40 Eridani
40 Eridani or
Keid is a triple star system less than 16.5 light years away from
Earth. It is in constellation
Eridanus. It was discovered to be a double star in
1783 by
William Herschel, and in
1851 it was discovered that one of the stars in the double was itself a double, by Otto Wilhem von Struve.