What season is Sagittarius in?

Sagittarius (Sagittarius, commonly known as Sagittarius, astronomical symbol:? 7? 2) It is a constellation of the zodiac in the southern sky, representing Kay Long Xing. It is aiming at Scorpio in its west with a bow, and it is adjacent to Capricorn in its east. Its bright stars are arranged in a unique teapot shape, which is not difficult to identify.

Myth and history

In Greek mythology, Sagittarius refers to Kay Long Xing Centauri. He is not as cruel and savage as other centaurs. Kay Long Xing is famous for her kindness and intelligence. He was the mentor of many Greek heroes, including Asclepius, theseus, Achilles, Jason and Heracles. Sagittarius's arrow points to Scorpio's chest in front.

Sagittarius shows Jason the way to golden fleece in the sky.

Sagittarius is equivalent to skip (γ, δ, ε, η) and Beidou (μ, λ, φ, σ, τ, ζ) in China's ancient astrological system.

trait

Sagittarius is not difficult to identify, because its main stars are arranged like a teapot: Jisu II (δ), Jisu III (ε), Dousu VI (ζ) and Dousu III (φ) form the pot body; Bean element II (λ) is a pot cover; Jisuyi (γ) is the spout; Dousu IV (σ) and Dousu V (τ) are pot handles.

Although Tianyuan San is the alpha star of Sagittarius, its apparent magnitude is only 4.0, which is even darker than many stars in the constellation.

Sagittarius lies in front of the brightest region of the Milky Way. This is a very spectacular constellation observed with binoculars on earth. With a small telescope, you can see thousands of stars.

The galactic center where the earth is located is in this constellation, but it is blocked by the nebula and dust belt on Sagittarius.

The celestial bodies in this constellation are mainly cosmic objects in the depths of the Milky Way, including emission nebulae and dark nebulae, open clusters and globular clusters, and planetary nebulae. There are as many as 15 messier objects in Sagittarius-the most in all constellations.

Many of them can be observed with binoculars.

Deep sky object

The center of our Milky Way is located in Sagittarius, so the Milky Way in Sagittarius is very dense, and there are many bright clusters and nebulae in the middle, such as M55, which is about 7.5 meters west of Giuseppe II.

If we use a telescope, we can see a more beautiful nebula: the lagoon nebula (M8) near Dousu II; Omega nebula (M 17, or swan nebula and horseshoe nebula) located near the boundary of the earth shield; There is also the Trigeminal Nebula (M20) which contains many young stars.

Sagittarius A, which is related to the center of the Milky Way, is a complex wireless power source, and astronomers think it may contain a supermassive black hole.

M8: This bright emission nebula is called the lagoon nebula-because a dark band of shielding material passes through this bright gas cloud. It is easy to see with binoculars.

This nebula contains a sparse open cluster NGC 6530.

M 17:M 17 is one of the brightest emission nebulae in the sky. It is also called Swan Nebula or Omega Nebula. This is because its brightest part is reminiscent of the body of a swan swimming on the lake.

Using an 8-inch (20 cm) or larger telescope with a nebula filter can remove the dark nebula-like material that almost fills the area. It is easy to see with binoculars.

M 18: This small loose cluster has more than a dozen celestial bodies with magnitude from +9 to+10.

M20: Also called trifid nebula, it is a divergent emission hybrid nebula. Its color photos are very beautiful, and you can see its pink and bright blue parts. Through a small telescope,

What is even more elusive is that the dark trench formed by masking material divides this nebula into three regions, so it is called the trifid nebula. In the center of the nebula, there is a dazzling triad star. M20 is 5000 light years away from the Earth.

In which hot young stars are surrounded by dust and gas.

M2 1: This is a bright but rather small loose cluster, which can be easily seen with a small telescope. Its total magnitude is +5.9.

M22: This is one of the best globular clusters in the sky, second only to the omega cluster and azaleas in southern Centauri. 47. It is a globular cluster with a loose structure and a diameter of about 18 arc minutes.

It can be observed well with an 8-inch (20 cm) telescope, and even many individual stars in its central part can be distinguished. M22 is a cluster near the Earth with a total magnitude of +5. 1.

M23: This is a huge and spectacular open cluster with about 65,438+000 stars +9 or darker. Its magnitude is +5.5.

M24: Also called Sagittarius Nebula. Its diameter exceeds 1 degree. It is not a real cluster, but a bright part of the Milky Way. You can see it with the naked eye, but you can see it more clearly with binoculars.

You can see countless stars with a small telescope.

M25: This is a bright, sparse and loose cluster, with about 50 stars of +6 magnitude, and many are even darker.

M28: This is a globular cluster with medium brightness, but it is very dense. It takes a telescope about 12 inch (30 cm) in diameter to distinguish a star. Its magnitude is +6.9.

M54: This is a small and dense globular cluster with medium brightness. It takes a large telescope to tell. Its magnitude is +7.7 and it is 68,000 light years away from the Earth.

M55: This is a bright and loose globular cluster, which can be easily distinguished with an 8-inch (20 cm) telescope. Its magnitude is +7.0, and it is 20,000 light years away from the Earth.

M69: This is a small round globular cluster. The density is quite high. With the high magnification of an 8-inch (20 cm) telescope, some stars on the edge can be distinguished, and their magnitude is +7.7.

astrology

In astrology, Sagittarius (165438+1October 22nd-65438+February 2nd1) is mapped to Sagittarius.

Sagittarius Palace, Aries Palace and Lion Palace are all related to fire in the four elements, so they are called Fire Palace. Its opposite constellation is twin uterus.