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M15 Constellation  Pegasus (Globular Cluster), 



    
        

            AlBroxton

M15 Constellation Pegasus (Globular Cluster)

Technical card

Imaging telescopes or lenses:Celestron C11 Celestron

Imaging cameras:60Da Canon

Mounts:CGEM Celestron

Guiding telescopes or lenses:80mm EON Orion

Guiding cameras:Orion Star Shooter

Focal reducers:6.3 reducer Celestron

Software:Deep Sky StackerphotoshopNoel's Tools5.00 Images Plus


Dates:May 17, 2013

Frames: 27x60" bin 0x0

Integration: 0.5 hours

Avg. Moon age: 6.74 days

Avg. Moon phase: 43.21%


Basic astrometry details

Astrometry.net job: 3386132


Resolution: 1200x733

Data source: Backyard

Description

Messier 15 or M15 (also designated NGC 7078) 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 13.2 billion years old, it is one of the oldest known globular cluster. M15 is about 33,600 light-years from Earth, and 175 light years in diameter. It has an absolute magnitude of -9.2, which translates to a total luminosity of 360,000 times that of the Sun. Messier 15 is one of the most densely packed globulars known in the Milky Way galaxy. Its core has undergone a contraction known as 'core collapse' and it has a central density cusp with an enormous number of stars surrounding what may be a central black hole. Home to over 100,000 stars, the cluster is notable for containing a large number of variable stars and pulsars, including one double neutron star system, M15 C. M15 also contains Pease 1, the first planetary nebula discovered within a globular cluster in 1928. Just three others have been found in globular clusters since then.

Comments

Author

AlBroxton
AlBroxton
License: None (All rights reserved)
11464
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Revisions

  • M15 Constellation  Pegasus (Globular Cluster), 



    
        

            AlBroxton
    Original
  • M15 Constellation  Pegasus (Globular Cluster), 



    
        

            AlBroxton
    B
  • M15 Constellation  Pegasus (Globular Cluster), 



    
        

            AlBroxton
    C
  • Final
    M15 Constellation  Pegasus (Globular Cluster), 



    
        

            AlBroxton
    D

Histogram

M15 Constellation  Pegasus (Globular Cluster), 



    
        

            AlBroxton