Deep Sky Object in Winter
NGC2420 (Open Cluster in Gemini)


Date & Time: Dec 20 2014, from 27:37 to 27:52 JST(+0900)
Composed 5 shots with 4 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial & SBIG STV
Digital Camera: Nikon D700
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(2784×1848)
Device Size...DX Format (24mm×16mm)
Sensitivity...ISO1600, White Balance...Daylight




NGC2420 / Open Cluster, type I 1 r
R.A.07h 38m 30.0s (2000.0)
Dec.+21° 34' 00" (2000.0)
Apparent Size10.0'
Real SizeN/A
# of Stars100
Magnitude8.3
DistanceN/A
NGC2420 is a compact open cluster lying at 4 degrees east of delta Geminorum that forms the body of younger brother of the twins, Pollux. The cluster has 10-arc minutes diameter and 8th magnitude, contains about 100 fine member stars. The stellar density of NGC2420 is fairly high, it looks like a dimmed nebula with binoculars. And you can enjoy several bright stars scattered in front of the nebulous faint light of other stars through telescopes with an aperture of about 3 to 4 inches or so. It is certain that the cluster compares unfavorably with a major open cluster of M35 in Gemini, but it may give you great interest to compare these clusters in winter skies.




NGC2362

NGC2451,NGC2477


Copyright(c) 2015 by Naoyuki Kurita, All rights reserved.
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