Sh2-129 and OU4 - The Bat and the Squid (Gary Seven)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD201063 · HD201344 · HD201429 · HD202214 · HD202380 · HD203534 · HD203551 · HD203574 · HD203627 · HD203695 · HD239582 · HD239618 · HD239626 · LBN 441 · LBN 445 · LBN 449 · LBN 453 · Sh2-129

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Sh2-129 and OU4 - The Bat and the Squid

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Sh2-129 and OU4 - The Bat and the Squid

I had heard that this could be a difficult target and said to myself "How hard can it be? Collect data. Process image. Done."

OMG was this a difficult one!

The H-a part is very easy.

The issue (for those unfamiliar) is the Squid, only revealed in the O-III data. The outline of the Squid shows up well. The interior is extremely faint, scarcely above the noise level of the field in general.

My first attempt had a very translucent appearance - more like a Jellyfish than a Squid. Subsequent processing attempts only looked worse. What I am publishing here is the first attempt. So many versions ago I hardly remember what my processing flow was ;-)

After spending an inordinate amount of time with it, I decided the answer was to get more - lots more - O-III data under more transparent Autumn skies and vigorously cull it based on SNR. And hopefully improve my processing techniques and skills.

Cloudy Nights
N.I.N.A. Users
ZWO ASI2600MM Pro
Arizona Astrophotographers
Takahashi FSQ 85 EDX

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Status	Advanced success
Started	...
Astrometry.net job	8039173
PixInsight job	2D2P4YRO37FYC5OB6ETKVB4061TLDEZ7
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h11m43s.606
RA (top/left)	21h23m40s.701
RA (top/right)	20h59m39s.573
RA (bottom/right)	21h00m27s.573
RA (bottom/left)	21h23m06s.455

Dec (center)	+59°56′11″.48
Dec (top/left)	+60°53′25″.38
Dec (top/right)	+60°52′06″.77
Dec (bottom/right)	+58°55′09″.45
Dec (bottom/left)	+58°56′22″.24

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Sh2-129 and OU4 - The Bat and the Squid

Sh2-129 and OU4 - The Bat and the Squid

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Sh2-129 and OU4 - The Bat and the Squid

Sh2-129 and OU4 - The Bat and the Squid

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