M 101 LRGB (Paul Muskee)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 101 · NGC 5447 · NGC 5449 · NGC 5450 · NGC 5451 · NGC 5453 · NGC 5455 · NGC 5457 · NGC 5461 · NGC 5462 · NGC 5471 · NGC 5473 · NGC 5477 · Pinwheel galaxy

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M 101 LRGB

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M 101 LRGB

M 101 preview taken during almost full moon.

A preview which has been quickly processed to see how good this data was. Most frames are taking during almost full moon. Nonetheless, it is looking good. However, I have some serious issues with some stars which started back in my previous image. Very annoying and gonna look for the cause of this.

Regarding imaging during full moon, I do not see why it is not possible... I only had some greens to remove but nothing special. Soon I will do a very extensive test: capture a object twice with exactly the same settings but one during (full) moon and one without moon at all. Since we do not have that many clear nights in NL I really want to investigate this...

Also have the Ha data for this object, but first I want to fix the star issue... So this will get updated anytime soon...

Original
B
Final
C

B

Description: re-processed hoping that I could fix the stars... but no... will investigate further on new data sets, maybe something was wrong with this color data... I added Deconvolution to my workflow and used it on this image, the difference is subtle but very good nonetheless!

Uploaded: ...

C

Description: So I found a way to almost completely fix the issue with star colors. For that I used PixelMath with the following formula before applying a Star Mask:

R/K: $T[0]
G: iif(min($T[0],$T[2])>$T[1],min($T[0],$T[2]),$T[1])
B: $T[2]

It is not perfect, but much better nonetheless. There will come a time where I will find the perfect solution :-).

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	2664432
PixInsight job	T9WBNU02020UYS1UQGV3DVINTPFWSYI5
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h03m11s.13
RA (top/left)	14h01m22s.72
RA (top/right)	14h09m27s.43
RA (bottom/right)	14h05m04s.40
RA (bottom/left)	13h56m55s.30

Dec (center)	+54°20′55″.3
Dec (top/left)	+53°28′31″.10
Dec (top/right)	+54°20′38″.3
Dec (bottom/right)	+55°13′15″.5
Dec (bottom/left)	+54°19′59″.9

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M 101 LRGB

M 101 LRGB

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Image Index:

Contribution Index (beta):

M 101 LRGB

M 101 LRGB

Equipment

Acquisition details

Description

Comments

Revisions

B

C

Sky plot

Histogram

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