It was supposed that Sirius must be affected by a second star, and in 1862 a faint companion star was finally detected by Alvan Clark, and it was named Sirius B.

• 据猜测天狼星一定受到第二颗星作用影响，而在1862年AlvanClark发现一颗暗淡的伴星，就把它取名为天狼星B。