M33 - The Triangulum Galaxy (AstroDarkSky)

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M33 - The Triangulum Galaxy

Acquisition:

My first time using the 3:1:1:1 guidance around LRGB. As in 3 Luminance exposures per 1 Red, 1 Green, 1 Blue. I also added a bonus night of Ha data that added a bit of red/pink to the data. Processing the L channel to the best of my ability pulled a lot more detail out than previous years where I used just R,G,B filters or a OSC camera.

Processing:

Wavelet layers were the key to pulling details out via Multiscale median transform within Pixinsight using 9 layers. I use the Script->Image Analysis->Extract Wavelet layers to zero in on the features I want to draw the eye's focus towards and taper to smaller values above and below that target central layer.

For noise reduction, I use the least amount as possible on the galaxy so it leaves a bit of grain while I pull the details out in wavelets. At the end of processing, I will apply subsequent noise reduction at higher levels to taste. However, for the background, if it isn't signal and there's obvious noise, I will create a L mask on the whole image, invert/apply, and be bit more aggressive on noise reduction on the non signal areas(sky).

Ha applied via PixelMath with the following values:

R = max($T[0], 1.2*Ha)
G= $T[1]
B = iif($T[0]<Ha, $T[2] + 0.06*Ha, $T[2])

GraXpert My first usage of this free tool and I am very impressed! There was a tricky blue gradient extending past the galaxy arms and this tool removed it without smashing the spiral arms' blueness. Pretty quick placement of automatic sample points via a slider that would have been far more time consuming manually in DBE and DBE was producing worse results. I could have spent hours in DBE and probably made it work eventually I'm sure, but the time savings with GraXpert plus the results are amazing without a lot of fiddling and parameter tweaking.

Messier Objects
IOptron CEM
ZWO ASI2600MM Pro
William Optics Fluorostar Series

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Status	Advanced success
Started	...
Astrometry.net job	8608105
PixInsight job	4H3JMT93QAI96JXC8RKDQUHC0PZ0BDC0
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h33m50s.628
RA (top/left)	01h34m23s.850
RA (top/right)	01h35m56s.457
RA (bottom/right)	01h33m17s.666
RA (bottom/left)	01h31m45s.884

Dec (center)	+30°39′55″.91
Dec (top/left)	+30°04′03″.96
Dec (top/right)	+31°04′33″.86
Dec (bottom/right)	+31°15′48″.60
Dec (bottom/left)	+30°15′09″.24

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M33 - The Triangulum Galaxy

M33 - The Triangulum Galaxy

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M33 - The Triangulum Galaxy

M33 - The Triangulum Galaxy

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Description

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