Astrophysics (Index)About

Messier 15

(M15, NGC 7078)
(globular cluster with collapsed core)

Messier 15 (M15 or NGC 7078) is a globular cluster, unusual for the dense packing of stars in the center (the profile of the density rising all the way to the center), apparently having experienced a core collapse, a collapse of the middle region of a globular cluster. (Globular clusters typically have a central region of a high but constant density of stars.) It includes 100,000+ stars, including a planetary nebula, some pulsars, and variable stars. Its estimated age is 12 gigayears and it has a diameter of about 175 ly.


(globular cluster)
Further reading:
https://en.wikipedia.org/wiki/Messier_15
https://ui.adsabs.harvard.edu/abs/2003ApJ...582L..21B/abstract
https://hubblesite.org/contents/news-releases/1995/news-1995-06.html
http://blackholes.stardate.org/objects/factsheet-M15.html
RedshiftParsecs
/Distance
Lightyears
/Lookback Years
  
~010kpc30.0klyMessier 15
Coordinates:M15
J212958.33+121001.2

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