Deep Sky Object in Spring
NGC4676 (The Mice in Coma Berenices)

Date & Time: Jan 31 2004, from 26:45 to 27:05 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

NGC4676A / Galaxy
R.A.12h 46m 10.2s (2000.0)
Dec.+30° 44' 00" (2000.0)
Apparent Size2.3×0.7'
Radial VelocityN/A
Distance300 million light yrs.
Group of GalaxiesN/A
Other IDsIC819, UGC7938
NGC4676B / Galaxy
R.A.12h 46m 11.3s (2000.0)
Dec.+30° 43' 28" (2000.0)
Apparent Size2.2×0.8'
Radial VelocityN/A
Distance300 million light yrs.
Group of GalaxiesN/A
Other IDsIC820, UGC7939
This picture shows you a extraordinary small-scaled colliding galactic pair concealed near a border of Coma Berenices and Canes Venatici. The pair has a brightness of at most 14th magnitude, it's fairly difficult object to catch in amateur telescopes. An upper one has a number of NGC4676A and lower galaxy is called NGC4676B.
This pair has a nickname of gThe Miceh because they have unique structures looks like long mouse's tail influenced by collided interactions. Especially a long and straight tail stretching toward north has an apparent length of 1.5 arc minutes, equivalent to about 100 or 150 thousand light years in real length. I have displayed a clear image of The Mice by Hubble Space Telescope (HST) below; you can appreciate detailed structure of tails. It's estimated that the unique pair is floating in outer space about 300 millions light years away.

The Mice captured by HST The Mice captured by HST

Around NGC4654


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