Hemisphere:  Northern  ·  Constellation: Hercules (Her)
M22 in Sagittarius , 



    
        

            AlBroxton
M22 in Sagittarius
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M22 in Sagittarius

Technical card

Imaging telescopes or lenses: Celestron C11 Celestron

Imaging cameras: 40D Canon

Mounts: CGEM Celestron

Guiding telescopes or lenses: 80mm EON Orion

Focal reducers: 6.3 reducer Celestron

Software: photoshop  ·  Deep Sky Stacker


Dates:July 11, 2018

Frames: 11x70" (12' 50")

Integration: 12' 50"

Avg. Moon age: 27.64 days

Avg. Moon phase: 4.01%


Basic astrometry details

Astrometry.net job: 2327027

RA center: 17h 6' 36"

DEC center: +37° 53' 13"

Pixel scale: 1.834 arcsec/pixel

Orientation: 64.393 degrees

Field radius: 0.259 degrees


Resolution: 750x686

Description

Messier 22 (also known as M22 or NGC 6656) is an elliptical globular cluster in the constellation Sagittarius, near the Galactic bulge region. It is one of the brightest globulars that is visible in the night sky. M22 was one of the first globulars to be discovered in 1665 by Abraham Ihle and it was included in Charles Messier's catalog of comet-like objects on June 5, 1764. It was one of the first globular clusters to be carefully studied first by Harlow Shapley in 1930. He discovered roughly 70,000 stars and found it had a dense core. Then Halton Arp and William G. Melbourne continued studies in 1959. Because of the large color spread of its red giant branch (RGB) sequence, which is similar to that observed in Omega Centauri, it became the object of intense scrutiny starting in 1977 with James E. Hesser et al.

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M22 in Sagittarius , 



    
        

            AlBroxton