Alcor
HR 5062 · HIP 65477 · 80 UMa
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 4.01 mag
- Parallax
- 39.91 mas → about 81.7 light-years away
- Spectral type
- A5V SB
- Right ascension
- 201.3064°
- Declination
- 54.988°
- Designation
- HR 5062
- Bayer designation
- 80 UMa
- HIP number
- 65477
- IAU name adopted
- 2016-06-30
- Name language
- Arabic
- Name origin (IAU)
- Ultimately from the pre-Islamic Arabian name al-jaun, for ε UMa, which was transliterated and eventually corrupted in Latin to "Alcor." The name was wrongly transferred to 80 UMa in Early Modern 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 82 years to reach Earth — the light you see tonight left around AD 1944 (official distance ÷ speed of light).
- At magnitude 4 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 55° — from Seoul (37.6° N) it never sets and circles the northern sky all night.
Worked out from this object's official values.