What constellation does the Big Dipper belong to? How many stars does Sagittarius have?

According to the modern international star naming system, the Big Dipper belongs to Ursa major.

The Big Dipper consists of seven stars, namely Shu Tian, Tian Xuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang. Ancestors connected these seven stars and imagined them as barrels of wine in ancient times. Shu Tian, Tian Xuan, Tian Ji and Tian Quan form a bucket body, Gu Yuekui and Dou Kui; Yuheng, Kaiyang and Yaoguang are composed of the ancient structure of bucket handle. Tian Xuan and Shu Tian are in a straight line, extending about five times, and then you can find Polaris, which constitutes the Polaris area.

The sequence of the Big Dipper from Doukou to bucket handle is Shu Tian, Tian Xuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang. The top four are called "Dou Kui", and some are called "Xuan Ji"; The latter three are called "bucket handle", and some are called "Yuheng". Modern stars are named Ursa major, Ursa major, Ursa major, Ursa major, Ursa major, Ursa major, Ursa major, Ursa major and Ursa major. Connect the two stars at the mouth of the barrel and extend to the mouth of the barrel for five times, and you can find the North Star. These two stars are also called "finger stars".

Sagittarius English name: Sagittarius English abbreviation: Sgr celestial sphere position: right ascension 19.0 h declination -25 o brightest main star: Kaus Australis important celestial bodies: M8, M 17, M20, M22 best observation: China constellation: extreme speed, fighting speed, Tianyuan size ranking:/kloc. The more important constellations around it are Ophiuchus, Hydra, Eagle and Corona. Every year from 1 February 18 to1month 19, the sun passes through Sagittarius, so the winter solstice also falls in this constellation. In the constellation of China, Sagittarius has six stars, which are shaped like the Big Dipper, and are called "the six stars in the south bucket". Sagittarius is a monster in Greek mythology, whose upper body is a man and the lower body is a horse. It is the inventor of archery. Therefore, Sagittarius in the sky looks like it is ready to shoot an arrow. The brightest star in Sagittarius is Sagittarius E-star "Gisusan", which is called Kaus Australis in English (Arabic means "South Bow"), and its brightness is 1.9, which is blue and white. The second brightest star in Sagittarius is Sagittarius S star "Dousus" (English name Nunki), with brightness of 2.0, blue and white. This star is located in the palm of the right hand of the human bow, and it is also the brightest of the six stars in Nandou. Nunki was called "the star at the end of the ocean" in Babylonian times. The sea here refers to the sky east of Sagittarius, including Aquarius, Capricorn, Dolphin, Pisces, Pisces and Pisces. It is not difficult to see that these constellations are all related to water. Sagittarius B, Tianyuan No.1, is a cluster star with a naked eye brightness of 3.9, but its member stars are not related, and their distances from the earth are also different. But the naked eye looks like two distant binary stars with brightness of 4.0 and 4.3 respectively, namely Tianyuan No.1 B and Tianyuan No.2 b 1 ... Sagittarius is a very important constellation in astronomical observation, because the center of our Milky Way is just in the direction of Sagittarius, so when observing Sagittarius, we can see that the Milky Way is passing by on the west side of Sagittarius. If you look at the Milky Way with a telescope in this direction, you will find that the stars are particularly dense, and there are several bright stars in Sagittarius. This area is also a treasure house for observing nebula clusters, among which M8 "Lagoon Nebula", M 17 "Omega Nebula" and M20 "trifid nebula" are the most popular among photographers. The M8 lagoon nebula can be seen with the naked eye. To the west of Sagittarius L is a bright star cloud in the Milky Way, which also contains a cluster. The lagoon cluster is about three times as wide as the full moon and about 5200 light years away from the earth. In the cluster part, the brightest cluster is M22, which is located not far east of Sagittarius L, and it is the third brightest globular cluster in the sky. When the weather is good, it can also be seen with the naked eye, which is about two-thirds the size of the full moon. Open clusters include M23, M24, M25, etc. They are located in the northwest of Sagittarius and can be easily seen with binoculars. Star name, position, brightness distance (light-years) Remarks on Chromatogram English name Chinese name Right ascension and declination E kaus Australia Jisu III18H24m10s-3423' 05 "1.8585B9s Nunkijisu IV18s55m/ kloc-0/6s-26 17 ' 48 " 2.02 209 B3 as Cella、Dousu Noalis Dousu II 18h 27m 58s-2525 ' 18 " 2.8 1 .98 k2 palbaldah Jian San 1.9h 09m 46s-2 1.0 1 ' 25 " 2.893 10f 2g。 18H05M48s-3025' 26 "2.99117k0 In the constellation of China, Sagittarius has" constellation ","polar constellation "and" Tianyuan ". Dousu, also known as Nandou Six Stars, consists of shooters Z, T, S, F, L and M, and is named Dousu Six to Dousu One in turn. Jisu is located in the southwest of Dousu, and consists of four stars, namely G, D, E and H, Sagittarius, which are named Jisu I to Jisu IV respectively. In ancient China, Jisu was also called "Fengbo". It is said that whenever the moon enters Jisu, the wind will blow. Tianyuan consists of A, B, b 1 at the southern end of the shooter.