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

For my two RASAs this is IFN season. 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. Here is an image with quite a lot of galaxies behind the IFN and version A shows an annotation of them (done in PI).

I have recently had quite a lot of messages from disappointed RASA users aiming at IFN under more light polluted skies. 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, with more light pollution, like at Bortle 4-5, 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, so at SQM 20.6 (Bortle 4.5), you would need 14 hours and at SQM 19.6 (Bortle 5) your will need 30 hours.

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B

B

Description: Un-annotated version

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Celestron RASA
The OSC Club (One Shot Camera)
ZWO ASI 2600MC PRO
"Nordish by nature"
Cooled Color Cams

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Status	Advanced success
Started	...
Astrometry.net job	4386619
PixInsight job	OTPUB9AA0TF5TQNJRP6W6QCGM02ONGYE
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	10h36m24s.74
RA (top/left)	11h03m30s.38
RA (top/right)	10h12m06s.80
RA (bottom/right)	10h12m17s.66
RA (bottom/left)	10h57m08s.21

Dec (center)	+72°58′08″.4
Dec (top/left)	+73°55′11″.4
Dec (top/right)	+74°16′06″.1
Dec (bottom/right)	+71°48′59″.9
Dec (bottom/left)	+71°30′51″.0

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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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