NGC 20 [SEP] constellation
NGC 20
NGC 20 is a lenticular galaxy located in the Andromeda constellation. It was discovered on 18 September 1857 by R. J. Mitchell. The observation by Lewis Swift in 1885 led to the duplicate listing of the galaxy as NGC 6.
NGC 171
NGC 171 is a barred spiral galaxy with an apparent magnitude of 12, located around 3 million light-years away in the constellation Cetus. The galaxy has 2 main medium-wound arms, with a few minor arms, and a fairly bright nucleus and bulge. It was discovered on 20 October 1784 by William Herschel. It is also known as NGC 175.
See also.
- Spiral galaxy
- List of NGC objects (1–1000)
- Cetus (constellation)
External links.