Deep Sky Object in Summer
M19 (Globular Cluster in Ophiuchus)

Date & Time: May 20 2005, from 25:41 to 25:55 JST(+0900)
Composed 4 shots with 4 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D70 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 8bit TIFF(3008×2000)
CCD Sensitivity...ISO800

M19 (NGC6273) / Globular Cluster, type VIII
R.A.17h 02m 36.0s (2000.0)
Dec.-26° 16' 00" (2000.0)
Apparent Size4.3'
Real Size65 light yrs.
Distance22,000 light yrs.
This image shows you a small globular cluster of M19 lying around boundary between Ophiuchus and Scorpius. Although M19 belongs to a constellation of Ophiuchus, you can find out the cluster by tracing about 7.5 degrees east from Antares, alpha Scorpii. The cluster has very low density of member stars; only compact binocular can show you a nebula like image with a bit coarse impression, and you can recognize individual stars on outskirts only with small telescopes.
Almost all of globular clusters have round shapes, some of those look like ellipse. This M19 has very long and narrow oval shape, you can see the cluster stretched in north south direction clearly.



Copyright(c) 2005 by Naoyuki Kurita, All rights reserved.
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