Magnitude 3.71 | Constellation Serpens | |
People also search for Beta Serpentis, Kappa Serpentis | ||
Epsilon Serpentis (ε Ser, ε Serpentis) is a star in the constellation Serpens, in its head (Serpens Caput).
Contents
Etymology
It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser (Unukalhai), δ Ser (Qin, Tsin), δ Oph (Yed Prior), ε Oph (Yed Posterior), ζ Oph (Han) and γ Oph (Tsung Ching).
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Yamānī or Nasak Yamani were the title for two stars :δ Ser as Nasak Yamani I and ε Ser as Nasak Yamani II (exclude α Ser, δ Oph, ε Oph, ζ Oph and γ Oph)
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of ε Serpentis, β Herculis, γ Herculis, κ Herculis, γ Serpentis, β Serpentis, α Serpentis, δ Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi. Consequently, ε Serpentis itself is known as 天市右垣八 (Tiān Shì Yòu Yuán bā, English: the Eighth Star of Right Wall of Heavenly Market Enclosure), represent the state Ba (巴) (or Pa).
Properties
Epsilon Serpentis is a white A-type main sequence dwarf with an apparent magnitude of +3.71. It is approximately 70.3 light years from Earth. This star has 1.8 times the Sun's radius and it is radiating 12 times the luminosity of the Sun from its outer envelope at an effective temperature of 8,084 K.