Baten Kaitos
HR 539 · HIP 8645 · ζ Cet
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 3.72 mag
- Parallax
- 13.88 mas → about 235 light-years away
- Spectral type
- K2III
- Right ascension
- 27.8651°
- Declination
- -10.335°
- Designation
- HR 539
- Bayer designation
- ζ Cet
- HIP number
- 8645
- IAU name adopted
- 2016-09-12
- Name language
- Arabic
- Name origin (IAU)
- Applied in recent times from its name for the Arabic Almagest period batn qaitus, "the Sea Monster's Belly."
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 235 years to reach Earth — the light you see tonight left around AD 1791 (official distance ÷ speed of light).
- At magnitude 3.7 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination -10.3° — 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.