IFN between NGC3403 and NGC3147 in Draco (Göran Nilsson)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: IC 2600 · IC 2601 · NGC 3144 · NGC 3147 · NGC 3183 · NGC 3252 · NGC 3343 · NGC 3348 · NGC 3364 · NGC 3403

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IFN between NGC3403 and NGC3147 in Draco

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IFN between NGC3403 and NGC3147 in Draco

I continue using the Star Xterminator filter in PS to get better control of my star fields, which is particularly needed for the very faint Integrated Flux Nebulae (IFN). So here is a reprocessing of data I gathered in April 2021, now with much brighter nebulosity and a better controlled star field than in my previous attempt.

IFN (Integrated Flux Nebulosity) is thought to be dust at the outskirts of our galaxy energized by the collective radiation of the galaxy. I do find that there seem to be a variety of IFN when it comes to colour and structure. There is also an abundnce of galaxies behind the IFN, NGC 3147 and 3348 being the most prominent.

Hunting IFN is a very rewarding activity under dark skies, and I have a quite dark site. SQM was around 21.6 these nights, so Bortle 2. Sadly, at a site with more light pollution, many times longer integration times will be needed get an S/N ratio good enough to get a decent IFN image. For every unit decrease in SQM, 2.5 times more integration time is needed.

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Status	Advanced success
Started	...
Astrometry.net job	5175121
PixInsight job	SMC9445YXECYDB0RSJ8YYV6VT7GGOX2K
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	10h36m24s.64
RA (top/left)	11h04m14s.70
RA (top/right)	10h11m29s.47
RA (bottom/right)	10h11m49s.70
RA (bottom/left)	10h57m35s.66

Dec (center)	+72°58′26″.4
Dec (top/left)	+73°57′01″.10
Dec (top/right)	+74°18′31″.1
Dec (bottom/right)	+71°47′16″.1
Dec (bottom/left)	+71°28′36″.3

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IFN between NGC3403 and NGC3147 in Draco

IFN between NGC3403 and NGC3147 in Draco

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IFN between NGC3403 and NGC3147 in Draco

IFN between NGC3403 and NGC3147 in Draco

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