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40 Eridani

From Simple English Wikipedia, the free encyclopedia

40 Eridani, in short terms, 40 Eri and named as Keid,[1] is a triple star system in the constellation of Eridanus, it is about 16.3 light-years from the Sun.

The 40 Eridani star system

The main star of the system, 40 Erdiani A (Keid A) is easily visible to the naked eye. It is orbited by a binary star, two stars orbiting each other and both of them orbiting the main star. The star system was discovered on January 31, 1783, by astronomer William Herschel.[2]

References[change | change source]

  1. "Naming Stars". IAU.org. Retrieved 16 December 2017.
  2. Herschel, William (1785). "Catalogue of Double Stars. By William Herschel, Esq. F. R. S". Philosophical Transactions of the Royal Society of London. 75: 40–126. Bibcode:1785RSPT...75...40H. doi:10.1098/rstl.1785.0006. JSTOR 106749. S2CID 186209747.