Deep Sky Object in Spring
Abell 1185 (Galaxy Cluster in Ursa Major)


Date & Time: Jan 24 2009, from 25:00 to 25:31 JST(+0900)
Composed 4 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 D50 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3008×2000)
CCD Sensitivity...ISO1600




Abell 1185 / Galaxy Cluster, type 1 2 II
R.A.11h 10m 48.0s
Dec.+28° 40' 00"
Apparent Size28.0'
# of Galaxies52
Red Shift0.0313
Magnitude14.3
Distance430 million light yrs.
Galactic superclusterLeo supercluster
Abell 1185 is a small-scaled galaxy cluster positioned at a boundary between Ursa Major and Leo. The cluster is about 430 millions light years away, contains about 50 member galaxies in 30 arc minutes in apparent diameter. Members with NGC numbers are about 14th magnitude or so in brightness.
You can see a galaxy pair of NGC3561 and 3561A in northeast edge of the cluster, the pair has been warped by their interaction. A tail-like structure is stretched in northern direction from NGC3561A. We have a number of Arp105 of peculiar galaxies in this minor galaxy pair.

Numbers with 4 digits represent NGC #




Abell 779

Coma Cluster


Copyright(c) 2009 by Naoyuki Kurita, All rights reserved.
To top page To Deepsky in Spring index Ursa Major