M13, Awesome Seeing (Bill Dirks)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · M 13 · NGC 6205

M13, Awesome Seeing

Known as the Great Globular Cluster in Hercules. Brightest globular cluster in the Northern hemisphere. A popular target for amateur astronomers, this object is easily visible in binoculars or a small telescope. Estimated to contain about 300,000 to 500,000 stars.

This was kind of a bonus image, captured over a few nights in short sessions in the hours just before dawn, after long sessions on galaxies. At this time M13 was directly overhead at the end of the night, the best opportunity for getting a sharp image.

Captured with a monochrome camera and L,R,G,B filters.

The steadiest air was April 11th, captured 8 very sharp L exposures. (Wow. Threw out all earlier exposures.) April 16th was again very good and got R,G,B exposures. (Really excited now.) Unfortunately two of the L exposures had satellite trails that didn't get fully removed in processing. But the 18th was again very good, took 12 more L exposures. Final L plane uses the 6 good L exposures from the 11th, plus the 4 best from the 18th, then combined with the (even sharper) green plane weighted 85% L + 15% G. (Final L plane FWHM 1.85".) All R,G,B exposures were used for color.

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced failed
Started	...
Astrometry.net job	9698161
PixInsight job	59XZ6TLEUCLMUSBQE13DFMN72LSN5N0X
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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M13, Awesome Seeing

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