Star Clusters - celestialpixels
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M23 / NGC 6494 Open Cluster in Sagittarius

M23 / NGC 6494 Open Cluster in Sagittarius

Open cluster NGC 6494 in Sagittarius above is a rich dense cluster comprised of over 100 member stars which are of uniform brightness and well detached from the rich background sky. The cluster spans 30 arc-minutes in diameter or 15-20 light-years across. M23 lies at a distance of 2,150 light-years away and is dated at a mere 220-300 million years-old and as evidenced by the predominance of white hot stars in the image below. The cluster is best observed using low magnifications (50-100x) during mid-summer as it appoaches the southern meridian near midnight. NGC 6494 was discovered by Charles Messier in 1764.

Telescope: Officina Stellare Veloce RH200
Mount: Astrophysics Mach1 GTO
Guiding: TS-OAG9 / Lodestar
Camera: ATIK 383L+ Mono
Filters: Baader L-R-G-B-HA
Total Exposure: 3h
Subexposures: LRGB 3min
Location: Mt Parnon