Catching Light

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Dan Lessmann

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M21

 

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M21, is an open cluster in Sagittarius with about 55 member stars.  At magnitude 5.9 M21 is an easy find with binoculars or a finder scope but is well camouflaged among all of the open clusters in the "steam" from the "teapot".  It's just a short hop of less than a degree from the Trifid Nebula, M20 to the southwest.  M21 is about 5,200 light years distant and is estimated to be about 20 light years in diameter.

 

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Date:  7/14/2007

Location:  CRO

Telescope:  LX200 10" SCT, f/6.3

Mount:  AP-1200

Camera:  Hutech modified Canon 350D, ISO 800

Exposure Count:  17 @ 5 minutes, 1 hours, 25 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

Neat Image:  Noise reduction

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