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 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.
|NGC2420 / Open Cluster, type I 1 r|
|R.A.||07h 38m 30.0s (2000.0)|
|Dec.||+21° 34' 00" (2000.0)|
|# of Stars||100|