40 Eridani
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 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]
- ↑ "Naming Stars". IAU.org. Retrieved 16 December 2017.
- ↑ 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.