Delta Ursae Minoris
Epoch J2000 Equinox J2000
|Right ascension||17h 32m 12.9s|
|Declination||86° 35′ 11.25″|
|Apparent magnitude (V)||4.35|
|Radial velocity (Rv)||−7.6 km/s|
|Parallax (π)||18.95 ± 0.14 mas|
|Distance||172 ± 1 ly
(52.8 ± 0.4 pc)
|Absolute magnitude (MV)||0.62|
Delta Ursae Minoris (δ UMi, δ Ursae Minoris; also 23 UMi) is a star in the constellation Ursa Minor. It has the traditional name Yildun (also spelled Vildiur, Jildun, Gildun, and Yilduz), from the Turkish yıldız "star". It may also have been called Pherkard, an alternate spelling of Pherkad, used for γ UMi and 11 UMi.
 In science fiction
The star is mentioned in the Honorverse, a series of military science fiction novels written by David Weber, as the headquarters of Technodyne Industries of Yildun, a major Solarian League shipbuilding corporation with rather questionable ethics (e.g. business ties with Manpower Incorporated and Jessyk Combine, both of Mesa), though the star system is described as including only a (highly mineral-and-metals-rich) asteroid belt.
- Delta Ursae Minoris on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- YILDUN (Delta Ursae Minoris) – Jim Kaler
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