Sh2-157 Lobster Claw Nebula HOS with RGB Stars (drblevy13)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD218997 · HD219286 · HD219287 · HD219460 · HD219854 · HD240233 · HD240244 · HD240245 · HD240248 · HD240250 · HD240252 · HD240253 · HD240255 · HD240256 · LBN 533 · LBN 536 · LBN 537 · LBN 540 · LBN 544 · PK110-01.1 · Sh2-157

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Sh2-157 Lobster Claw Nebula HOS with RGB Stars

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Sh2-157 Lobster Claw Nebula HOS with RGB Stars

I wanted to image the Lobster Claw Nebula in Ha, OIII and SII, but felt like varying the palette a bit to keep the hydrogen closer to how it would appear to our eyes (red) while also keeping the subtle effects of the other gases. To achieve this, I assigned Ha to red, OIII to green, and SII to blue. This is also my first attempt at combining RGB star data with a narrowband nebula shot.

This is my second major outing with the Askar 107PHQ. Field flatness was around 10%, and correcting tilt at f/7 has been very straightforward. Since this object was also close to the pole and I worked on fine-tuning PhD2, my AVX delivered consistent 0.6" RMS tracking for this project. I've been very happy with this combination of the scope and AVX so far: they really appear to be punching above their weight class!

Hope you enjoy!

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Status	Advanced success
Started	...
Astrometry.net job	6039241
PixInsight job	Q6S7U4QT0L2XTS43US488C3A8LV1Q4PP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h15m34s.77
RA (top/left)	23h19m19s.30
RA (top/right)	23h20m10s.86
RA (bottom/right)	23h11m37s.34
RA (bottom/left)	23h11m12s.13

Dec (center)	+60°01′58″.8
Dec (top/left)	+59°08′14″.4
Dec (top/right)	+60°52′21″.0
Dec (bottom/right)	+60°55′17″.5
Dec (bottom/left)	+59°10′59″.0

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Sh2-157 Lobster Claw Nebula HOS with RGB Stars

Sh2-157 Lobster Claw Nebula HOS with RGB Stars

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Sh2-157 Lobster Claw Nebula HOS with RGB Stars

Sh2-157 Lobster Claw Nebula HOS with RGB Stars

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