Deep Sky Object in Winter
NGC1807 & NGC1817 (Open Clusters in Taurus)

Date & Time: Oct 18 2014, from 25:52 to 26:21 JST(+0900)
Composed 4 shots with 8 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with Astronomik CLS-CCD filter
Auto-guided with TAKAHASHI JP Equatorial & SBIG STV
Digital Camera: Canon EOS 550D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(5184×3456)

NGC1807 / Open Cluster, type II 2 p
R.A.05h 10m 42.0s (2000.0)
Dec.+16° 32' 00" (2000.0)
Apparent Size17'
Real SizeN/A
# of Stars20
NGC1817 / Open Cluster, type IV 2 r
R.A.05h 12m 5.9s (2000.0)
Dec.+16° 42' 00" (2000.0)
Apparent Size16'
Real SizeN/A
# of Stars60
Around between Taurus and Orion, you can see two small open clusters lined up with an interval of 20 arc minutes. This couple is positioned at a bit south of the midway of Taurus's southern horn. The cluster at the right-hand side (west) is NGC1807, and another one at the left side (east) is called NGC1817.
Both clusters have apparent diameters of 16 arc minutes; they should be classified in small-sized group. But it'll be sufficiently worth seeing with binoculars that two pretty clusters are snuggled up just above the head of Orion.

NGC1647 & NGC1746


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