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M4 Globular Cluster in Scorpius, 



    
        

            Sigga

M4 Globular Cluster in Scorpius

Getting plate-solving status, please wait...
M4 Globular Cluster in Scorpius, 



    
        

            Sigga

M4 Globular Cluster in Scorpius

Imaging telescopes or lenses: Takahashi FSQ85ED

Imaging cameras: SBIG STF-8300C

Mounts: Takahashi EM-11 Temma II

Software: DeepSkyStacker, GIMP, Fitswork, Pixlr, Lightroom

Accessory: Reading Glasses!!!


Dates:April 20, 2017

Frames: 4x240" (16')

Integration: 16'

Avg. Moon age: 23.16 days

Avg. Moon phase: 39.29%


Basic astrometry details

Astrometry.net job: 1547381


Resolution: 1600x1200

Description

Messier 4 or M4 (also designated NGC 6121) is a globular cluster in the constellation of Scorpius. It was discovered by Philippe Loys de Chéseaux in 1745 and catalogued by Charles Messier in 1764. It was the first globular cluster in which individual stars were resolved.

M4 is a rather loosely concentrated cluster of class IX and measures 75 light years across. It features a characteristic "bar" structure across its core, visible to moderate sized telescopes. The structure consists of 11th magnitude stars and is approximately 2.5' long and was first noted by William Herschel in 1783. At least 43 variable stars have been observed within M4.

M4 is approximately 7,200 light years away, the same distance as NGC 6397, making these the two closest globular clusters to the Solar System. It has an estimated age of 12.2 billion years.[

--Wikipedia

More:

Messier4 - Wikipedia

Messier4 - Astropixels.com

Messier4 - SEDS

This is image #14 in long term project to photograph the complete Messier catalog.

Comments

Revisions

  • M4 Globular Cluster in Scorpius, 



    
        

            Sigga
    Original
  • Final
    M4 Globular Cluster in Scorpius, 



    
        

            Sigga
    B

B

Description: Well after some study seems the red gradient to left is correct and caused by Antares so time spent fixing in previous image was wrong! M4 Astropixels Site

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Histogram

M4 Globular Cluster in Scorpius, 



    
        

            Sigga