Deep Sky Object in Spring
Around NGC3733, 3756, Abell 1318 (Galaxies & Galaxy Cluster in Ursa Major)


Date & Time: Jan 31 2020, from 25:03 to 27:01 JST(+0900)
Mosaic of 2 flames 10 shots composed 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


This image captured medium-scaled galaxies and a galaxy cluster floating at 3 degrees WNW from gamma Uma (Phecda) which forms the Big Dipper. Both of NGC3733 and NGC3756 are spiral galaxies with long axes of a bit longer than 4 arc minutes and brightnesses of 12th class magnitude. They are members of the Ursa Major North Group, floating around 50 to 70 million light years away. You can see another irregular galaxy of NGC3738 between them.
In the northern part of image, a galaxy cluster of Abell 1318 is lying just east of NGC3733. Almost member galaxies seem tiny rice grains except comparatively striking ones of NGC3737 or NGC3759. The cluster contains about 50 galaxies in a span of 26 arc minutes. The distance has been estimated as approximately 787 million light years.
(4 digits in image indicate NGC #)
NGC3733 / Galaxy, type SAB(s)cd:
R.A.11h 35m 01.8s (2000.0)
Dec.+54° 51' 08" (2000.0)
Apparent Size4.7×2.1'
Radial Velocity+1185km/s
Magnitude12.9
Distance56 million light yrs.
Group of GalaxiesUrsa Major N Group
Other IDsUGC 6554, CGCG 268-55
MCG +9-19-123, PGC 35797
NGC3738 / Galaxy, type Im
R.A.11h 35m 48.5s (2000.0)
Dec.+54° 31' 27" (2000.0)
Apparent Size2.5×1.7'
Radial Velocity+218km/s
Magnitude11.7
DistanceN/A
Group of Galaxies -
Other IDsUGC 6565, CGCG 268-60
Arp 234, MCG +9-19-130
IRAS 11330+5448, PGC 35856
NGC3756 / Galaxy, type SAB(rs)bc
R.A.11h 36m 48.5s (2000.0)
Dec.+54° 17' 46" (2000.0)
Apparent Size4.2×2.2'
Radial Velocity+1071km/s
Magnitude12.1
Distance70 million light yrs.
Group of GalaxiesUrsa Major N Group
Other IDsUGC 6579, CGCG 268-63
MCG +9-19-134, IRAS 11340+5434
PGC 35931
Abell 1318 / Galaxy cluster, type 1 3 III
R.A.11h 36m 24.0s (2000.0)
Dec.+54°57' 00" (2000.0)
Apparent Size25.8'
# of Galaxies56
Red Shift0.058
Magnitude15.0
Distance787 million light yrs.
Supergalactic clusterUrsa Major supercluster



NGC3726
NGC3877

Copyright(c) 2020 by Naoyuki Kurita, All rights reserved.
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