165438+1October 4th constellation

I am165438+1what is the constellation on October 4th?

Scorpio.

Scorpio 65438+1October 24th-165438+1October 22nd. Scorpio, one of the zodiac signs, the earth moves to Scorpio at10.24-11.22 every year. Located in the southern hemisphere, between Libra in the west and Sagittarius in the east, it is a big constellation near the center of the Milky Way. Latitude changes from +40 degrees to? It is completely visible between 90 degrees.

Scorpio location: right ascension 16: 40, declination -36 degrees. Summer appears in the southern sky, and the scorpion's tail points to the southeast, between the snake head, Sagittarius and Libra. Alpha star (Antares) is a red star with a magnitude of 1. The open clusters M6 and M7 are visible to the naked eye, and 22 stars in the constellation are brighter than 4 stars.

Extended data:

Scorpio is the most conspicuous constellation in summer. There are many bright stars in it, and there are more than 20 brighter than 4m. Scorpio is big and has many bright stars, which can be said to be the representative of the summer night constellation. In addition, it is also a zodiac, so it is particularly eye-catching. However, Scorpio only occupies a short range of 7 on the ecliptic, which is the shortest ecliptic among the twelve constellations.

Scorpio is immersed in the vast galaxy from alpha star to long scorpion tail. Alpha is located in the scorpion's chest, so the west calls it "the heart of Scorpio". Interestingly, in ancient China, the alpha star of Scorpio was placed in the center of 28 nights, which was called "Antares". Astronomers from the East and the West happen to coincide here.

Because this constellation is located near the center of the Milky Way, it contains a large number of deep space objects, such as open cluster M6 (butterfly cluster), M7 (Ptolemy cluster), globular cluster M4 and M80, and the famous open cluster NGC 623 1.

M7

One of the most famous open star clusters in the sky. This cluster has many bright blue stars. At night, we can see it from the tail of Scorpio with the naked eye. M7 is about 1000 light years away from us, and consists of about1000 stars, with an age of about 200 million years and a size of about 25 light years. As early as ancient times, people began to know about the M7 open cluster, and Ptolemy, an ancient Greek, observed it in A.D. 130.