Some Northern Nebulae: SH2-157, NGC 7538 and NGC 7635 (Torben van Hees)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 4 Cas · Bubble Nebula · LBN 533 · LBN 536 · LBN 537 · LBN 540 · LBN 542 · LBN 543 · LBN 544 · LBN 547 · LBN 548 · LBN 549 · LDN 1225 · LDN 1229 · LDN 1230 · LDN 1231 · LDN 1237 · LDN 1244 · LDN 1245 · M 52 · NGC 7510 · NGC 7538 · NGC 7635 · NGC 7654 · PK110-01.1 · PK112-00.1 · Sh2-157 · Sh2-158 · Sh2-159 · Sh2-161 · And 2 more.

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Some Northern Nebulae: SH2-157, NGC 7538 and NGC 7635

Link: http://astro.van-hees.name

Powered byPixInsight

Some Northern Nebulae: SH2-157, NGC 7538 and NGC 7635

Link: http://astro.van-hees.name

It is currently unclear if all these nebulae are part of a single, huge molecular cloud in the Pegasus arm of our own galaxy or if there is only a chance clumping of otherwise distinct streams of gas. The most recent studies I found about this are from 2019 and they provide evidence for either interpretation.

This was a rather "quick snap" done with my mobile setup from the backyard. It is now running reliably and I think I'm ready to take it on the trip to Namibia.

The planetary nebula in the annotations is detected, but not resolved. Its angular size seems to be 4".

Only after posting this image I realised that the SNR was far too good and the gradients far too little. Checking the scope, I found that the IDAS NBZ filter was in the slider, instead of the L that I wanted to put there. So I've reprocessed as a HOO false color image in Revision B. I also realize I have to tweak backfocus some more - although I do not expect the 76DCU to provide good stars to the corners.

Original
Final
B

B

Description: as HOO false colour

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TAKAHASHI FC76 SHOOTING
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Status	Advanced success
Started	...
Astrometry.net job	6099420
PixInsight job	NRB08XC1Q9128KTX98925MHS0W0NJDNS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h18m53s.41
RA (top/left)	23h25m13s.47
RA (top/right)	23h01m48s.92
RA (bottom/right)	23h13m17s.25
RA (bottom/left)	23h36m10s.25

Dec (center)	+61°03′00″.3
Dec (top/left)	+62°59′26″.1
Dec (top/right)	+60°53′54″.7
Dec (bottom/right)	+59°05′41″.8
Dec (bottom/left)	+61°03′47″.5

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Some Northern Nebulae: SH2-157, NGC 7538 and NGC 7635

Some Northern Nebulae: SH2-157, NGC 7538 and NGC 7635

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Some Northern Nebulae: SH2-157, NGC 7538 and NGC 7635

Some Northern Nebulae: SH2-157, NGC 7538 and NGC 7635

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