Deep Sky Object in Spring
NGC4490 (Galaxy in Canes Venatici)

Date & Time: Mar 20 2009, from 22:43 to 23:19 JST(+0900)
Composed 4shots with 12 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon & Skyglow filter
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 8bit TIFF(3008×2000)
CCD Sensitivity...ISO1600

NGC4490 / Galaxy, type SB(s)d pec III
R.A.12h 30m 36.6s (2000.0)
Dec.+41° 38' 23" (2000.0)
Apparent Size6.3×3.1'
Radial Velocity809km/s
Distance25 million light yrs.
Group of GalaxiesCanes II Group
Other IDsUGC7651, MCG7-26-14
CGCG216-8, PGC41333
NGC4485 / Galaxy, type IB(s)m pec III-IV
R.A.12h 30m 31.5s (2000.0)
Dec.+41° 42' 02" (2000.0)
Apparent Size2.3×1.6'
Radial Velocity725km/s
Distance25 million light yrs.
Group of GalaxiesCanes II Group
Other IDsUGC7648, MCG7-26-13
CGCG216-7, PGC41326
NGC4490 is a galaxy with a unique shape lying about a bit closer than 6 degrees northwest of Cor Caroli. NGC4490 has a long axis of about 6 arc minutes and a visual brightness of 10.3th magnitude. It's a major characteristic that the galaxy has a companion galaxy of NGC4485 with 12.5th magnitude in just north.
These two galaxies have gravitational interaction each other, the influence made arms of NGC4490 stretched and distorted. This apparent feature is made when two galaxies pass each other, not a head-on collision.



Copyright(c) 2009 by Naoyuki Kurita, All rights reserved.
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