Deep Sky Object in Summer
Hercules Cluster (Abell 2151)

Date & Time: Jan 30 2004, from 28:12 to 28:32 JST(+0900)
Composed 3 shots with 8 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

Abell 2151 / Galaxy Cluster, type 2 1 III
R.A.16h 05m (rough position)
Dec.+17° 44' (rough position)
Apparent Sizeabout 60'
# of Galaxies87
Red Shift0.0215
Distance460 million light yrs.
Supergalactic clusterHercules Supercluster
The Hercules cluster is positioned near a border to Serpent Caput, contains a little less than 100 member galaxies in span of about 1 degree. The cluster is off about 3 degrees northeast from gamma Ser. Individual galaxy has a size of 1 or 2 arc minutes and dimmer than 14 th magnitude, large-ranged scopes can aid you to appreciate several members with your own eyes somehow. And the cluster has been estimated about 460 millions light years away.
Numbers with 4 digits represent NGC #

Corona Cluster(Abell2065)

Abell 2199

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