| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Hydra |
| Right ascension | 8h 37m 39.4s |
| Declination | 5° 42' 13" |
| Apparent magnitude (V) | 4.14 |
| Distance | 179 ly (54.91 pc) |
| Spectral type | A1V |
| Other designations | |
Delta Hydrae (δ Hya, δ Hydrae) is a Class A1, fourth-magnitude star in the constellation Hydra. Delta Hydrae is a binary double star, located about 180 light-years from Earth.
In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Lisan al Shudja, which was translated into Latin as Lingua Hydri, meaning the snake's tongue.[1]
This star, along with ε Hya, ζ Hya, η Hya, ρ Hya and σ Hya (Minhar al Shija), were Ulugh Beg's Min al Azʽal, "Belonging to the Uninhabited Spot".[2]
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)[3]
In Chinese, 柳宿 (Liǔ Sù), meaning Willow (asterism), refers to an asterism consisting of δ Hydrae, σ Hydrae, η Hydrae, ρ Hydrae, ε Hydrae, ζ Hydrae, ω Hydrae and θ Hydrae[4] Consequently, δ Hydrae itself is known as 柳宿一 (Liǔ Sù yī, English: the First Star of Willow.)[5]
The people of Groote Eylandt called Unwala, "The Crab", for the star cluster including this star, ε Hya, ζ Hya, η Hya, ρ Hya and σ Hya (Minhar al Shija).[6]
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