M7 Ptolemy's Cluster in Scorpius (glend)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: M 7 · NGC 6444 · NGC 6453 · NGC 6475

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M7 Ptolemy's Cluster in Scorpius

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M7 Ptolemy's Cluster in Scorpius

Ptolemy's Cluster, aka M7, is an open cluster of stars in the constellation of Scorpius. This Cluster contains about 80 stars within a field of view of 1.3° across (note that the field radius in this image is 1.8 degrees). At the cluster's estimated distance of 980 light years this corresponds to an actual diameter of 25 light years. In this image the bckground starfield dust lanes show up nicely.

This image was captured with a Nikon D5300 camera on a TS 71 SDQ Quad APO at f6,3 (fl 450mm). Note that the TS71SDQ supports larger format cameras with a 44mm imaging circle. Mount is the CGX.

This image consists of: 66 x 60 second subs. Shot at ISO400. Processed in DSS and Photoshop CC with Darks and Bias frames.

Note that I also have a previous image of M7 in my Gallery, taken with a TS80 APO reduced to f5,53 (fl 442mm) through an ASI1600MM-C, if you wish to compare the two. The image shown here (TS71 SDQ) provides a larger field radius.

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.

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M7 Ptolemy's Cluster in Scorpius

M7 Ptolemy's Cluster in Scorpius

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M7 Ptolemy's Cluster in Scorpius

M7 Ptolemy's Cluster in Scorpius

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