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Omicron1 Canis Majoris
:''For other star systems with this Bayer designation, see Omicron Canis Majoris.''
Omicron1 Canis Majoris (ο1 CMa, ο1 Canis Majoris) is a star in the constellation Canis Major. Johann Bayer gave two adjacent stars the Bayer designation of Omicron Canis Majoris in 1603, but without distinguishing between the stars. John Flamsteed labelled the stars as Omicron1 and Omicron2 Canis Majoris in the early 18th century, as well as giving them his own numbered designations of 16 and 24 Canis Majoris respectively. Nicolas Louis de Lacaille labelled it c Canis Majoris, but this was not upheld by subsequent cartographers. Its Henry Draper Catalogue designation is HD 50877. The two Omicron stars marked the centre of the Great Dog's body on Bayer's 1603 ''Uranometria''.〔Wagman, p. 504.〕
The star itself is an orange K-type supergiant of spectral type K2.5Iab that is an irregular variable star, varying between apparent magnitudes 3.78 and 3.99. A cool star, its surface temperature is around 3,900 K.〔 Around 18 times as massive as the Sun with around 530 times its diameter, it shines with 65,000 times its luminosity.〔 Interstellar dust obscures it somewhat, and its apparent magnitude is 1.12 fainter than it would be if unobscured. Thought to be around 18 million years old, Omicron1 Canis Majoris is undergoing nuclear fusion of helium in its core to generate energy and will one day explode as a type II supernova.
Lying approximately 2000 light years from Earth,〔 Omicron1 Canis Majoris shares a common proper motion (and likely origin) with a remote open cluster of stars in the region known as Collinder 121, located around 3,500 light years (1085 parsecs) distant. Conversely, though only separated by 2 degrees from Omicron2 Canis Majoris, the two appear to be unrelated.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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