Elephant Trunk in HaOIII with Synthetic Green Channel (Jim Lindelien)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: B160 · B161 · B162 · B163 · B365 · B367 · Erakis · IC 1396 · PK097+03.1 · PK100+04.1 · Sh2-131 · The star Garnet Star (μCep) · VdB142 · mu. Cep

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Elephant Trunk in HaOIII with Synthetic Green Channel

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Elephant Trunk in HaOIII with Synthetic Green Channel

The glorious IC1396.

I acquired this image data some time ago through narrowband filters on a Bayer sensor, and so it was double filtered at some loss of efficiency. That said the object is so bright it hardly mattered. This was back in the days of waiting for a full frame mono CMOS camera to become available.

For the Ha data I kept the CFA(0) subarray of the OSC sensor (PI's SplitCFA process...), and for the OIII data I combined the CFA(1),CFA(2) and CFA(3) subarrays, first calibrating these with their corresponding master bias, dark and flat frame CFA(n) subsets. This way, for the OIII data I obtained 120 lights from 40 actual 120sec exposures.

From this bi-color dataset a synthetic green channel was created from 1.25*Ha*OIII, re-normalizing the data range to not clip the highlights.

All CFA subarray sets were drizzle integrated at 2x to synthetically restore native sensor resolution, post processed, then down-sampled and edge cropped for publication.

To the front of the RASA astrograph I mounted a spider vane in a dew shield and to that attached flat power and data cables to the front-mounted camera, to control halos and diffraction artifacts.

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Since then I've added an ASI6200MM-Pro and am in the middle of repeating this object on that sensor to compare the results.

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Cooled Color Cams
Celestron RASA
Narrowband imaging
The OSC Club (One Shot Camera)

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Status	Advanced success
Started	...
Astrometry.net job	3749444
PixInsight job	ZITCI0VSCN38F7VANOQRUS8X97G6JEHT
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h39m31s.45
RA (top/left)	21h47m10s.88
RA (top/right)	21h47m52s.48
RA (bottom/right)	21h31m10s.80
RA (bottom/left)	21h31m52s.27

Dec (center)	+57°30′01″.8
Dec (top/left)	+55°53′03″.8
Dec (top/right)	+59°05′05″.1
Dec (bottom/right)	+59°05′05″.0
Dec (bottom/left)	+55°53′08″.5

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Elephant Trunk in HaOIII with Synthetic Green Channel

Elephant Trunk in HaOIII with Synthetic Green Channel

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Elephant Trunk in HaOIII with Synthetic Green Channel

Elephant Trunk in HaOIII with Synthetic Green Channel

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