Yildun
HR 6789 · HIP 85822 · δ UMi
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 4.336 mag
- Parallax
- 18.95 mas → about 172.1 light-years away
- Spectral type
- A1Vn
- Right ascension
- 263.0542°
- Declination
- 86.5865°
- Designation
- HR 6789
- Bayer designation
- δ UMi
- HIP number
- 85822
- IAU name adopted
- 2016-08-21
- Name language
- Arabic
- Name origin (IAU)
- From the Turkish word yildiz, "star." In Early Modern times this common noun was erroneously said to be a Turkish name for the Pole Star (α UMi). Misspelled as "Yildun," the word was arbitrarily applied as a star name to δ UMi in recent times.
Source:IAU Working Group on Star Names · checked 2026-11-02 ↗ESA Hipparcos Catalogue (ESA Gaia Archive) · checked 2026-11-03 ↗
Related
Constellation
In everyday life
- Light from this object takes about 172 years to reach Earth — the light you see tonight left around AD 1854 (official distance ÷ speed of light).
- At magnitude 4.3 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 86.6° — from Seoul (37.6° N) it never sets and circles the northern sky all night.
Worked out from this object's official values.