M013 (John R Carter, Sr.)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · IC 4613 · IC 4614 · IC 4615 · IC 4616 · IC 4617 · M 13 · NGC 6194 · NGC 6197 · NGC 6205 · NGC 6207

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M013

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M013

(Description from SkySafari 6 Pro)

Messier 13, also designated NGC 6205, and sometimes called the Great Hercules Cluster, is considered the most spectacular globular cluster in northern skies.

The Great Hercules Cluster was discovered by Edmond Halley in 1714, who noted that "it shows itself to the naked eye when the sky is serene and the Moon absent." Fifty years later it was examined by Charles Messier, who cataloged it in 1764. M 13 is also reported in John Bevis' Celestial Atlas. In 1787, Sir William Herschel pronounced it "a most beautiful cluster of stars, exceedingly compressed in the middle, and very rich."

At magnitude 5.8, M 13 is barely visible to the naked eye on very dark nights. It appears about 1/3 of the distance from Eta to Zeta Herculis, the two western (leading) stars in the Keystone asterism of Hercules. Even small telescopes resolve it into an extensive, magnificent mass of stars, perhaps 13' across visually. Observers note four apparently star-poor regions. The faint, 11th-magnitude galaxy NGC 6207 lies nearby, about 28' to the north east, and is visible in many wide-field photographs of M 13.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	3665828
PixInsight job	L4BVE0B992IKTA54F1QZMFKURULLJ9OV
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h40m59s.99
RA (top/left)	16h44m43s.17
RA (top/right)	16h46m44s.89
RA (bottom/right)	16h37m25s.89
RA (bottom/left)	16h35m03s.75

Dec (center)	+36°40′59″.3
Dec (top/left)	+38°15′15″.7
Dec (top/right)	+35°23′34″.2
Dec (bottom/right)	+35°06′22″.7
Dec (bottom/left)	+37°57′14″.6

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