M 3 (Robert.S) - AstroBin

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: M 3 · NGC 5272

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M 3

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M 3

"Messier 3 (also known as NGC 5272) is a globular cluster of some 180 – 220 light-years across, located about 33,900 light-years away from Earth in the northern constellation of Canes Venatici. It is one of the largest, brightest, and best-studied globular clusters. It has a bright, dense core with a diameter of about 11 light-years, comparatively large for a globular cluster, and half of this clusters mass is contained in a volume of only 22 light-years in diameter.

Messier 3 is made up of around 500,000 stars, including 274 known variable stars; by far the highest number found in any globular cluster. It has a total mass of about 450,000 sun masses, and a luminosity of about 300,000 times that of our Sun. It is estimated to be between 8 and 11.4 billion years old.

It also contains a relatively large number of so-called Blue Stragglers, blue main-sequence stars which appear to be rather young. Since all stars in globular clusters are believed to be about the same age, it is possible these stars have had their cooler outer layers stripped away in close encounters, which occasionally occur when stars are passing through the dense core region of the cluster."

Anne's Astronomy News

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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	Basic success
Started	...
Astrometry.net job	4040723
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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