NGC 6357 - 2020 (Gary Imm)

NGC 6357 - 2020

This object, also known as Sh2-11 and the Lobster Nebula, is a bright emission nebula located 5000 light years away in the southern sky constellation of Scorpius at a declination of -34 degrees.

A number of open star clusters are present in the image, the most prominent being Pismis 24. The Pismis 24 cluster is seen just above the bright emission window at the center of the nebula. The other open clusters are clouded by dust and are much more easily seen in X-ray images of this object.

Dr. Paris Pismis was an Armenian-Mexican female astronomer. Among many other accomplishments, she compiled the Pismis catalogue of 22 open clusters and 2 globular clusters in the southern hemisphere. She was the first professional astronomer in Mexico and has been recognized as the most influential person in establishing Mexico’s importance in astronomy research.

This narrowband image is dominated by Ha signal, as in most narrowband images, but this object also contains a relatively large amount of SII signal compared to most other emission nebula. This Ha-SII dominance leads to the orangish tint when using the Hubble SHO color pallet. I like the regions of blue OIII signal throughout the image and especially the wisp towards the upper right of the nebula.

The Lobster nickname makes sense to me - I can sort of see a lobster in there. This nebula also has the alternative nickname of the War and Peace Nebula, because in the infrared the bright central area resembles a dove and the area above it resembles a skull. I had a tough time seeing dove and skull images clearly in the internet infrared images I examined of this object. It is interesting to me that this War and Peace nickname has become so popular when it is so difficult to see in the shape of the nebula.

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Wolf-Rayet Nebulae

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Status	Advanced success
Started	...
Astrometry.net job	3837428
PixInsight job	EO7R1DGXQZ3B8WEA1BHJTK5OU8EKHCNJ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	17h25m16s.740
RA (top/left)	17h20m48s.846
RA (top/right)	17h30m17s.543
RA (bottom/right)	17h29m39s.963
RA (bottom/left)	17h20m20s.174

Dec (center)	-34°15′45″.57
Dec (top/left)	-34°59′41″.72
Dec (top/right)	-34°49′11″.40
Dec (bottom/right)	-33°31′12″.54
Dec (bottom/left)	-33°41′34″.49

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NGC 6357 - 2020

NGC 6357 - 2020

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NGC 6357 - 2020

NGC 6357 - 2020

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