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)|
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.
|NGC1807 / Open Cluster, type II 2 p|
|R.A.||05h 10m 42.0s (2000.0)|
|Dec.||+16° 32' 00" (2000.0)|
|# of Stars||20|
|NGC1817 / Open Cluster, type IV 2 r|
|R.A.||05h 12m 5.9s (2000.0)|
|Dec.||+16° 42' 00" (2000.0)|
|# of Stars||60|
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.