Object: 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 in 1777, then published in the Jahrbuch during 1779. The cluster was independently rediscovered by Charles Messier on March 18, 1781, and added as the 92nd entry in his catalog. M92 is at about 26,700 light-years away from Earth.
M92 is one of the brighter globular clusters in the northern hemisphere, but it is often overlooked by amateur astronomers because of its proximity to the even more spectacular Messier 13. It is visible to the naked eye under very good conditions.
Among the Milky Way population of globular clusters, Messier 92 is among the brighter clusters in terms of absolute magnitude. It is also one of the oldest clusters at the estimated age range of 11 ± 1.5 billion years.
Taken: September 25, 2020
Telescope: Astro-Tech 14” RC with Starizona Apex-ED L 0.65x focal reducer
Mount: Paramount ME II unguided
Camera: ZWO ASI1600MM-Pro (cooled to -10C; Unity Gain) Bin 1×1.
Focuser: Moonlite Nitecrawler
Rotator: Moonlite Nitecrawler
Filters used: Chroma Red, Green and Blue with a ZWO 2″ 7 position filter wheel
Exposures: 60×60 seconds Red; 60×60 seconds Green; 50×60 seconds Blue for a total exposure time of 2.83 hours; calibrated with 40 dark frames, 40 flat frames and 40 dark-flat frames.
Seeing Conditions:
Image capture and telescope control: Sequence Generator Pro and TheSkyX Pro
Processed with PixInsight, Photoshop CC 2020