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Dale Conrad | all galleries >> Dale Conrad's Astrophoto Gallery >> Gallery of Star Clusters > M92
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2011/05/18 D.M.Conrad

M92

Sedro-Woolley, Wa.

M92 also known as NGC6341, is about 27,000 light years away in the constillation Hercules.
Johann Elert Bode discovered this cluster in 1777 and Charles Messier independantly found and catalogued the cluster as M92 in 1781.
Estimates as the the clusters age range from 12 to 16 billion years. This is interesting since the age of the of the entire universe is estimated to be 13 to 14 billion years.
Guess this gives creedence to an astophysical estimate being equivalent to "damned if I know".
The field of view of this image is about 1 by 1.5 degrees with stars to the 17th to 18th magnitude. Galaxys are visible to about the 16th magnitude.
The moon was almost full and the sky was pretty jumpy. This picture turned out better than I expected.

Hutech Clear Filter 40D,Skywatcher 120ED @ F6.6 Borg reducer (7887)
20 5 minutes exposures, 15 flats, and 12 darks, stacked and pre-processed with Nebulosity
Final processing with Canon DPP
Baader IR/UV filter
Older Mountain Instruments MI=250 guided by a Starshoot autoguider on a Bort 77Ach hide exif

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other sizes: small medium large original auto
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