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Contains:  M 15, NGC 7078
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M15, 





    
        

            Jirair Afarian
M15

M15

Technical card

Resolution: 5419x3627

Dates:May 15, 2018

Frames:Badaar Moon and SkyGlow Badaar: 6x300" (gain: 11.00) bin 1x1

Integration: 0.5 hours

Darks: ~10

Flats: ~20

Bias: ~50

Avg. Moon age: 0.00 days

Avg. Moon phase: 0.00%

Bortle Dark-Sky Scale: 6.00

Mean FWHM: 7.00

Temperature: 12.00

Astrometry.net job: 2062979

RA center: 322.492 degrees

DEC center: 12.144 degrees

Pixel scale: 0.784 arcsec/pixel

Orientation: 206.989 degrees

Field radius: 0.710 degrees

Locations: Home Observatory, Newmarket, Ontario, Canada

Data source: Backyard

Description

Messier 15 or M15 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 12.0 billion years old, it is one of the oldest known globular clusters. 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 (112) and pulsars(8) , including one double neutron star system, M15 C

Comments

Author

Jir11
Jirair Afarian
License: None (All rights reserved)
290
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Revisions

  • M15, 





    
        

            Jirair Afarian
    Original
  • M15, 





    
        

            Jirair Afarian
    B
  • Final
    M15, 





    
        

            Jirair Afarian
    C

Sky plot

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Histogram

M15, 





    
        

            Jirair Afarian