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Contains:  M 12, NGC 6218
Getting plate-solving status, please wait...
Messier 12 - NGC 6218 The Gumball Cluster, 





    
        

            Michael Feigenbaum
Messier 12 - NGC 6218 The Gumball Cluster

Messier 12 - NGC 6218 The Gumball Cluster

Technical card

Resolution: 4518x2934

Dates:May 23, 2019

Frames: 320x60"

Integration: 5.3 hours

Avg. Moon age: 19.28 days

Avg. Moon phase: 78.67%

Astrometry.net job: 2708821

RA center: 251.800 degrees

DEC center: -1.951 degrees

Pixel scale: 0.617 arcsec/pixel

Orientation: 324.090 degrees

Field radius: 0.462 degrees

Locations: Papago Butte, near Maricopa, AZ, United States

Data source: Backyard

Description

Yes, I like doing Globular Clusters, lol...

The Gumball Cluster is located about 15,700 ly away in Ophiucus. It contains approximately 200,000 stars.

Surprisingly, there are very few low mass stars and this may be because the cluster has passed through the Milky Way several times during which, many of the lower mass stars were stripped away by the gravitational attraction of the denser parts of the galaxy. There are, as in many globular clusters, a number of x-ray binaries in M12.

It is thought that this cluster has lost around 1 million stars during it's lifetime.

(this information was taken from "messier-objects.com" which is a very informative website)

As far as the imaging is concerned, I wanted to try to shorten the exposures and do more of them to see how that impacted the stars shape, color and noise. It seems the color is better than that which I obtained in other images using lnger exposures. With the small pixels of the 183, I think this is a good practice. The noise seemed to be easier to work with as well.

As always, comments and/or criticism is always encouraged...

CS!!
Mike

Comments

Author

MikeF29
Michael Feigenbaum
License: None (All rights reserved)
2677
Like

Revisions

  • Messier 12 - NGC 6218 The Gumball Cluster, 





    
        

            Michael Feigenbaum
    Original
  • Messier 12 - NGC 6218 The Gumball Cluster, 





    
        

            Michael Feigenbaum
    D
  • Messier 12 - NGC 6218 The Gumball Cluster, 





    
        

            Michael Feigenbaum
    E
  • Final
    Messier 12 - NGC 6218 The Gumball Cluster, 





    
        

            Michael Feigenbaum
    F

E

Completely reprocessed using some addition luminance frames. I culled the best 1/2 of 280 FWHM and made a luminance image. Then applied that to the entirety of the native OSC image that was also completely reprocessed. I think the difference is significant enough to publish this revision.

Sky plot

Sky plot

Histogram

Messier 12 - NGC 6218 The Gumball Cluster, 





    
        

            Michael Feigenbaum

In these public groups

Cloudy Nights
Fast Newtonians