Deep Sky Object in Winter
NGC1647 & NGC1746 (Open Clusters in Taurus)


Date & Time: NGC1647: Dec 20 2014, from 22:57 to 23:19 JST(+0900), 5min.×4shots
NGC1746: Dec 20 2014, from 23:37 to 23:52 JST(+0900), 5min.×4shots
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




NGC1647 / Open Cluster, type c, II 2 r
R.A.04h 46m 0.0s (2000.0)
Dec.+19° 04' 00" (2000.0)
Apparent Size45'
Real Size47 light yrs.
# of Stars200
Magnitude6.4
Distance3600 light yrs.
NGC1746 / Open Cluster, type III 2 p
R.A.05h 03m 35.9s (2000.0)
Dec.+23° 49' 00" (2000.0)
Apparent Size42'
Real SizeN/A
# of Stars20
Magnitude6.0
DistanceN/A
Two medium-sized open clusters lie between the horns of Taurus. NGC1647 is positioned about 5 degrees east of the Hyades. The cluster and the Hyades can be appreciated in the same view frame of binoculars. It's very easy to resolve individual stars in low magnification, you may get the impression that several fine stars are distributed sparse.
One more cluster of NGC1746 can be found 5 degrees north east of NGC1647. The cluster looks spacer than NGC1647. Many of members are sufficiently bright, you can enjoy the full of stars blinking in the field of binoculars.




M93

NGC1807 & NGC1817


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