NGC4236 - A Spiral Galaxy in Draco (Daniel.P)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: NGC 4236

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NGC4236 - A Spiral Galaxy in Draco

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Powered byPixInsight

NGC4236 - A Spiral Galaxy in Draco

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

This is a picture performed in collaboration with my friend Fabian Rodriguez who took 35 x 240s OSC exposures with its APO 115mm. Altogether this was over 15 hours of exposures we achieved together ! The result is especially interesting with its own process showing the galaxy in the full field of the APO115 (see version "original")

However, I found difficult to combine the OSC color with the mono color channels. I end up using PixelMath to perform straight addition of the 2 color images, using estimated coefficients.

Processing in PI

- Dark & Flat calibration of L, R, G, B & Ha channels

- Cosmetic Correction

- Registration

- Integration

- Mure Denoise

- Build RGB image using additional calibrated OSC data from Fabian

- Add Ha to R channel using PixelMath

- DBE L & RGB images

- MultiScaleMedianTransform denoise

- Delinearisation of L, Ha and RGB images using HT

- Extract a & b color channels from RGB image

- Combine L, a & b channels

- Color saturation (and desaturate bkg)

- TGV denoise

In Mac Photo : crop, deflip, levels, sharpness

Original
Final
B

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Status	Advanced success
Started	...
Astrometry.net job	3477665
PixInsight job	9CUHBWKIMYKXRX41Y37SKD11GHFJCPD5
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h16m41s.811
RA (top/left)	12h23m33s.710
RA (top/right)	12h10m06s.534
RA (bottom/right)	12h10m06s.780
RA (bottom/left)	12h23m01s.800

Dec (center)	+69°27′05″.80
Dec (top/left)	+69°51′39″.39
Dec (top/right)	+69°53′36″.38
Dec (bottom/right)	+69°01′35″.58
Dec (bottom/left)	+68°59′43″.53

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NGC4236 - A Spiral Galaxy in Draco

NGC4236 - A Spiral Galaxy in Draco

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NGC4236 - A Spiral Galaxy in Draco

NGC4236 - A Spiral Galaxy in Draco

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