Deep Sky Object in Spring
NGC3631 (Galaxy in Ursa Major)


Date & Time: Jan 12 2013, from 25:32 to 26:12 JST(+0900)
Composed 6 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: Canon EOS 600D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO1600




NGC3631 / Galaxy, type SA(s)c I-II
R.A.11h 21m 02.9s (2000.0)
Dec.+53°10' 10" (2000.0)
Apparent Size5.0×4.7'
Radial Velocity+1143km/s
Magnitude11.0
Distance70 million light yrs.
Group of GalaxiesUrsa Major N Group
Other IDsUGC 6360, CGCG 268-21
Arp 27, MCG +9-19-47
IRAS 11181+5326, PGC 34767
NGC3631 is a medium sized face-on galaxy in central region of Ursa Major. We can find the galaxy out at about 5 degrees west from gamma UMa, a star that marks one of the cup of Big Dipper. The galaxy has a visual diameter of 5 arc minutes and a brightness of about 11th magnitude. Although you can detect the galaxy as only lump of light with telescope aided eyes, this image shows us the galaxy has clear spiral structures.




NGC3486

NGC3642


Copyright(c) 2013 by Naoyuki Kurita, All rights reserved.
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