Sh2-135, the Inkspot Nebula (Roger Nichol)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: 22 lam Cep · LBN 485 · LBN 486 · LBN 489 · LBN 490 · LBN 491 · LBN 492 · LBN 493 · NGC 7261 · PK104+00.1 · Sh2-134 · Sh2-135 · The star λCep

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Sh2-135, the Inkspot Nebula

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Sh2-135, the Inkspot Nebula

A less frequently imaged nebula, mostly hydrogen with a bit of Oiii mixed in. There is a blue shock wave in the upper left near that large star, Lambda Cephei. This star is moving at high speed, probably due to ejection from its location by a supernova. It emits intense UV light that compresses a wall of interstellar gases in front of it.

I wanted more time on this one, but I'm getting only 2 images per night now before it goes behind a tree (must get a chain saw!). Will have another go next year and see if it's got any sulphur.

I used the relatively new Generalised Hyperbolic Stretch script in PI for the first time on this one. I think it did a better job than a normal HT, particularly on my L-Pro stars.

A new filter was used for a couple of the images - the Antlia ALP-T dual 5nm narrowband. It certainly fixes the halos I get in Oiii from the L-eXtreme. When processing along with the L-eXtreme images though, the ALP-T images get a lower weighting in the NSG script as there are fewer stars than visible in the L-eXtreme - not a problem once I finish off the various images I have in progress though.

Optolong L-eXtreme filter
Sharpless2 Objects
ZWO ASI 2600MC PRO

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Status	Advanced success
Started	...
Astrometry.net job	5493712
PixInsight job	62L81RT71KDS3TK267XJK8NZFBW60FTE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h18m49s.829
RA (top/left)	22h09m08s.900
RA (top/right)	22h17m08s.609
RA (bottom/right)	22h28m07s.639
RA (bottom/left)	22h20m40s.536

Dec (center)	+58°55′04″.100
Dec (top/left)	+59°39′19″.35
Dec (top/right)	+57°29′37″.17
Dec (bottom/right)	+58°08′20″.91
Dec (bottom/left)	+60°20′26″.58

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Sh2-135, the Inkspot Nebula

Sh2-135, the Inkspot Nebula

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Sh2-135, the Inkspot Nebula

Sh2-135, the Inkspot Nebula

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