When can you see Andromeda and then which direction

Andromeda is a constellation of the stars in the autumn night, and on the northeast side of the Pegasus quadrilateral, there are three brighter (2nd magnitude) stars, the Naksha.

2. Kui Su Jiu and Tian Da General 1, of which Bi Su 2 is a vertex of the Pegasus quadrilateral. The blurred spot in the circle in the picture is the famous Andromeda Nebula, which is faintly visible to the naked eye on a clear night without light pollution.

A long, long time ago, human beings began to explore the universe, galaxies and other astronomical knowledge for the benefit of the public, so that future generations can understand more knowledge about celestial phenomena. Well todayKnowledge of horoscopesWith a diameter of 50 kiloparsecs (160,000 light-years), twice the diameter of the Milky Way, the Andromeda Galaxy is the largest galaxy in the local group, about 2.2 million light-years away. It is our closest neighbor in the Milky Way. It can be seen with the naked eye, and it resembles a faint elliptical spot.

It was discovered by astronomers long ago, and Messier numbered it on August 3, 1764. The Andromeda Galaxy is the closest large galaxy to our Milky Way. The Milky Way is thought to look very similar to the Andromeda Galaxy, and together they dominate the local group of galaxies.

The light that pervades the Andromeda Galaxy is the result of hundreds of billions of stellar members. The bright stars surrounding the image of the Andromeda Galaxy are actually stars in our Milky Way, much closer than the objects in the background. The Great Andromeda Galaxy is also known as M31 because it is the 31st diffuse object in the famous Messier Cluster Nebula Catalog.

M31 is quite far away, and it would take 2 million years for the light emitted from it to reach Earth. The stars in the nebula can be divided into about 20 communities, which means that they may come from smaller galaxies engulfed by the Andromeda Galaxy, numbered M31 in the Messier Catalog and NGC224 in the New General Catalog of Nebula Clusters, customarily known as the Great Andromeda Nebula. The Andromeda Galaxy and the Milky Way have many similarities, and a comparative study of the two can provide important clues to understand the movement, collapse structure and evolution of the Milky Way.

Year 1786,. Herschel was the first to include it in nebulae that can be broken down into stars. In 1924, Hubble identified the Cepheid variable star on the spiral arm of the Andromeda Galaxy on a photographic negative, and calculated the distance based on the circumferential light relationship, confirming that it was a star system outside the Milky Way.

In 1944, Bard identified the celestial objects in the core of the Andromeda Galaxy, identifying star clusters and stars. M31 has an important place in the history of astronomy. In 1786, Herschel was the first to include it in a nebula that could be broken down into stars.

In 1924, Hubble identified the Cepheid variable star on the spiral arm of M31 on a photographic negative, and calculated the distance based on the circumferential light relationship, confirming that it was a star system outside the Milky Way. Modern determination of its distance is 670 kiloparsecs (2.2 million light-years).

The starry sky of autumn night does not have as many bright constellations as the starry sky of spring and summer, and a group of royal constellations is the biggest feature of the starry sky on autumn night. The protagonists of these royal constellations are the kings, queens, and princesses of ancient Ethiopia, as well as the warriors who rescue the princess from the hands of sea monsters, known as the immortals. Among a number of royal constellations such as Cassiopeia, Cassiopeia, Andromeda, Perseus, etc., Andromeda has become the most eye-catching constellation because of its M31.

The Great Andromeda Nebula is roughly located in the center of the constellation Andromeda and can be seen over a wide area north of 48°S.

In order to be able to find the Great Nebula Andromeda in the midst of the vast array of stars, we need to first familiarize ourselves with the autumn night starry sky. The Milky Way on an autumn night has turned to the northeast, and you can see Cassiopeia "swimming" in the Milky Way, with five fairly bright stars arranged in the shape of the English letter "W", which is easily recognizable. The west of Cassiopeia is the constellation of Cassiopeia, and the eastern side is the constellation Perseus.

Not far to the south of the Silver River, there are four bright stars arranged in an obvious quadrangle, which is the famous autumn quadrangle. The three stars in the quadrilateral all belong to the constellation Pegasus, and only the one in the northeast corner is Andromeda A. The visual magnitude of Andromeda A is 2nd magnitude, white.

About 12 degrees north of Andromeda A and about 5 degrees to the east, there is a double star of the third magnitude, which is the Andromeda star, which is called "Tianda General" in Chinese. We should pay special attention to the fact that the Andromeda Nebula M31 is very close to it, just 1° to the west.

The Great Andromeda Nebula has a total magnitude of 4 magnitude and an average brightness of 6 per unit area, and a clear and moonless night is faintly visible to the naked eye, like a small white cloud. Its soft silvery-white oval shape can be seen through a small astronomical telescope. The Great Andromeda Nebula is a typical spiral galaxy, but because it is facing us sideways, it is not easy to see its spiral arms.

Some of its structures can be seen through larger aperture telescopes, such as its core is particularly bright and gets brighter towards the center, as well as some spiral arms, black dust lines, globular clusters, and stellar clouds. Two of its dwarf galactic companions can also be seen, a small, round, dense elliptical galaxy M32 to the south of the core of M31, and a slightly fainter but larger and longer elliptical galaxy M110 to the northwest of M31. There are also many fainter stars in the Milky Way that fill this celestial zone, adding to the fascinating color of the Great Andromeda Nebula.