Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 23 Ursae Majoris, or 23 UMa, is a triple star in the constellation Ursa Major. Its main components, 23 UMa A and 23 UMa B, are approximately 75.5 light years from Earth. The primary component, 23 Ursae Majoris A, is a yellow-white F-type subgiant with an apparent magnitude of +3.65. At a separation of 22.7 arcseconds is the 9th magnitude 23 Ursae Majoris B. A and B form a physical binary. The third, optical, component, 23 Ursae Majoris C, is a magnitude +10.5 star 99.6 arcseconds away.