M17 The Nebula of many names (James R Potts)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: Checkmark Nebula · IC 4706 · IC 4707 · LBN 60 · Lobster Nebula · M 17 · NGC 6618 · Sh2-45 · Swan Nebula · omega Nebula

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M17 The Nebula of many names

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M17 The Nebula of many names

I had a few hours of clear but windy skies last night. I captured almost 5 hours, but deleted at least a third because of bad star trails, it was a tough night to guide.

M17 is know by 5 different names, the Omega Nebula, Horseshoe Nebula, Swan Nebula, Checkmark Nebula and the Lobster Nebula. John Herschel's 1833 drawing of M17 resembled the Greek letter Omega which also looks like a Horseshoe. The Checkmark name comes from the center of the nebula (the bright core) that is the shape of a checkmark. Some say if you flip image, you can see the shape of a Lobster, I do not see this. A lastly, the Swan name come from the appearance of a curved head and neck curving around the dark nebula in the center, I can see this.

M17 like is close neighbor M16 is a star forming region around 6,000 to 7,000 light years away. The actual nebula is about 15 light years across, but it is surrounded by a gaseous cloud that extends 40 light years.

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Status	Advanced success
Started	...
Astrometry.net job	7996297
PixInsight job	XFUAGGDVP28FGAFMJX06HPPWJ710YHPK
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h20m46s.479
RA (top/left)	18h20m47s.363
RA (top/right)	18h23m46s.727
RA (bottom/right)	18h20m45s.632
RA (bottom/left)	18h17m45s.563

Dec (center)	-16°10′33″.53
Dec (top/left)	-16°57′52″.24
Dec (top/right)	-15°51′45″.38
Dec (bottom/right)	-15°23′18″.88
Dec (bottom/left)	-16°29′14″.23

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M17 The Nebula of many names

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M17 The Nebula of many names

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