Sh2-157 Lobster Claw Nebula (Molly Wakeling)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 2 Cas · HD218997 · HD219286 · HD219287 · HD219460 · HD219854 · HD220016 · HD220102 · HD220167 · HD220369 · HD240244 · HD240245 · HD240248 · HD240250 · HD240252 · HD240253 · HD240256 · HD240264 · HD240267 · LBN 533 · LBN 536 · LBN 537 · LBN 540 · LBN 544 · NGC 7510 · Sh2-157 · The star 2 Cas

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Sh2-157 Lobster Claw Nebula

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Sh2-157 Lobster Claw Nebula

This is an emission nebula in the constellation Cassiopeia, and lies about 11,000 lightyears away. The red-orange-yellow areas have a lot of glowing hydrogen and sulfur gas, while the blue areas have more glowing oxygen.

I love imaging in narrowband on my 4" Takahashi refractor -- most of the light pollution is cut out by using the narrowband filters, and the stars are pretty nice. I've gotten my narrowband processing routine down so that I don't often have to do a whole lot of color correction to get the colors I want out of these Hubble Palette images -- mainly, I stretch the Ha, OIII, and SII images separately using GeneralisedHyperbolicStretch, and then I combine them post-stretch. I'll run a little SCNR (not totally nuking the green from Ha, but reducing it), and then after extracting the stars, I use ColorMask to work on individual colors. The stars usually come out magenta in Hubble palette images -- a super simple way to fix this is to invert the stars-only image, then run SCNR on the now-green stars (I do like 90%), and then un-invert. Then you get approximations of star color, which is nice -- whites, oranges, yellows, and some blues. Then I add the stars and starless images back together using PixelMath,, just straight adding them.

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Status	Advanced success
Started	...
Astrometry.net job	8859954
PixInsight job	1KVBU24S6IJU3PNKFGKMY5MWZYI6RZU2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h16m03s.31
RA (top/left)	23h23m39s.56
RA (top/right)	23h08m25s.100
RA (bottom/right)	23h08m45s.86
RA (bottom/left)	23h23m21s.19

Dec (center)	+60°02′22″.7
Dec (top/left)	+60°44′05″.3
Dec (top/right)	+60°43′58″.2
Dec (bottom/right)	+59°19′05″.4
Dec (bottom/left)	+59°19′08″.6

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Sh2-157 Lobster Claw Nebula

Sh2-157 Lobster Claw Nebula

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Sh2-157 Lobster Claw Nebula

Sh2-157 Lobster Claw Nebula

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