Deep Sky Object in Spring
NGC4731 (Galaxy in Virgo)

Date & Time: Apr 29 2008, from 23:17 to 24:16 JST(+0900)
Composed 8 shots with 8 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1760mm, F6.9)
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D80 (Remodeled)
Location: Ooizumi vil., Yamanashi pref.

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

NGC4731 / Galaxy, type type SB(s)d pec III
R.A.12h 51m 00.0s (2000.0)
Dec.-06° 23' 34" (2000.0)
Apparent Size6.6×3.2'
Radial Velocity+1438km/s
Distance75 million light yrs.
Group of GalaxiesNGC4697 Group
Other IDsUGCA 302, MCG -1-33-26
IRAS 12484-607, PGC 43507
A unique-shaped dimmed galaxy is NGC4731, belonged to NGC4697 group in southern part of Virgo. The galaxy has very loosely coiled arms, and a long axis of about 6 arc minutes, fairly larger in galaxies distributed in southern Virgo vicinity. And the galaxy has a brightness of 12th magnitude but its arms are dimmed, we need larger ranged telescopes to observe its shape with naked eyes.



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