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
Magnitude11.9
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.




NGC4710

NGC4753


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