Globular cluster M3 (RalfThielenPicart)

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

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Globular cluster M3

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Globular cluster M3

Messier 3 (M3, NGC 5272) is one of the most outstanding globular clusters. It consists of about half a million stars.
At a distance of 33,900 light years, M3 is further from us than the center of our galaxy. Nevertheless, it seems to have a visual brightness of 6.2 mag; its absolute brightness is -8.93 Mag. Its luminosity is 300,000 times that of our sun. Under very favorable visibility conditions, M3 can even be seen in the night sky with the naked eye. Even in small telescopes, M3 is a fascinating object. Its apparent diameter is 18 minutes of arc, so its real linear diameter corresponds to about 180 light years. Other photographic investigations allow a conclusion to be drawn that the diameter is approx. 20 arc minutes or, in real terms, approx. 200 light years. According to the website "SEDS Messier", the gravity of M3 dominates a spherical volume with a diameter of 760 light years. Members of the globular cluster that exceed the limit of this spherical volume are "forced" to leave M3 by the gravitational forces of the Milky Way. M3 is moving towards us at a speed of 147.6 km / s.

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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	Basic success
Started	...
Astrometry.net job	4855675
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Globular cluster M3

Globular cluster M3

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Globular cluster M3

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