Deep Sky Object in Spring
Coma Cluster

Data & Time: Feb 4 2006, from 28:10 to 28:59 JST(+0900)
Composed 6shots with 9 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: Fujifilm FinePix S2Pro
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO1600, White Balance...Auto

Abell 1656 / Galaxy Cluster, type 2 1 II
R.A.13h 00m (Rough position)
Dec.+28° (Rough position)
Apparent Sizeabout 120'
# of Galaxies106
Red Shift0.0232
Distance290 million light yrs.
Galactic SuperclusterComa Supercluster
This image has captured one corner of northern Coma Berenices. In here you can detect the Coma Cluster that contains about 100 tiny galaxies in 2 degrees in span.
The closest cluster of galaxies of Virgo Cluster is spread out with 10 degrees in diameter just south of Coma Cluster. The Coma Cluster has almost same scale with it, the distance to central region is estimated about 290 millions light years.
It's one of characteristics that the Coma Cluster contains many elliptical galaxies. But amateur telescopes can detect member galaxies as simple dimmed light spots. And it's noticeable that two large elliptical galaxies of NGC4874 and NGC4889 are lying in central region of the cluster.
"Cluster of galaxies" is one of cosmic structures several hundreds galaxies are gathering in scale of some ten millions light years. The local group of galaxies (LG) in which our Galaxy is included is a small-scaled galactic group that is positioned in a remote area of the Virgo Cluster. Actually the Virgo Cluster and LG form the "Virgo supercluster of galaxies", a larger cosmic structure in scale of hundred million light years or so. And this Coma Cluster is also a part of "Coma supercluster of galaxies". In short, it's neighbor supercluster of galaxies for us.

(Numbers of four digits are catalogue numbers of NGC, and numbers with an initial "I" represent those of IC.)

To image without stars

Abell 1185

Abell 1795

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