NGC 6857 - Sh2-100 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: NGC 6857 · PK070+01.1 · PK070+01.2 · Sh2-100

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NGC 6857 - Sh2-100

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NGC 6857 - Sh2-100

This is a small, rarely imaged HII region located 30,000 light years away in the constellation of Cygnus at a declination of +34 degrees. The bright area in the center of the image is about 1 arc-minute in diameter, which corresponds to a diameter of 9 light years.

This bright area is classified as both NGC 6857 and PK 70+1.2. As you might guess from the classification, this area was originally thought to be a planetary nebula. It is now believed that this is an HII region, as is the surrounding dimmer HII region, Sh2-100. In my opinion, the detail of this image shows that this bright area is unlikely to be a PN, since the structure is unlike any PN that I have seen. Also, its size of 9 light years is too large for a bright PN.

There is a planetary nebula in this image, but it is not NGC 6857. Just 1 arc-minute below NGC 6857 is a tiny circular bright red area which is planetary nebula K 3-50.

Towards the bottom left of the image is an interesting half circular area of HII. I found conflicting information on the designation of this object.

The refractors!
Cloudy Nights
Takahashi Refractors
Sharpless2 Objects
ZWO ASI183/QHY183
Unique or Unusal Deep Sky Targets

Griffiths PN Catalog (Complete)
HII-Dominated Nebulae
PN Imposters
Sharpless Catalog (200/313)
Small Packages Catalog (Complete)

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Status	Advanced success
Started	...
Astrometry.net job	3048262
PixInsight job	TUKQCPGR3C7XPYXMF0QGW5H3OELXY7D1
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h01m47s.987
RA (top/left)	20h01m06s.678
RA (top/right)	20h02m32s.793
RA (bottom/right)	20h02m29s.355
RA (bottom/left)	20h01m02s.990

Dec (center)	+33°31′29″.61
Dec (top/left)	+33°24′55″.48
Dec (top/right)	+33°26′02″.74
Dec (bottom/right)	+33°38′03″.55
Dec (bottom/left)	+33°36′56″.37

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NGC 6857 - Sh2-100

NGC 6857 - Sh2-100

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NGC 6857 - Sh2-100

NGC 6857 - Sh2-100

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