The Ptolemy's Cluster (Messier 7) (Leo Pires)

Celestial hemisphere: Southern · Constellation: Capricornus (Cap)

The Ptolemy's Cluster (Messier 7), Leo Pires

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The Ptolemy's Cluster (Messier 7)

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The Ptolemy's Cluster (Messier 7)

=_aacl _aaco _aacu _aacx _aad7 _aadeThis is a bright open cluster in Scorpius constellation. The cluster lies at an approximate distance of 980 light years from Earth and it's an easy naked-eye target.

M7 is one of the most prominent open clusters in the sky, known since antiquity. It was named Ptolemy’s Cluster because it was first recorded by the Greek astronomer and mathematician Claudius Ptolemy in the 2nd century. Ptolemy listed the cluster in his Almagest as Object Number 567 and described it as a “nebula following the sting of Scorpius” in 130 AD.

Italian astronomer Giovanni Batista Hodierna counted 30 stars in the cluster before 1654. In 1678, English astronomer Edmond Halley included the cluster in his catalogue of southern stars as No. 29.

French astronomer Nicolas Louis de Lacaille observed the cluster on June 15, 1752 and listed it as Lac. II.14 in his catalogue of southern objects. He described the cluster as a “group of 15 or 20 stars very close together, in the figure of a square.”

Charles Messier included the cluster as the seventh entry in his catalogue on May 23, 1764. He described it as a “star cluster, more considerable than the preceding [Messier 6]; to the naked eye, this cluster looks like a nebulosity; it is little distant from the preceding, placed between the bow of Sagittarius & the tail of Scorpius.”

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Sky-Watcher Explorer 150 PL (F8)
Celestron CG-5 Advanced GT Mount
Canon T1i Mod
6x300sec (30min total)
Guider: SvBony 60mm F4 + ZWO ASI120-MC
NINA + PixInsight + Photoshop
Piquete-SP / Brazil
Bortle 3/4

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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
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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
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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
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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	8126219
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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The Ptolemy's Cluster (Messier 7)

The Ptolemy's Cluster (Messier 7)

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The Ptolemy's Cluster (Messier 7)

The Ptolemy's Cluster (Messier 7)

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