Deep Sky Object in Summer
M13 (Globular Cluster in Hercules)


Date & Time: Apr 30 2005, from 23:13 to 23:51 JST(+0900)
Composed 3shots with 10 minutes & 3shots with 3 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: Nikon D70 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 8bit TIFF(3008×2000)
CCD Sensitivity...ISO1000




M13 (NGC6205) / Globular Cluster, type V
R.A.16h 41m 42.0s (2000.0)
Dec.+36° 28' 00" (2000.0)
Apparent Size10'
Real Size98 light yrs.
Magnitude5.7
Distance22,000 light yrs.
M13 (NGC6205) is a spectacular globular cluster known as "The Hercules Cluster". It's universally acclaimed as the best globular in the Northern Hemisphere, lies on a line between eta Herculis and zeta Herculis. The cluster has a size of about 10 arc minutes and about over 100 thousand fine stars, 22 thousand light years away.
Usual nebulae and star clusters in our Galaxy are distributed in the disk being spiral structure. However, almost all of globular clusters, including M13, don't obey this rule, they equally distribute in the gigantic sphere region called "Halo" that encloses whole the Galaxy. Stars included in the globular clusters are very old normally over 10 billion years, about equal with the Galaxy itself. So the globular cluster should be one of the most important objects to research for origin of formation of the Galaxy.




M12

M14


Copyright(c) 2005 by Naoyuki Kurita, All rights reserved.
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