Deep Sky Object in Summer
M12 (Globular Cluster in Ophiuchus)

Date & Time: Apr 16 2004, from 24:34 to 24:41 JST(+0900)
Composed 2 shots with 5 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Fujifilm FinePix S2 Pro
Location: Ooizumi vil., Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO1600, White Balance...Auto

M12 (NGC6218) / Globular Cluster, type IX
R.A.16h 47m 11.9s (2000.0)
Dec.-01° 57' 00" (2000.0)
Apparent Size9.3'
Real Size98 light yrs.
Distance19,000 light yrs.
M12 is a medium-sized globular cluster found in the pentagon of a constellation of Ophiuchus. The cluster is positioned at 3.5 degrees northwest of another globular of M10, and C. Messier discovered M12 just next day when he found M10.
M12 is a globular that member stars are gathering very sparse, and you will be able to understand the fact if you compare that with M10. You can appreciate several star-chains are extending outward from the center with about 5 inches telescopes. Although the Ophiuchus pentagon contains three Messier's Globular clusters, it can be said that you can enjoy the M12 most easily in those.


M13(The Hercules Cluster)

Copyright(c) 2004 by Naoyuki Kurita, All rights reserved.
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