Where are Ursa Major and Ursa Minor? _ Where are Ursa Major and Ursa Minor?

Ursa minor is adjacent to Panthera and Draco in the west and Cepheus in the east. It covers an area of 256 square degrees, ranking 56th among 88 constellations. Ursa minor is commonly called Little Beidou, because the seven brightest stars in the constellation seem to form the shape of a bucket (or spoon).

The star at the end of bucket handle is Gou Jian, and now it is Polaris. Gou Chenyi can be found through the connection between Shu Tian (α Ursa major) and Tian Xuan (β Ursa major), which form the end of the Big Dipper. From the connection with the night sky outside the Big Dipper, point out 30 degrees (three times the width of the fist on the straight arm) and you can find Gou Chenyi.

The apparent magnitude of the four stars that make up Ursa minor is 2, 3, 4 and 5 respectively, so it can be used as a guide to the magnitude of visible stars, to judge the visible magnitude for urban residents or to measure a person's vision.

Ursa minor is one of the northern constellations. Like Ursa Major, Ursa Major's tail can also be regarded as the handle of a bucket (or spoon), so it is called "Little Beidou": four of the seven stars form a ladle on the bucket, just like the Big Dipper. Ptolemy, an astronomer in the 2nd century A.D., incorporated Ursa minor into its 48 constellations, and since then it has become one of the 88 modern constellations.

Traditionally, Ursa minor is an important navigation constellation, especially in navigation, because the first constellation in Ursa minor is Polaris.

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Detailed star

Dog Chen Yi (α Ursa minor) is the brightest star in this constellation. It is a yellow-white Supergiant star and the brightest Cepheid variable in the night sky. Its apparent magnitude ranges from 1.97 to 2.00. Polaris II (beta Ursa minor) is in the late stage of its life. It has expanded and cooled into an orange giant with an apparent magnitude of 2.08, only a little darker than Gou Chen.

Arctic II and Arctic I (Ursa minor γ) were once called "the guardian stars of Polaris". Four stars in Ursa minor have been detected to be surrounded by planets, including North Pole II. Ursa minor also contains an isolated neutron star, Kavira, and the hottest known white dwarf, H 1504+65, with a surface temperature of 200,000 Kelvin.

References:

Baidu encyclopedia-Ursa major