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
relatively constant density of stars.)
It includes 100,000+ stars, including a known planetary nebula
and some known 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
http://www.messier.seds.org/m/m015.html
https://www.messier-objects.com/messier-15-great-pegasus-cluster/
http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=messier+15
Redshift | Parsecs /Distance | Lightyears /Lookback Years | | |
~0 | 11kpc | 36.0kly | | Messier 15 |
|
Coordinates: | M15 J212958.33+121001.2 |
|
Index