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M92 (NGC 6341), Globular Cluster class IV, in Hercules

LRGB combination - spikes added (Click for a larger view 1200 x 1200 px)

 

Details

M92 (NGC 6341), Globular Cluster class IV, in Hercules

Discovered 1777 by Johann Elert Bode.

Globular cluster Messier 92 (M92, NGC 6341) is one of the more conspicuous globular clusters. Situated in constellation Hercules, it is nevertheless second only within that constellation, after bright M13. According to newer sources, M92 is about 26,000 light years distant, only little more than its brighter apparent neighbor M13. It may be a bit younger than M13. A semi-recent estimate of M92's age has given a value of about 16 billion years. M92 is a splendid object, visible to the naked eye under very good conditions and a showpiece for every optics. It is only slightly less bright but about 1/3 less extended than M13: its 14.0' angular extension corresponds to a true diameter of 109 light years, and may have a mass of up to 330 000 suns.

Right Ascension 17 : 17.1 (h:m)
Declination +43 : 08 (deg:m)
Distance 26.7 (kly)
Visual Brightness 6.4 (mag)
Apparent Dimension 14 (arc min)

Seeing: Pickering 8 rating - Good to Excellent
Optic(s): Celestron 11" Schmidt Cassegrain + TSSCKorr2" flattener @ f/8
Mount: ASA DDM85 Premium - operated by my friend Emil Ivanov
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomics L, R, G, B set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-04-26
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 15 min, R = 15 min, G = 15 min, B = 15 min, (Bin 1), Subexposures = 3 min, Total Exposure Time - 60 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided thanks to ASA DDM85 Premium mount
Processing:

PixInsight / PS

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