Where is the Andromeda galaxy located?

Andromeda galaxy, also known as Andromeda nebula. Visible to the naked eye, the brightness is 4, which looks like a dim and fuzzy galaxy.

Andromeda galaxy is a huge spiral galaxy located in Andromeda. The coordinates of the celestial sphere are right ascension Oh40mO and declination+4100 ′ (1950.0). The apparent magnitude mv is 3.5. The naked eye looks like a faint oval spot. In the photo, it appears as an sb galaxy with an inclination of 77, the size of which is 160' times 40', and two thin and tight spiral arms extend from the bright nucleus, with the range of 245' times 75'. 1786 was listed as a nebula that can be decomposed into stars, and 1924 was confirmed as an extragalactic star system. Now it has a distance of 2.2 million light years (670,000 parsec) and a diameter of 6.5438+0.6 million light years (50 parsec), which is twice that of the Milky Way and the largest in this galaxy group. In recent years, it has been found that the heavy element content of Andromeda galaxy members gradually increases from the periphery to the center. 19 14 found that it has rotating motion. According to the current estimation, the mass of Andromeda galaxy is not less than 3. 1 times101solar mass, which is the largest in this galaxy group.

There is a star-like core in the center of Andromeda galaxy, with an absolute magnitude of MV =- 1 1, a diameter of only 25 light years (8 parsec), and a mass equivalent to 107 sun, that is, 1500 stars are gathered in a cubic parsec. The infrared radiation of the star-like core is very strong, which is about equal to the radiation of the whole core area of the Milky Way. But the radio there is only 1/20 of Silver Heart Radio. Andromeda galaxy has two dwarf galaxies-NGC221(M32) and NGC205, which are classified as E2 and E5P respectively. In this galaxy group, Andromeda and other galaxies also form the so-called Andromeda subgroup.