Deep Sky Object in Spring
NGC4145 & NGC4151 (Galaxies in Canes Venatici)


Date & Time: Apr 10 2021, from 24:06 to 25:13 JST(+0900)
Composed 11 shots with 6 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 & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


NGC4145 / Galaxy, type SAB(rs)d
R.A.12h 10m 01.6s (2000.0)
Dec.+39°53' 01" (2000.0)
Apparent Size5.8×4.2'
Radial Velocity+925km/s
Magnitude11.8
Distance68 million light yrs.
Group of GalaxiesNGC4151 Group
Other IDsUGC 7154, CGCG 215-42
MCG +7-25-40, PGC 38693
NGC4151 / Galaxy, type (R')SAB(rs)ab:
R.A.12h 10m 32.5s (2000.0)
Dec.+39°24' 21" (2000.0)
Apparent Size6.5×5.0'
Radial Velocity+956km/s
Magnitude11.5
Distance62 million light yrs.
Group of GalaxiesNGC4151 Group
Other IDsUGC 7166, CGCG 215-45
MCG +7-25-44, PGC 38739
This image shows you two spiral galaxies paralleling in north south direction with an interval of 30 arc minutes at the western edge of Canes Venatici. A northern NGC4145 has an elliptical shape with a long axis of a bit smaller than 6 arc minutes. Another southern one has an ID of NGC4151, having an elliptical central bulge and extraordinary dimmed arms wound around it. The galaxy is one of the closest Seyfert galaxies in which the massive black holes are positioned. The bulge of NGC4151 resembles a human's eye, it has given a nick name of "Eye of Sauron" by a character of The lord of the Rings.

⇒ Display the spectral profile of NGC4151 (in new window)



NGC4136
NGC4157

Copyright(c) 2021 by Naoyuki Kurita, All rights reserved.
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