10 Ursae Majoris

The name of this F-type binary star is something of an historical accident. Centuries ago, it belonged to the constellation of the Great Bear, as the designation Ursae Majoris suggests. In 1690, though, it was transferred by Hevelius into Lynx, where it remains to this day. For some reason, though, its 'Great Bear' name has, almost uniquely, survived for more than three hundred years.

10 Ursae Majoris has about the same mass as Earth's Sun, but is considerably hotter. It has a rapidly orbiting companion.

The galactic position and direction of 10 Ursae Majoris relative to Earth's Sun. Note that, at this extreme scale, the two stars are effectively in the same place.