Leo Triplet (Frédéric Ruciak)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: HD98388 · IC 2708 · IC 2745 · Leo Triplet · M 65 · M 66 · NGC 3623 · NGC 3627 · NGC 3628

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Leo Triplet

Revision title: with improved stretching and LRGB balance

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Leo Triplet

Revision title: with improved stretching and LRGB balance

I had to solve a lot of issues to image the Leo Triplet over several nights, from the shift of the camera when taking flat at zenith to high clouds. I used a telemate x2 on my CF APO90 giving F12 and ~1080mm focal length. At the end over 3 nights I got enough data to process and produce this image. Among the 7h30, half is weighting twice as less as the first half at least. At 0.7 arcsec/pixel the guiding of my AM5 at ~0.6arcsec RMS with crazy times at 1arcsec sometimes, becomes a challenge to produce crispy images. I am experimenting LRGB processing with an OSC (extracting R G and B during WBPP and then extracting L from the first RBG combination). I am still looking for a better understanding and mastering.

Original
B
Final
C

B

Title: with improved stretching and LRGB balance

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C

Title: Improved lower background

Description: I do not know where my background comes from (high light pollution, not enough integration, ??) but sometimes I have too strong background compared to valuable signal. I found a way to lower it with PI. 1 StarXterminator (unscreen), 2 create a gradient edge mask with GAME for the remaining objects, 3 blur the mask to smooth the transition from background to objets, 4 apply the mask to the starless image and invert it, 5 use histogram transformation to lower the background solely, 6 inhihit the mask, 7 rescreen the stars. You can eventually add a step 4.0 with clonestamp if you have some wild donuts in your background (poor flats or new dust). It is maybe widely known but I built it starting from a demonstration of clonestamp.

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Status	Advanced success
Started	...
Astrometry.net job	9605983
PixInsight job	ZFA0NL2MX2SIVCMJOJV4LKBDB1J885E5
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	11h19m54s.871
RA (top/left)	11h19m29s.686
RA (top/right)	11h17m14s.936
RA (bottom/right)	11h20m20s.240
RA (bottom/left)	11h22m35s.230

Dec (center)	+13°12′01″.41
Dec (top/left)	+13°55′51″.61
Dec (top/right)	+12°51′07″.40
Dec (bottom/right)	+12°28′04″.17
Dec (bottom/left)	+13°32′52″.34

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Leo Triplet

Revision title: with improved stretching and LRGB balance

Leo Triplet

Revision title: with improved stretching and LRGB balance

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Leo Triplet

Revision title: with improved stretching and LRGB balance

Leo Triplet

Revision title: with improved stretching and LRGB balance

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