Heart & Soul Nebulas (IC 1805 and 1848) and the Perseus Double Cluster (NGC 869 and 884) (Doug Gray)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: B201 · Double cluster · IC 166 · IC 1747 · IC 1795 · IC 1805 · IC 1824 · IC 1831 · IC 1848 · IC 289 · NGC 1027 · NGC 1220 · NGC 637 · NGC 743 · NGC 744 · NGC 869 · NGC 884 · NGC 896 · NGC 957 · Part of the constellation Perseus (Per) · Sh2-189 · Sh2-190 · Sh2-191 · Sh2-192 · Sh2-193 · Sh2-194 · Sh2-195 · Sh2-196 · Sh2-197 · Sh2-198 · And 14 more.

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Heart & Soul Nebulas (IC 1805 and 1848) and the Perseus Double Cluster (NGC 869 and 884)

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Heart & Soul Nebulas (IC 1805 and 1848) and the Perseus Double Cluster (NGC 869 and 884)

Heart Nebula, Soul Nebula, Fishhead Nebula, and the Perseus Double Cluster, all in one narrowband shot with room to spare.

Long list of learnings on this project. After seeing the coma in my previous 35mm shots with the aperture wide open, I managed to create a 4mm plastic spacer out of a zip-tie to keep the speed set to around f/2-and-a-half-ish. That, and some cropping, seems to have done the trick.

Prior to this project I had only taken flats in the Luminance channel and could not figure out why I had these strange glowing patterns in very long exposures in the Ha channel. These Antlia filters are not parafocal (Ha & SII are close), so I should have guessed this would be a big deal. Getting those flats right makes much more of the image usable (although I still cropped quite a bit in this case).

The other thing that I learned on this project was the wisdom of editing each color channel separately in monochrome before combining. It takes more time for sure, but I can't see as much detail in the red and blue channels otherwise. This really helps when trying to remove the gradients.

Milky Way, Nightscapes and Widefields (CMOS)

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Status	Advanced success
Started	...
Astrometry.net job	4117280
PixInsight job	WDDUYOGOKOALD7YMMFM1HPSOZMVU03HN
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h37m27s.1
RA (top/left)	03h43m33s.0
RA (top/right)	03h14m07s.7
RA (bottom/right)	01h58m09s.9
RA (bottom/left)	01h34m11s.3

Dec (center)	+59°21′58″
Dec (top/left)	+67°26′36″
Dec (top/right)	+49°48′03″
Dec (bottom/right)	+49°59′12″
Dec (bottom/left)	+67°48′16″

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Heart & Soul Nebulas (IC 1805 and 1848) and the Perseus Double Cluster (NGC 869 and 884)

Heart & Soul Nebulas (IC 1805 and 1848) and the Perseus Double Cluster (NGC 869 and 884)

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Heart & Soul Nebulas (IC 1805 and 1848) and the Perseus Double Cluster (NGC 869 and 884)

Heart & Soul Nebulas (IC 1805 and 1848) and the Perseus Double Cluster (NGC 869 and 884)

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