Cr 399 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: 4 Vul · 5 Vul · 7 Vul · IC 1299 · NGC 6802 · PK055+01.1 · Sh2-83 · The star 4Vul · The star 5Vul

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Cr 399

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Cr 399

This object is an asterism located in the constellation of Vulpecula. It is one of the few sky objects for which you could guess its namesake, the Coathanger, with reasonable accuracy.

This object was thought to be an open star cluster until about 50 years ago. Since then, several studies have shown that this object is simply a chance alignment of stars.

The object is known by many other names and designations. It was first described by the Persian astronomer Al Sufi in his Book of Fixed Stars in 964, and therefore is sometimes called Al Sufi's cluster. Some people refer to it as Brocchi's Cluster, after the 1920s astronomer Dalmero Francis Brocchi. And finally, it is the 399th entry in the 1931 catalog of open clusters by Swedish astronomer Per Collinder, and therefore is known as Cr 399.

Three deep sky objects are also located in this same image. NGC 6802 is the open star cluster on the right side of the image. IC 1299 is a faint open cluster towards the lower left corner of the image, and Sh2-83 is a tiny reddish nebula just to the right of IC 1299.

My favorite part of this image is the alignment of star colors for this object. Bright blue stars dominate the bottom row. The brightest star in the image is white star 4 Vulpeculae at the top, and just to the right is a brilliant orange star.

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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.

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.
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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	Advanced success
Started	...
Astrometry.net job	2263861
PixInsight job	CLFIJAKM52GEMSH01KNTICQU1TY7ZFTG
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h26m13s.94
RA (top/left)	19h20m28s.42
RA (top/right)	19h31m50s.80
RA (bottom/right)	19h32m04s.39
RA (bottom/left)	19h20m33s.35

Dec (center)	+20°06′05″.9
Dec (top/left)	+19°07′30″.9
Dec (top/right)	+19°04′29″.9
Dec (bottom/right)	+21°03′53″.4
Dec (bottom/left)	+21°06′49″.5

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