Deep Sky Object in Summer
M107 (Globular Cluster in Ophiuchus)

Date & Time: Mar 3 2006, from 27:20 to 27:40 JST(+0900)
Composed 3shots with 10 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 16bit TIFF(3008×2000)
CCD Sensitivity...ISO1250

M107(NGC6171) / Globular Cluster, type X
R.A.15h 17m 24.0s (2000.0)
Dec.-21° 01' 00" (2000.0)
Apparent Size2.2'
Real Size36 light yrs.
Distance56 thousand light yrs.
A tiny globular cluster of M107 is positioned at 2.6 degrees SSW of zeta Oph. The cluster has an apparent diameter of a bit larger than 2 arc minutes and a visual brightness of about 9, you can able to see it like a nebula only with binoculars. M107 has a concentration class of the tenth in twelve levels, fairly sparse globular. But the cluster is very small, so it's difficult to resolve member stars even if you see it through telescopes. There are various globular clusters around the field of Scorpius to Ophiuchus. M107 has a fairly poor appearance in those.



Copyright(c) 2006 by Naoyuki Kurita, All rights reserved.
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