M7 Ptolemy Cluster (Patrick Dufour)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: M 7 · NGC 6453 · NGC 6455 · NGC 6475 · Ptolemy's Cluster

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M7 Ptolemy Cluster

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M7 Ptolemy Cluster

Messier 7 is a small cluster of about 100 stars located in the constellation of Scorpius, about 800 light-years away.

The first to mention this stellar object was the Roman mathematician and astronomer Claudius Ptolemy, as early as 130 AD, who described it as a “nebula following the sting of Scorpius.” In his honor, Messier 7 is sometimes called Ptolemy’s Cluster.

Open star clusters like Messier 7 are groups of stars born at almost the same time and place, from large cosmic clouds of gas and dust in their host galaxy. These groups of stars are of great interest to scientists, because the stars in them have about the same age and chemical composition. This makes them invaluable for studying stellar structure and evolution.

An interesting feature in this image of Messier 7 is that, although densely populated with stars, the background is not uniform and is noticeably streaked with dust. This is most likely to be just a chance alignment of the cluster and the dust clouds.

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	Distinct awarded users	Total awarded images
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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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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.
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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	3662227
PixInsight job	n/a
PixInsight queue size	n/a
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M7 Ptolemy Cluster

M7 Ptolemy Cluster

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M7 Ptolemy Cluster

M7 Ptolemy Cluster

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