Zeta Hydrae


Zeta Hydrae is a solitary star in the equatorial constellation of Hydra. This is a generally faint constellation, so, at an apparent visual magnitude of +3.10, this is the third-brightest member after Alphard and Gamma Hydrae.

Distance

The distance to this star has been measured using the parallax technique, yielding a value of roughly. At this distance, the visual magnitude of the star is diminished by 0.03 as a result of extinction from intervening gas and dust. Delta Hydrae is about from Zeta Hydrae and may be a largely co-moving object. The star has one of the lower-error margin readings among those of the Gaia spacecraft which computes a parallax of 20.7182 ± 0.3925 mas and, if correct, a distance of 157 ± 3 light years.

Characteristics

With a stellar classification of G9 II-III, this is an evolved giant star that is radiating 132 times the luminosity of the Sun from its outer envelope at an effective temperature of 4,925 K. At this heat, the star glows with the yellow hue of a G-type star. The radius of this star, as measured using interferometry, is about 18 times the Sun's radius. It has an estimated 4.2 times the mass of the Sun and is around old.

Name and etymology

This star, along with δ Hya, ε Hya, η Hya, ρ Hya and σ Hya, were Ulug Beg's Min al Azʽal, "Belonging to the Uninhabited Spot". 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.
In Chinese, 柳宿, 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 Consequently, ζ Hydrae itself is known as 柳宿六.
The people of Groote Eylandt called Unwala, "The Crab", for the star cluster including this star, δ Hya, ε Hya, η Hya, ρ Hya and σ Hya.