Pease 1 is a planetary nebula located within the globular cluster M15 33,600 light years away in the constellation Pegasus. It was the first planetary nebula known to exist within a globular cluster when it was discovered in 1928[2] (for Francis G. Pease), and just four more have been found (in other clusters) since.[1] At magnitude 15.5, it requires telescopes with an aperture of at least 300-millimetre (12 in) to be detected.[3]

References

  1. ^ a b c d "Globular Cluster M15 and Planetary Nebula Pease 1". www.astropix.com. Archived from the original on 2011-07-18.
  2. ^ O'Meara, Stephen James; Levy, David H. (1998), Deep-Sky Companions: The Messier Objects, Cambridge University Press, p. 74, ISBN 978-0521553322.
  3. ^ Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 0-00-717223-0.


Allikas: https://en.wikipedia.org/wiki/Pease_1
No tags for this post.