Ptolemaeus (MAILLARD)

Contains: Solar system body or event

Ptolemaeus

Acquisition type: Lucky imaging

Ptolemaeus

Acquisition type: Lucky imaging

This is a panorama obtained from two panels.

Very interesting central lunar region, in the last quarter, which contains vast walled plains.

At the bottom left of the image, Ptolemaeus is a large closed plain with a polygonal enclosure, very eroded, with a diameter of 153 km and a depth of 2400 m. Its soil is riddled with small craters and alveoli that are visible here thanks to the vicinity of the terminator.

On the right of Ptolemaeus, Alphonsus is a circus (118 km/2730 m) with a central mountain and a system of grooves. It was in this arena that the Ranger 9 spacecraft crashed on March 24, 1965, after taking images during its descent.

The next crater is Arzachel (97 km/3600 m), with terraced slopes and whose arena is traversed by a groove about 50 km long.

At the top left, immersed in darkness, the Albategnius circus (136 km) strangely reveals only the summits of central mountains lit by the sun.

At the bottom right of the image is the famous fault Rupes Recta 110 km long and about 2.5 km wide, which appears as a thin clear line at sunset.

A little further down after the bright Birt crater, another shallow groove can be observed.

If you observe carefully the shadows cast by the central peaks, inside most craters or circuses, you can judge their general shape, but also guess their imposing sizes.

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

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