How to locate Andromeda in space? A planet in Andromeda?

Andromeda has a main galaxy, M3 1 (Andromeda), which is one of the largest members of this galaxy group. Andromeda is characterized by two curves starting from Alpha, and you can easily find it from the connection between Cassiopeia and Polaris. not at all

Andromeda

Undoubtedly, the most famous galaxy in Andromeda should be M3 1, which is an extragalactic galaxy and as huge as the Milky Way. M3 1 is about 2 million light years away, and it is the farthest celestial body visible to the naked eye. M3 1 was once considered as a nebula, and the identity of its galaxy was not confirmed by Edwin Hubble until 1924. If we observe with simple binoculars, we can find that M3 1 is surrounded by two companion galaxies: M32 in the south and M 1 10 in the north. Among these interesting celestial bodies, it is certain that Andromeda γ is a binary star system, which consists of an orange giant star and a blue small star (as can be seen from the movement of γ star, but it requires some equipment). NGC 752 is also noteworthy. It is a huge open cluster, which contains more than 9, 100 stars, some of which are barely equal to 9, and the brightest is 8.54 (SAO 55080). There is a brighter star in the direction of the cluster, such as 8.07 (SAO 55 10 1), but it is not a member star and just coincides with the celestial sphere. The planetary cloud NGC 7662 can be observed with small equipment. Andromeda has already mentioned it when talking about the autumn quadrangle (see the constellation introduction of Pegasus). The alpha star that constitutes this quadrilateral is the brightest star in Andromeda, which extends northeast from the diagonal line from Alpha Pegasus to Alpha Andromeda in the quadrilateral, and the three bright stars of Andromeda (except for the delta of 3m, the other two are 2m stars) are almost all on this extension line. Further on, you will meet the great spirit of Perseus. Daling V, Perseus α and Andromeda γ form a right triangle. This Andromeda gamma star is a binary star, in which the main star is an orange star with a length of 2.3m and the companion star is a yellow star with a length of 5.1m.. Interestingly, this companion star is a "chameleon", which changes from yellow and gold to orange and blue, just like a clever magician. Andromeda's most famous celestial body is probably the Big Nebula. Near Andromeda υ, on a clear moonless night, we can see a small blue and white cloud, which is the Andromeda Nebula. This nebula was discovered by astronomers as early as 16 12, but it was not until the 1920s that American astronomer Hubble made it clear that it was completely different from the nebula in Sagittarius. It is a large galaxy 2.2 million light years away from us, so its correct name should be "Andromeda Extragalactic Galaxy". Andromeda, an extragalactic galaxy, has a diameter of 65.438+0.7 billion light years and contains more than 300 billion stars. Much like our Milky Way, it is also a vortex, and there are also many variable stars, clusters and nebulae. Interestingly, there are two small galaxies beside them, which together form a triple galaxy. Important main stars: Andromeda α: Alpharatz, Andromeda β: Mirach, Andromeda γ: Alamak-it is a binary star system with yellow main star and blue companion star. Andromeda δ: Quezon five Andromeda ε: Quezon four Andromeda ζ: Quezon two Andromeda η: Quezon I edited this passage to judge that the diameter of Andromeda galaxy is 500,000 parsec (654.38+0.6 million light years), which is twice the diameter of the Milky Way, and it is the largest galaxy in this galaxy group, about 2.2 million light years away from us. Andromeda galaxy has many similarities with the Milky Way. A comparative study of them can provide important clues for understanding the movement, structure and evolution of the Milky Way. 1786, F.W. Herschel first listed it as a nebula that can be decomposed into stars. 1924, Hubble recognized Cepheid variable on the spiral arm of Andromeda galaxy on photographic film, and calculated the distance according to the period-luminosity relationship, confirming that it is a star system outside the Milky Way. 1944, Budd distinguished the celestial bodies in the core of Andromeda galaxy and determined the clusters and stars in it.

Andromeda

Our Milky Way and Andromeda galaxy are approaching each other, and they may collide in about 3 billion years, and in the process of fusion, they will temporarily form a bright and complex hybrid galaxy. A series of stars will be scattered, and most of the free gas in the galaxy will be compressed to produce new stars. After several billion years, the spiral arms of galaxies will disappear, and two spiral galaxies will merge into a huge elliptical galaxy. The giant spiral galaxy in Andromeda (M3 1). The celestial coordinates of 1950.0 epoch are right ascension 0400 and declination +4 1 00. The apparent magnitude m is 3.5. Visible to the naked eye, it looks like a faint oval spot. In the photo, it is a Sb-type galaxy with an inclination of 77 (see classification of galaxies), the size is160 ′× 40 ′, and two thin and tight spiral arms extend from the bright nucleus, with a range of 245 ′× 75 ′. The number in messier catalog is M3 1, and the number in the new catalog of nebula clusters is NGC224, which is called the Andromeda Nebula, which is now the Andromeda galaxy. 1786, F.W. Herschel first listed it as a nebula that can be decomposed into stars. 1924, Hubble recognized Cepheid variable on M3 1 spiral arm on photographic film, and calculated the distance according to the period-luminosity relationship, confirming that it is a star system outside the Milky Way. The modern distance is 670,000 parsec (2.2 million light years). Its diameter is 50,000 parsec (654.38+0.6 million light years), twice that of the Milky Way and the largest in this galaxy group. In 1944, Budd determined the core celestial bodies of M3/kloc-0, and determined the star clusters and stars in it, and pointed out that the spatial distribution of star clusters was similar to that of the Milky Way. On the spiral arm of M3 1 is the extreme star group I, including O-B star (see the classification of star spectrum), bright Supergiant star, OB star concordance and ionization.