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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 ...
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.
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.
Nu Ursae Majoris (ν Ursae Majoris, abbreviated Nu UMa, ν UMa), formally named Alula Borealis / ə ˈ l uː l ə b ɒ r i ˈ æ l ɪ s /, [10] [11] is a double star in the northern circumpolar constellation of Ursa Major. At an apparent visual magnitude of +3.490, [2] it is bright enough to be seen with the naked eye.
Phecda / ˈ f ɛ k d ə /, also called Gamma Ursae Majoris (γ Ursae Majoris, abbreviated Gamma UMa, γ UMa), [10] [11] is a star in the constellation of Ursa Major.Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. [12]
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 ...
Book plate by Sidney Hall depicting Ursa Major's stars A light curve for Epsilon Ursae Majoris, plotted from TESS data [11] According to Hipparcos, Epsilon Ursae Majoris is 81 light-years (25 parsecs) from the Sun. Its spectral type is A1p; the "p" stands for peculiar, as its spectrum is characteristic of an α 2 Canum Venaticorum variable.
NCG 5204 is a Magellanic spiral galaxy located about 14.5 million light-years away from Earth [note 1] in the constellation of Ursa Major and is a member of the M101 Group of galaxies. [4] [5] It has a galaxy morphological classification of SA(s)m and is highly irregular, with only the barest indication of any spiral arm structure. [3]