Deep Sky Object in Summer
M71 (Globular Cluster in Sagitta)

Date & Time: May 4 2013, from 24:49 to 25:29 JST(+0900)
Composed 6 shots with 8 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Canon EOS 600D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)

M71 (NGC6838) / Globular Cluster
R.A.19h 53m 48.0s (2000.0)
Dec.+18° 47' 00" (2000.0)
Apparent Size6.1'
Real Size32 light yrs.
Distance18,000 light yrs.
M71 is found between delta and gamma Sagittae and slightly south. This celestial body is classified as a globular cluster with a size of 6 arc minutes, but it looks more like a crowded open cluster. You can detect the individual stars with only small scopes.
The cluster has a magnitude of about 9 and 18 thousand light years away. It's fairly easy to find that with binoculars in the clear asterism of the Arrow.



Copyright(c) 2013 by Naoyuki Kurita, All rights reserved.
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