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Dan Lessmann

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M13, The Great Hercules Globular Cluster


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Arguably, although not by me, this globular cluster in Hercules is the most outstanding visible from the northern hemisphere.  This cluster has an estimated 1 million member stars and is believed to be about 21,000 light years distant.  If you're blessed with good vision and very dark skies, this cluster may be visible to the naked eye between the two western stars of the Hercules keystone and is an astonishing view through a telescope, most especially from dark sky.


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Date:  5/12/2007

Location:  CRO

Telescope:  LX200 10" SCT, f/10

Mount:  AP-1200

Camera:  Hutech modified Canon 350D, ISO 800

Exposure Count:  16 @ 3 minutes, 48 minutes total exposure.

Guiding:  CCD Soft with ST402ME, Orion 80ED

Post Processing:

ImagesPlus:  Dark and flat calibration, align and combine, digital development

Photoshop CS2:  Smart sharpen, levels, curves

NeatImage:  Noise reduction


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Last Updated: 11/12/2014  -  Copyright 2004-2013 by Dan Lessmann.  All rights reserved.  Please click here for my usage policy.