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
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.



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