M 92

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Messier 92 (also known as M92, M 92, or NGC 6341) is a globular cluster of stars in the northern constellation of Hercules.

It was discovered by Johann Elert Bode on December 27, 1777, then published in the Jahrbuch during 1779. It was inadvertently rediscovered by Charles Messier on March 18, 1781, and added as the 92nd entry in his catalogue. William Herschel first resolved individual stars in 1783.

It is one of the brighter of its sort in apparent magnitude in the northern hemisphere and in its absolute magnitude in the galaxy, but it is often overlooked by amateur astronomers due to angular proximity to bright cluster Messier 13, about 20% closer. Though when compared to M13, M92 is only slightly less bright, but about 1/3 less extended. It is visible to the naked eye under very good viewing conditions. With a small telescope, M92 can be seen as a nebulous smudge even in a severely light-polluted sky, and can be further resolved in darker conditions.

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Date : June 2023
Location : Backridge Observatory, Spruce Knob, West Virginia

Equipment used :
 Lens or telescope -- Homemade 16" Newtonian with MPCC
 Mount -- AP 1200
 Camera -- ZW0 2600MC with ZWO 174 off-axis guider

Acquistion Software : ACP, MaxIm DL, Focusmax
Processing Software : PixInsight, Photoshop

Exposure Detail : Total hours  1  One Shot Color