NGC 221 - elliptical galaxy in the constellation Andromeda NGC 221 was discovered on 29 October 1749 by the French astronomer Guillaume Le Gentil. This is the 8th-sized compact elliptical galaxy of type E2 in the constellation Andromeda. It is a satellite galaxy M31 in the vicinity of the target. Dreyer described in the catalog as an object but a very very very bright, large, round, quite suddenly and significantly brighter center and the nucleus. NGC 221 observed using the 35-cm reflector appears to me ko object very bright, moderately large, elongated, suddenly increasing the brightness of the small surface of the nucleus having a stellar character. The galaxy lies at a distance of 24 seconds in a southerly direction from the center of M31. The galaxy consisting mainly of old stars, or white dwarfs and neutron stars. The spectrum of M32 indicates, however, that the galaxy also contains a population of younger stars 2-3 billion years, enriched in heavy elements. The galaxy was also able to find some planetary nebulae. M32 galactic nucleus to contain a black hole, and its weight is about 100 million solar masses with a density of about 5,000 solar masses at parsec. Mass of the galaxy has been estimated at about 3 billion solar masses and the diameter of the galaxy dates back to 7800 thousand light years and lies at a distance of less than 2.9 million light-years from the Solar System.
Posted on: Sun, 20 Jul 2014 19:35:23 +0000
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