Zuogeng
HR 646 · HIP 10306 · η Ari
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 5.2 mag
- Parallax
- 34.64 mas → about 94.2 light-years away
- Spectral type
- F5V
- Right ascension
- 33.2004°
- Declination
- 21.211°
- Designation
- HR 646
- Bayer designation
- η Ari
- HIP number
- 10306
- IAU name adopted
- 2026-10-15
- Name language
- Chinese
- Name origin (IAU)
- Zuǒ Gēng (左更, Official in Charge of the Forest) and Yòu Gēng (右更, Official in Charge of Pasturing) are two paired Chinese asterisms.
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 94 years to reach Earth — the light you see tonight left around AD 1932 (official distance ÷ speed of light).
- At magnitude 5.2 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 21.2° — it rises above the horizon in Seoul (37.6° N), so it is visible from Korea in the right season.
Worked out from this object's official values.