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It was originally named the Andromeda Nebula and is cataloged as Messier 31, M31, and NGC 224. Andromeda has a D 25 isophotal diameter of about 46.56 kiloparsecs (152,000 light-years ) [ 8 ] and is approximately 765 kpc (2.5 million light-years) from Earth.
The most famous deep-sky object in Andromeda is the spiral galaxy cataloged as Messier 31 (M31) or NGC 224 but known colloquially as the Andromeda Galaxy for the constellation. [53] M31 is one of the most distant objects visible to the naked eye, 2.2 million light-years from Earth (estimates range up to 2.5 million light-years). [54]
If you are too close to the display when it is on, it can look as though you're viewing it through a screen door. [ 49 ] [ 53 ] Even with different HDTV display technology, such as front or rear projection DLP , LCoS or laser TV , the way HDTV images are rendered limits how close a viewer can be before the image's segmented nature becomes evident.
The "primary service area" is the area served by a station's strongest signal. The "city-grade contour" is 70 dBμ (decibels relative to one microvolt per meter of signal strength) or 3.16mV/m (millivolts per meter) for FM stations in the United States, according to Federal Communications Commission (FCC) regulations.
For example, Messier 1 is a supernova remnant, known as the Crab Nebula, and the great spiral Andromeda Galaxy is M31. Further inclusions followed; the first addition came from Nicolas Camille Flammarion in 1921, who added Messier 104 after finding Messier's side note in his 1781 edition exemplar of the catalogue.
See also: Globular cluster, List of globular clusters Mayall II , also known as NGC-224-G1 , SKHB 1 , GSC 2788:2139 , HBK 0-1 , M31GC J003247+393440 or Andromeda's Cluster , is a globular cluster orbiting M31, the Andromeda Galaxy .
M32 is a satellite galaxy of the Andromeda Galaxy (M31) and was discovered by Guillaume Le Gentil in 1749. The galaxy is a prototype of the relatively rare compact elliptical (cE) class. Half the stars concentrate within inner core with an effective radius of 330 light-years (100 pc).
the sky is light gray or orange – one can easily read; stars forming familiar constellation patterns may be weak or invisible; M31 and M44 are barely glimpsed by an experienced observer on good nights; even with a telescope, only bright Messier objects can be detected; limiting magnitude with 12.5" reflector is 13; 9 Inner-city sky 4.0