Deep Sky Object in Spring
Shapley8 (Abell3558, Galaxy Cluster in Centaurus)

Date & Time: Jan 5 2008, from 28:25 to 29:179 JST(+0900)
Composed 6 shots with 10 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: Nikon D80 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...12bit CCD-RAW, converted to 16bit TIFF(3872×2592)
CCD Sensitivity...ISO1600

Abell 3558 / Galaxy Cluster, type 4 3 I
R.A.13h 27m 54.0s (rough position)
Dec.-31° 29' 00" (rough position)
Apparent Sizeabout 22'
# of Galaxies226
Red Shift0.0468
Distance640 million light yrs.
Galactic superclusterShapley supercluster
This image has captured a distant but extraordinary large scaled galaxy cluster of "Shapley 8" (Abell 3558) concealed in northern region of Centaurus. The cluster is positioned about 3 degrees southwest from M83, a spiral galaxy in tail of Hydra.
Shapley 8 is a principal cluster of "The Shapley galactic supercluster" about 650 millions light years away, contains over 200 member galaxies. The cluster has been classified "3" in richness class, has the most bright galaxies in all of Abell galaxy clusters. So we can take the picture of Shapley 8 with only small telescopes.
The Shapley super galaxy cluster had been researched by an American astronomer Harlow Shapley (1885-1972), and "discovered" as an independent super galaxy cluster in 1989.



Copyright(c) 2008 by Naoyuki Kurita, All rights reserved.
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