Deep Sky Object in Summer
IC4665 (Open Cluster in Ophiuchus)


Date & Time: Apr 13 2002, 23:41 JST(+0900), 8min exp.
Optical: TAMRON SP f=300mm F2.8, Aperture: F3.5
Auto-guided with TAKAHASHI EM-200 Equatorial
Camera: VIXEN VX-1
Film: Ektachrome E200 (+1EV pushed)
Location: Koumi town, Nagano pref.




IC4665 / Open Cluster, type c, III 2 m
R.A.17h 46m 18.0s (2000.0)
Dec.+05° 43' 00" (2000.0)
Apparent Size41.0'
Real Size11.8 light yrs.
# of Stars30
Magnitude4.0
Distance990 light yrs.
IC4665 is a very sparse open cluster scattered at about a degree north of beta Oph. The cluster has a apparent diameter of about 40 arc minutes, you can enjoy that with a portable binocular. This IC4665 has only 30 member stars. Outward looks of the cluster would be almost same as the Milky Way flowing just next on east. But the cluster has a sufficient big size; we can take it only with small photo lenses easily.




NGC6940

IC4756, NGC6633


Copyright(c) 2002 by Naoyuki Kurita, All rights reserved.
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