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M10 (Globular Cluster, in Ophiuchus)
Observer: Jim Tomney (e-mail: skytour@erols.com, web: http://users.aol.com/JTomney)
Instrument: 6-inch equatorial reflector Location: Marriotsville (Alpha Ridge), MD, USA
Light pollution: light Transparency: good Seeing: good
Time: Wed Jun 4 15:15:00 1997 UT Obs. no.: 156
Amid the semi-dark skies at Alpha Ridge I was surprised at how readily I could scoop up M10 and its neighbor M12 in the 7x50 binoculars. I'd guesstimate the magnitude to be somewhere around8-8.5 for these two. The star hop was a little tedious but not bad, and panning with the 42mm Ultima soon brought M10 into view. It was steady if not powerful, strong enough to take direct vision yet improved by averted vision. The field at 28x was pleasant but had nothing significant. At 75x the view was best, bringing forth a little speckling of resolution on the fringes when averted vision was used. The globular has a rather even distribution of light with gradual and subtle brightening towards the core. The visible size would be somewhere in the neighborhood of 5 arc-minutes.Bumping the magnification up to 124x did little to improve the view although it may have been possible with study to tease a bit more detail from the globular; in general 124x seemed to betoo much magnification for M10 as it became dimmer.
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Questions? Problems? E-mail jbc@west.net
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