Deep Sky Object in Winter
M36, M37, M38 (Open Clusters in Auriga)


Date & Time: M36: Dec 14 2014, 21:05 to 21:17 JST(+0900), 2min.×6shots
M37: Dec 14 2014, 21:24 to 21:35 JST(+0900), 2min.×6shots
M38: Dec 14 2014, 21:40 to 21:50 JST(+0900), 2min.×6shots
Optical: VIXEN 20cm(7.9") VISAC with a conversion lens (f=1278mm, F6.4)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS 600D (Remodeled)
Location: Hiraiso, Hitachi-naka city, Ibaraki pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO3200




At about the zenith in winter sky, a trio of open clusters is bathed in the faint Milky Way of Auriga. They are paralleled M37 (NGC2099), M36 (NGC1960), and M38 (NGC1912) from east to west. M38 has a bit sparser star-density than other two, only M38 is classified in type f, M36 and M37 have a type of e.
Both appearances and real scales of all three are very alike. A telescope is preferred but you can at least locate these objects with binoculars. It'll be very interesting to compare their distributions of stars and/or detailed structures with telescopes. They have sizes of about 20 arc minutes and distances of 3500 to 4700 light years approximately.
Wide-field image around M36,M37,M38
Wide-field image around M36,M37,M38

M36 (NGC1960) / Open Cluster, type f, I 3 r
R.A.05h 36m 6.0s (2000.0)
Dec.+34° 08' 00" (2000.0)
Apparent Size12'
Real Size13 light yrs.
# of Stars60
Magnitude6.3
Distance3780 light yrs.
M37 (NGC2099) / Open Cluster, type f, I 2 r
R.A.05h 52m 24.0s (2000.0)
Dec.+32° 32' 59" (2000.0)
Apparent Size20'
Real Size27 light yrs.
# of Stars150
Magnitude6.2
Distance4720 light yrs.
M38 (NGC1912) / Open Cluster, type e, type II 2 r
R.A.05h 28m 42.0s (2000.0)
Dec.+35° 50' 00" (2000.0)
Apparent Size20'
Real Size21 light yrs.
# of Stars100
Magnitude7.4
Distance3580 light yrs.




M35

M41


Copyright(c) 2014 by Naoyuki Kurita, All rights reserved.
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