M13 and its propeller shadow (crobin)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: HD150679 · HD150998 · Hercules Globular Cluster · IC 4617 · M 13 · NGC 6205

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M13 and its propeller shadow

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M13 and its propeller shadow

Located in the constellation Hercules, the Globular Cluster M13, also known as the Great Hercules Cluster, has fascinated astronomers for centuries. One of its most intriguing features is the elusive "propeller shadow »where stars at the cluster's edges appear as a spinning propeller blade. This phenomenon presents a significant challenge for observation and study due to the cluster's immense distance—approximately 25,000 light-years away—and its dense core, which makes resolving individual stars difficult even with advanced telescopes.

Recently, breakthroughs in astrophotography techniques have enabled astronomers to capture stunning images of M13, revealing intricate details within its densely packed core. Utilizing long exposure times and sophisticated image processing algorithms.

Interestingly, efforts to communicate with potential extraterrestrial civilizations have included M13 as a target. In 1974, the Arecibo Observatory transmitted a binary-coded message towards M13, albeit it will take tens of thousands of years for any potential response to reach us due to the vast distances involved.

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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	10024082
PixInsight job	0AYJONOVPWLX76VCS1EZS91NVHNYDYWN
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h42m28s.96
RA (top/left)	16h39m54s.47
RA (top/right)	16h45m04s.21
RA (bottom/right)	16h45m02s.40
RA (bottom/left)	16h39m55s.13

Dec (center)	+36°24′37″.9
Dec (top/left)	+36°45′20″.2
Dec (top/right)	+36°45′04″.3
Dec (bottom/right)	+36°03′43″.6
Dec (bottom/left)	+36°03′58″.3

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M13 and its propeller shadow

M13 and its propeller shadow

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M13 and its propeller shadow

M13 and its propeller shadow

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