Deep Sky Object in Summer
M55 (Globular Cluster in Sagittarius)

Date & Time: May 11 2007, from 26:36 to 26:50 JST(+0900)
Composed 4 shots with 4 minutes exposed
Optical: TAKAHASHI 12.5cm(4.9") fluorite refractor (f=1000mm, F8.0)
Auto-guided with VIXEN ATLUX Equatorial & Meade Pictor 201XT
Digital Camera: Fujifilm FinePix S2 Pro
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO1600, White Balance...Auto

M55 (NGC6809) / Globular Cluster, type XI
R.A.19h 40m 0.0s (2000.0)
Dec.-30° 58' 00" (2000.0)
Apparent Size10.0'
Real Size81 light yrs.
Distance19,000 light yrs.
M55 (NGC6809) is a sparse globular cluster a bit far to east from the Milky Way in Sagittarius. The cluster can be found by stretching a line from sigma to tau Sgr., has a magnitude of about 7.6, you can see it with binoculars.
You can see this picture that the individual stars in M55 are almost perfectly resolved; actually the cluster is less concentrated than almost all of other globular clusters.

M54, M69, M70


Copyright(c) 2007 by Naoyuki Kurita, All rights reserved.
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