A Swallowtail in Cygnus: The Butterfly Nebula in SHO (Rob Foster)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 37 Cyg) · 37 gam Cyg · B347 · LBN 234 · LBN 245 · LBN 249 · LBN 253 · LBN 257 · LBN 258 · LDN 889 · NGC 6910 · PK078+00.1 · PK079+00.1 · Sadr · Sh2-108 · The star Sadr (γ Cyg

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A Swallowtail in Cygnus: The Butterfly Nebula in SHO

Revision title: A little less green, a little more contrast

Powered byPixInsight

A Swallowtail in Cygnus: The Butterfly Nebula in SHO

Revision title: A little less green, a little more contrast

The SHO palette evokes the colors of a Swallowtail butterfly, and in this orientation, the bright star Sadr, or Gamma Cygni (γ Cyg), poses as a stand in flower head. Sadr itself is the second brightest star in Cygnus after Deneb, and it is easy to recognize with the naked eye as a magnitude 2.2 star that forms the central crossing point of the Northern Cross asterism. Though they are in the same line of sight, Sadr is much closer at approximately 1,800 ly from Earth, whereas the Butterfly Nebula itself is approximately 4,000 ly away. Aside from a powerful emission nebula of ionized sulfur, hydrogen, and oxygen, the Butterfly Nebula (IC 1318) also contains striking interspersed dark interstellar dust forming the body of the butterfly.

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Title: A little less green, a little more contrast

Description: As is so often the case, the image looks different on a large iMac screen and then online once uploaded - in this case, the original image had a greenish tinge and appeared more washed out than I would have liked, so this was adjusted to address those features.

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Status	Advanced success
Started	...
Astrometry.net job	8514825
PixInsight job	HUIJE76JFSI67FCX6U4IV8T97HJ8YZU3
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h26m27s.97
RA (top/left)	20h18m58s.80
RA (top/right)	20h30m17s.40
RA (bottom/right)	20h34m02s.90
RA (bottom/left)	20h22m30s.35

Dec (center)	+40°04′51″.8
Dec (top/left)	+39°51′23″.3
Dec (top/right)	+38°49′37″.6
Dec (bottom/right)	+40°16′28″.9
Dec (bottom/left)	+41°19′37″.7

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A Swallowtail in Cygnus: The Butterfly Nebula in SHO

Revision title: A little less green, a little more contrast

A Swallowtail in Cygnus: The Butterfly Nebula in SHO

Revision title: A little less green, a little more contrast

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A Swallowtail in Cygnus: The Butterfly Nebula in SHO

Revision title: A little less green, a little more contrast

A Swallowtail in Cygnus: The Butterfly Nebula in SHO

Revision title: A little less green, a little more contrast

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