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Ursa Major

constellation visible throughout the year in most of the northern hemisphere
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Ursa Major is a constellation that can be seen in the northern hemisphere and part of the southern hemisphere. Its name means Great Bear in Latin. It was named that because many different groups of people around the world have thought that its stars look a lot like a bear with a long tail. It is often used as a symbol for north.

Ursa Major
Constellation
Ursa Major
AbbreviationUMa
GenitiveUrsae Majoris
Pronunciation/ˈɜːrsə ˈmər/,
genitive /ˌɜːrs məˈɒr[invalid input: 'ɨ']s/
Symbolismthe Great Bear
Right ascension10.67
Declination+55.38
QuadrantNQ2
Area1280 sq. deg. (3rd)
Main stars7, 20
Bayer/Flamsteed
stars
93
Stars with planets20
Stars brighter than 3.00m7
Stars within 10.00 pc (32.62 ly)8
Brightest starε UMa (Alioth) (1.76m)
Messier objects7
Meteor showersAlpha Ursa Majorids
Leonids-Ursids
Bordering
constellations
Draco
Camelopardalis
Lynx
Leo Minor
Leo
Coma Berenices
Canes Venatici
Boötes
Visible at latitudes between +90° and −30°.
Best visible at 21:00 (9 p.m.) during the month of April.
Big dipper.triddle.jpg
The Big Dipper or Plough.

Deep-sky objectsEdit

Several bright galaxies are found in Ursa Major, including the pair Messier 81 (one of the brightest galaxies in the sky) and Messier 82 above the bear's head, and the Pinwheel galaxy (M101), a beautiful spiral galaxy northwest of the star η Ursae Majoris. Other well-known spiral galaxies are NGC 4102, NGC 4605, Messier 108 and Messier 109. The constellation has about 50 galaxies that can be seen with a small telescope. The Owl nebula, the brightest planetary nebula, can be found along the bottom of the bowl of the Big Dipper.

The Big DipperEdit

 
The Big Dipper (or Plough) within Ursa Major

The seven stars in the upper-left corner of Ursa Major form an asterism called the Big Dipper (or the Plough in Great Britain). This group has been recognized by almost all groups of people who live or lived in places where it can be seen in the sky and it is one of the best-known star patterns. The Big Dipper is helpful in finding the north star because an imaginary line drawn through the two stars on the right side will point directly at the north star. These two stars are called The Pointers and they are very important on navigation by stars.

All of the stars in the Big Dipper except Dubhe and Alkaid are moving toward the same point in the sky through proper motion. This group of stars is known as the Ursa Major Moving Group.

Other websitesEdit