The Bayer designation Omicron Canis Majoris (ο CMa / ο Canis Majoris) is shared by two stars, in the constellation Canis Major: ο1 Canis Majoris ο2 Canis Majoris They are separated by 2.06° on the sky.
ο1 Canis Majoris was member of asterism 軍市 (Jūn Shì), Market for Soldiers, Well mansion. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日 ο2 Canis Majoris was not any member of asterism.
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