Deep Sky Object in Summer
Hercules Cluster (Abell 2151)


Date & Time: Apr 5 2019, from 26:46 to 27:40 JST(+0900)
Composed 10 shots with 6 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Canon EOS 6D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(3056×3056)
Device Size...20×20mm, Sensitivity...ISO4000


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
Magnitude13.8
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 #



Abell 2147 & Abell 2152
Abell 2162

Copyright(c) 2019 by Naoyuki Kurita, All rights reserved.
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