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Ursa Major and Polaris with names of bright stars in the Big Dipper The constellation Ursa Major as it can be seen by the unaided eye The outline of the seven bright stars of Ursa Major form the asterism known as the " Big Dipper " in the United States and Canada, while in the United Kingdom it is called the Plough [ 6 ] or (historically ...
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Twice in each sidereal day Polaris's azimuth is true north; the rest of the time it is displaced eastward or westward, and the bearing must be corrected using tables or a rule of thumb. The best approximation [33] is made using the leading edge of the "Big Dipper" asterism in the constellation Ursa Major.
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Upsilon Ursae Majoris, Latinized from υ Ursae Majoris, is a binary star [12] in the northern circumpolar constellation of Ursa Major. It is visible to the naked eye with an apparent visual magnitude of +3.79. [4] Based upon an annual parallax shift of 13.24 mas, [1] it is located roughly 246 light-years from the Sun.
Omicron Ursae Majoris (ο Ursae Majoris, abbreviated Omicron UMa, ο UMa), formally named Muscida / ˈ m juː s ɪ d ə /, [12] [13] is a star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.35 [2] and is located at a distance of around 179 light-years (55 parsecs) from the Sun. [1]
Psi Ursae Majoris (Psi UMa, ψ Ursae Majoris, ψ UMa) is a star in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.01, [2] making it a third magnitude star and one of the brighter members of the constellation. Parallax measurements place it at a distance of 140 light-years (43 parsecs) from Earth. [1]
Based on the numbers of its constituent stars, the Ursa Major Moving Group is believed to have once been an open cluster, having formed from a protostellar nebula approximately 500 million years ago. Since then, the sparse group has scattered over a region about 30 by 18 light-years, whose center is currently about 80 light-years away, making ...