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File:M15_Globular_Cluster_from_the_Mount_Lemmon_SkyCenter_Schulman_Telescope_courtesy_Adam_Block.jpg · Wikimedia Commons · See Wikimedia Commons

EntityQ11332· pop 59· linked from 478 articles

Messier 15

Also known as M15

Globular cluster

AI overview

Messier 15 is a dense, spherical collection of hundreds of thousands of old stars held together by gravity, located about 35,000 light-years away in the constellation Pegasus. Astronomers study it to better understand how stars form and evolve in these ancient stellar systems, and it's notable for containing a planetary nebula—a rare feature for a globular cluster.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Instance of: globular cluster
Part of: Milky Way
Constellation: Pegasus
Distance from Earth: 33300
Radius: 87.5
Image: Messier 15 HST.jpg

Show 15 more facts

Commons category: Messier 15
catalog code: [KPS2012] MWSC 3518
declination component of proper motion: -7.567
discoverer or inventor: Giovanni Domenico Maraldi
time of discovery or invention: 1746-09-07
Commons gallery: Messier 15
apparent magnitude: 6.288
spectral class: IV
radial velocity: -106.6
absolute magnitude: -9.11
metallicity: -2.10
right ascension: 322.493042
declination: 12.167000
epoch: J2000.0
right ascension component of proper motion: -0.46

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Encyclopedic overview

Messier 15 or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster) is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier's catalogue of comet-like objects in 1764. At an estimated 12.5±1.3 billion years old, it is one of the oldest known globular clusters.

Characteristics

Excerpted from Wikipedia’s “Messier 15” article, available under the CC BY-SA 4.0 licence.