| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| 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 | |
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.
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.
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.
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