015,"magnitude":10.12,"components":"AB","discoverer_code":"AC   18","separation_arcsec":2.2,"position_angle_deg":158},{"measured":2015,"magnitude":12.8,"components":"AC","discoverer_code":"KUI  98","separation_arcsec":16.8,"position_angle_deg":76},{"measured":2015,"magnitude":12.3,"components":"AD","discoverer_code":"AC   18","separation_arcsec":63.1,"position_angle_deg":165}],"spectral_type":"F5Ib","uncertainties":{"metallicity_fe_h":[0.042,0.042]},"color_index_bv":0.969,"metallicity_fe_h":-0.04,"radial_velocity_km_s":-22,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":1.64,"surface_temperature_k":6546,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-0.2,"proper_motion_dec_mas_yr":-4.18,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"44 Cyg"},{"catalog":"HD","designation":"HD 195593"},{"catalog":"HIP","designation":"HIP 101214"},{"catalog":"HR","designation":"HR 7847"}],"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."}