Deep Sky Object in Summer
M22 (Globular Cluster in Sagittarius)


Date & Time: Apr 28 2007, from 27:16 to 27:33 JST(+0900)
Composed 4 shots with 5 minutes exposed
Optical: TAKAHASHI 12.5cm(4.9") fluorite refractor (f=1000mm, F8.0)
Auto-guided with VIXEN ATLUX Equatorial & Meade Pictor 201XT
Digital Camera: Fujifilm FinePix S2 Pro
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO800, White Balance...Auto




M22 (NGC6656) / Globular Cluster, type VII
R.A.18h 36m 23.9s (2000.0)
Dec.-23° 54' 00" (2000.0)
Apparent Size17.3'
Real Size111 light yrs.
Magnitude5.9
Distance10,000 light yrs.
M22 (NGC6656) is a fine globular cluster, lies two degrees NE of lambda Sgr. The cluster is detected by naked eye under good condition, and looks like a dimmed nebula with binoculars. It is a highly concentrated group of about 70 thousand stars in total, about 10,000 light years away.
The cluster and M13, a great globular cluster in Hercules, have the culmination about simultaneously, It'll be very interesting to compare views of those clusters through a telescope.

-->Jump to Rendezvous of M22 with the Jupiter




M19

M28


Copyright(c) 2007 by Naoyuki Kurita, All rights reserved.
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