What is the name of the brightest star in Sagittarius?

Sagittarius, also known as Sagittarius, is the ninth sign of the zodiac, located between Scorpio and Capricorn. Other important constellations around it are Ophiuchus, Ophiuchus, 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, so Sagittarius in the sky is like a bow ready for archery.

The brightest star in Sagittarius is Sagittarius E-star "Jisu III", whose English scientific name is Kaus Australis (Arabic means "South Bow"), and its brightness is 1.9, which is blue and white and 88 light years away from the Earth. Sagittarius e, d and l form the bow held by Sagittarius. 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.