Delta Ursae Minoris

δ Ursae Minoris

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Ursa Minor
Right ascension	17h 32m 12.9s
Declination	+86° 35' 11"
Apparent magnitude (V)	+4.35
Distance	183 ± 5 ly (56 ± 2 pc)
Spectral type	A1Vn
Other designations
Yildun, Vildiur, Gildun, Pherkard, Jildun, 23 Ursae Minoris, HR 6789, HD 166205, BD+86 269, FK5 913, HIP 85822, SAO 2937, GC 24236

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^{[citation needed]} have been called Pherkard, an alternate spelling of Pherkad, used for γ UMi and 11 UMi.

Delta Ursae Minoris is a white A-type main sequence dwarf with an apparent magnitude of +4.35. It is approximately 183 light years from Earth.

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) purple asteroid belt.