A well-known binary star, whose both white components have a brightness of about 5.65 mag, but appear as a single point of 5th magnitude to the naked eye. The mutual orbital period of both companions is over 812 years. By the end of the 20th century, the two stars were separated by about 1.9", requiring higher magnification to be resolved. Therefore, it is a suitable test for a good 100 mm telescope. The system is located 89 light-years away from Earth.