Deep Sky Object in Spring
Around NGC3898 & Abell 1377 (Galaxies & Galaxy Cluster in Ursa Major)


Date & Time: Dec 27 2019, from 26:40 to 27:35 JST(+0900)
Composed 10 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


I captured small galaxies and a galaxy cluster in single flame located in the square of the Big Dipper. NGC3898 in upper left hand side has the larger scale with long axis and brightness of 4.3 arc minutes and 11.6th magnitude, respectively. And you can detect others of NGC3888 and NGC3850 paralleling toward southwest (lower right direction). They are lying at about 70 million light years away.
The flame shows a small scaled galaxy cluster Abell 1377 in southern (lower) part. The cluster includes member galaxies seemingly rice grains of 60 or so in a span of 20 arc minutes. The distance to the cluster has been estimated as 787 million light years, approximately ten-times farther than galaxies mentioned above.
(4 digits in image indicate NGC #)
NGC3898 / Galaxy, type SA(s)ab I-II
R.A.11h 49m 15.4s (2000.0)
Dec.+56°05' 02" (2000.0)
Apparent Size4.3×2.5'
Radial Velocity+1163km/s
Magnitude11.6
Distance70 million light yrs.
Group of GalaxiesUrsa Major N Group
Other IDsUGC 6787, CGCG 268-88
CGCG 269-2, MCG +9-19-204
IRAS 11465+5621, PGC 36921
NGC3888 / Galaxy, type SAB(rs)c II
R.A.11h 47m 34.5s (2000.0)
Dec.+55°58' 01" (2000.0)
Apparent Size1.8×1.3'
Radial Velocity2404km/s
Magnitude12.0
Distance70 million light yrs.
Group of GalaxiesUrsa Major N Group
Other IDsUGC 6765, CGCG 268-85
MCG +9-19-189, IRAS 11449+5614
PGC 36789
NGC3850 / Galaxy, type SB(s)c:
R.A.11h 45m 36.5s (2000.0)
Dec.+55°53' 08" (2000.0)
Apparent Size2.2×1.1'
Radial Velocity+1156km/s
Magnitude14.0
Distance70 million light yrs.
Group of GalaxiesUrsa Major N Group
Other IDsUGC 6733, CGCG 268-79
MCG +9-19-174, PGC 36660
Abell 1377 / Galaxy cluster, type 1 3 III
R.A.11h 47m 06.3s (2000.0)
Dec.+55°44' 09" (2000.0)
Apparent Size20.2'
# of Galaxies59
Red Shift0.058
Magnitude15.0
Distance787 million light yrs.
Supergalactic clusterUrsa Major supercluster



NGC3877
NGC3938

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