| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Hydra |
| Right ascension | 8h 46m 46.6s |
| Declination | 6° 25' 8" |
| Apparent magnitude (V) | 3.38 |
| Distance | 135 ly (41.41 pc) |
| Spectral type | G5III |
| Other designations | |
Epsilon Hydrae (ε Hya, ε Hydrae) is a Class G5, third-magnitude star in the constellation Hydra. Epsilon Hydrae is a binary star with components of magnitudes 3.3 and 6.8, separated by 2.7 arcseconds. This stellar system is located about 135 light-years from Earth.
This star, along with δ Hya (Lisan al Sudja), ζ Hya, η Hya, ρ Hya and σ Hya (Minhar al Shija), were Ulug Beg's Min al Azʽal, "Belonging to the Uninhabited Spot".[1]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Min al Azʽal or Minazal were the title for five stars:δ Hya as Minazal I, η Hya as Minazal II, ε Hya as Minazal III, ρ Hya as Minazal IV and ζ Hya as Minazal V (exclude σ Hya)[2]
In Chinese, 柳宿 (Liǔ Sù), meaning Willow (asterism), refers to an asterism consisting of ε Hydrae, δ Hydra, σ Hydrae, η Hydrae, ρ Hydrae, ζ Hydrae, ω Hydrae and θ Hydrae[3] Consequently, ε Hydrae itself is known as 柳宿五 (Liǔ Sù wǔ, English: the Fifth Star of Willow.)[4]
The people of Groote Eylandt called Unwala, "The Crab", for the star cluster including this star, δ Hya (Lisan al Sudja), ζ Hya, η Hya, ρ Hya and σ Hya (Minhar al Shija).[5]
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