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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.
Back to Messier Gallery
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
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Post Processing: |
ImagesPlus: Dark and flat calibration, align and
combine, digital development
Photoshop CS2: Smart sharpen, levels, curves
Neat Image: Noise reduction
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