Deep Sky Object in Spring
M67(Open Cluster in Cancer)

Date & Time: Apr 26 2003, from 20:55 to 21:07 JST(+0900)
Composed 3 shots with 5 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsolon (f=530mm, F3.3)
Auto-guided with TAKAHASHI JP equatorial
Digital Camera: Fujifilm FinePix S2 Pro
Location: Ooizumi vil., Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO800, White Balance...Auto

M67 (NGC2682) / Open Cluster, type f, II 3 r
R.A.08h 50m 24.0s (2000.0)
Dec.+11° 49' 00" (2000.0)
Apparent Size15.0'
Real Size12 light yrs.
# of Stars200
Distance2700 light yrs.
M67 (NGC2682) is an open cluster about 9 degrees south-east of the Praesepe (M44), with a diameter of 15 arc minutes. The cluster is positioned just 2 degrees west of alpha Canicri, so it should be easy to find the figure like a nebula with binoculars. You can appreciate the individual stars with a telescope over 6cm (2.4"), plenty of faint stars with magnitude about 11 to 13 are scattered like gold dust, and detectable that the whole of shape is like a hemisphere.
M67 consists of about 200 stars, and they're over ten billion years old. Distance from the solar system is estimated about 2700 light years.



Copyright(c) 2003 by Naoyuki Kurita, All rights reserved.
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