Omicron1 Eridani (also known as Beid) is a star of visual magnitude 4.04. It lies approximately 125 light-years from Earth in the Eridanus constellation and is a class F (F2) giant with a surface temperature of 7100 K and a luminosity 28 times that of the Sun. In 1971 it was discovered to be a Delta Scuti variable star, with a variation of just a few hundredths of a magnitude with periods of 1.8 and 3.5 days.
Its Flamsteed designation is 38 Eridani.
In Chinese, 九州殊口 (Jiǔ Zhōu Shū Kǒu), meaning Interpreters of Nine Dialects, refers to an asterism consisting of ο1 Eridani, 39 Eridani, ξ Eridani, ν Eridani, 56 Eridani and 55 Eri. Consequently, ο1 Eridani itself is known as 九州殊口二 (Jiǔ Zhōu Shū Kǒu èr, English: the Second Star of Interpreters of Nine Dialects.)
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