| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Hydra |
| Right ascension | 8h 55m 23.6s |
| Declination | 5° 56' 44" |
| Apparent magnitude (V) | 3.11 |
| Distance | 151 ly (46.32 pc) |
| Spectral type | G9III |
| Other designations | |
Zeta Hydrae (ζ Hya, ζ Hydrae) is a Class G9, third-magnitude star in the constellation Hydra. Zeta Hydrae is a yellow giant star located about 150 light-years from Earth.
This star, along with δ Hya (Lisan al Sudja), ε 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, refers to an asterism consisting of ζ Hydrae, δ Hydra, σ Hydrae, η Hydrae, ρ Hydrae, ε Hydrae, ω Hydrae and θ Hydrae[3] Consequently, ζ Hydrae itself is known as 柳宿六 (Liǔ Sù liù, English: the Sixth 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), ε Hya, η Hya, ρ Hya and σ Hya (Minhar al Shija).[5]
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