M10 - Globular Cluster
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- RA: 16:57.1
- Dec: -04:06
- Magnitude: 6.6
- Distance: 14,300 ly
- Size: 15.1 arc min
- Constellation: Ophiuchus
- Scope: 8" SCT at f/10
- Autoguider: ST-4 in faint mode
- Sky conditions: quite good transparency and seeing
- Film: Kodak Supra 400
- Exposure: 30 minutes
- Date: July 1, 2003
Comments: A pleasantly warm night with quite good conditions. It was a pleasure after all the cold nights this spring.
The linear diameter of M10 is about 63 light years, however the bright core is only a little more than half that size. It is receding from us 69 km/sec. The central region, according to Mallas, appears to be pear-shaped with a grainy texture.