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Ursae Minoris: Difference between revisions
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==Real Life Information== | ==Real Life Information== | ||
Ursae Minoris, also known as Ursa Minor or the Little Bear, is not a star but a constellation in the northern sky. However, it does contain several notable stars, including Polaris (the North Star), which is the brightest star in the constellation. | |||
The constellation Ursa Minor was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, because of Polaris being the North Star. | |||
Polaris, also known as Alpha Ursae Minoris, is a multiple star, comprising the main star in orbit with a smaller companion; the pair in orbit with Polaris B (discovered in 1780 by William Herschel). The system is located about 323 light-years from Earth and is the closest Cepheid variable star to Earth. It is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, making it a useful tool for astronomers. | |||
Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the "guardians of the pole star", standing by while precession slowly shifts Polaris away from the pole. | |||
Gamma Ursae Minoris, also known as Pherkad, is a white supergiant star of an apparent magnitude 3.0. A Cepheid variable, it ranges in brightness from a magnitude of 2.7 to 3.6 over a period of 4 days. It forms the "guardians of the pole star" with Kochab. | |||
The constellation also contains four stars with known planets, and does not host any Messier objects. Ursa Minor is bordered by Camelopardalis to the west, Draco to the west, and Cepheus to the east. The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is 'UMi'. | |||
The constellation Ursa Minor as a whole is significant in world mythology. Its pattern is said to represent a small bear with a long tail, and it has been associated with various animals and mythological figures across different cultures. In Greek mythology, it is associated with Callisto, a nymph who was turned into a bear by Hera, and subsequently into a constellation by Zeus. | |||
==Images== | ==Images== | ||