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Dimensions1915 x 1506
Original file size1.35 MB
Image typeJPEG
M15 in Pegasus

M15 in Pegasus

Canon 350D Hap Griffin Baader Mod
10x180sec at iso 1600
30 Darks/Flats/Bias
Celestron 9.25 reduced 0.63


Discovered by Jean-Dominique Maraldi in 1746, globular cluster Messier 15 (NGC 7078) is at a distance of about 33,600 light years. Its diameter is about 175 light-years. Its brightest stars are about of apparent magnitude 12.6 or absolute magnitude -2.8 or a luminosity of 1,000 times that of our Sun. The globular cluster is approaching us at 107 km/sec. An intermediate-mass black hole lies at the core, with a mass about 4,000 times that of the the Sun. M15 contains 9 known pulsars, neutron stars which are the remnants of ancient supernova explosions from the time when the cluster was young.

M15 is perhaps the densest of all (globular) star clusters in our Milky Way galaxy, and it took the Hubble Space Telescope to photographically resolve its superdense core.

September 22, 2008