It was discovered in 1781 by Pierre Méchain. M101, also called the Pinwheel Galaxy, is a face-on spiral galaxy located 25 million light-years from Earth.
It was discovered by Pierre Méchain in 1781.
47 Ursae Majoris d, discovered in 2010, has an uncertain period, lying between 8907 and 19097 days; it is 1.64 times the mass of Jupiter.
The three-letter constellation abbreviation "UMa" was adopted by the IAU in 1922. ==Features== ===Asterisms=== 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 or (historically) Charles' Wain.
In 1930, Eugène Delporte set its official International Astronomical Union (IAU) constellation boundaries, defining it as a 28-sided irregular polygon.
47 Ursae Majoris b, discovered in 1996, orbits every 1078 days and is 2.53 times the mass of Jupiter.
47 Ursae Majoris c, discovered in 2001, orbits every 2391 days and is 0.54 times the mass of Jupiter.
Research conducted in 2003 indicates that its sole planet, HD 80606 b is a future [Jupiter], modeled to have evolved in a perpendicular orbit around 5 AU from its sun.
47 Ursae Majoris d, discovered in 2010, has an uncertain period, lying between 8907 and 19097 days; it is 1.64 times the mass of Jupiter.
SN 2014J, an apparent Type Ia supernova, was observed in M82 on 21 January 2014. M97, also called the Owl Nebula, is a planetary nebula 1,630 light-years from Earth; it has a magnitude of approximately 10.
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