Ain
HR 1409 · HIP 20889 · ε Tau
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 3.53 mag
- Parallax
- 22.24 mas → about 146.7 light-years away
- Spectral type
- K0III
- Surface temperature
- 4,877 K
- Right ascension
- 67.1542°
- Declination
- 19.1804°
- Designation
- HR 1409
- Bayer designation
- ε Tau
- HIP number
- 20889
- IAU name adopted
- 2015-12-15
- Name language
- Arabic
- Name origin (IAU)
- From an abbreviation of the name for the Arabic Almagest period ain al-thaur "the Bull's Eye," for a Tau. Applied to ε Tau in recent times (Ptolemy had α Tau the southern eye, and ε Tau on the northern eye).
Source:IAU Working Group on Star Names · checked 2026-11-02 ↗ESA Hipparcos Catalogue (ESA Gaia Archive) · checked 2026-11-03 ↗NASA Exoplanet Archive (Caltech/IPAC) · checked 2026-11-03 ↗
Related
Constellation
Planets
In everyday life
- Light from this object takes about 147 years to reach Earth — the light you see tonight left around AD 1879 (official distance ÷ speed of light).
- At magnitude 3.5 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 19.2° — 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.