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M71 (NGC 6838) - Globular Cluster in Sagitta

LRGB combination (Click for a larger view 1600 x 1600 px)

 

100% crop - 800px / 800px

Details

M71 (NGC 6838)- Globular Cluster in Sagitta

Discovered by Philippe Loys de Cheseaux in 1746 and included by Charles Messier in his catalog of comet-like objects in 1780.

M71 (also known as Messier 71 or NGC 6838) is a globular cluster in the constellation Sagitta. M71 is at a distance of about 13000 light years away from Earth and spans some 27 light years across. The stars in Messier 71, as is usual in such clusters, are relatively old, at around 9 to 10 billion years, and consequently are low in elements other than hydrogen and helium.

Right Ascension 19:53:46 (h:m:s)
Declination +18:46:42 (deg:m:s)
Distance 13 (kly)
Visual Brightness B=7.91, V=6.1 (mag)
Apparent Dimension 7.2 (arc min)

Seeing: Pickering 7 rating - Good
Optic(s): RC 12" with Astro-Physics corrector @ f/5
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik LRGB set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-08-23
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 9 min, R = 9 min, , G = 9 min, , B = 9 min, subs. 3 min, Bin 1, Total Exposure Time - 36 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided
Processing:

PixInsight / PS

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All Contents copyright Velimir Popov unless otherwise noted.