IC417 & NGC1931 - The spider & fly HaRGB (Göran Nilsson)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: 24 phi Aur · IC 417 · NGC 1931 · Sh2-234 · Sh2-237 · The star φAur

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IC417 & NGC1931 - The spider & fly HaRGB

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IC417 & NGC1931 - The spider & fly HaRGB

Last nigh was cloudless and virtually moonless but seeing was not great so my guiding was poor, ca 1.0 - 1.5 "/pixel. I was aiming at these neublae with my double Esprit rig. I collected RGB with Esprit 150 and ASI071, and managed to get 82 x 5 min (6.8 hours) before the obsy wall got in the way. Ha was collected with the Esprit 100 and ASI1600MM but after the flip around 22.00, the gain apparently got stuck at the very high setting I used for focusing, so while I took the dog for a last walk and then went to bed, it was just collecting blown out wite frames. So, I ended up with the 4 x 15 min Ha I had before the flip. I added this sparingly to the red channel.

Here is what is written for an APOD image of these nebulae: Will the spider ever catch the fly? Not if both are large emission nebulas toward the constellation of the Charioteer (Auriga). The spider-shaped gas cloud on the right is actually an emission nebula labelled IC 417, while the smaller fly-shaped cloud on the left is dubbed NGC 1931 and is both an emission nebula and a reflection nebula. About 10,000 light-years distant, both nebulas harbor young, open star clusters. For scale, the more compact NGC 1931 (Fly) is about 10 light-years across.

ASI 071 mcc
The OSC Club (One Shot Camera)

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Status	Advanced success
Started	...
Astrometry.net job	3234925
PixInsight job	UAS43VXGRA88N9RYQKLBUYH7JTQ1PW8B
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	05h29m24s.78
RA (top/left)	05h32m51s.73
RA (top/right)	05h26m49s.50
RA (bottom/right)	05h25m59s.20
RA (bottom/left)	05h31m57s.68

Dec (center)	+34°19′51″.2
Dec (top/left)	+34°35′59″.4
Dec (top/right)	+34°52′24″.7
Dec (bottom/right)	+34°03′20″.2
Dec (bottom/left)	+33°47′04″.3

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IC417 & NGC1931 - The spider & fly HaRGB

IC417 & NGC1931 - The spider & fly HaRGB

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IC417 & NGC1931 - The spider & fly HaRGB

IC417 & NGC1931 - The spider & fly HaRGB

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