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LRGB Horsehead and Flame Nebulas

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#1 SilverLitz

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Posted 23 February 2020 - 05:34 PM

Here is my 1st attempt at LRGB Horsehead and Flame Nebulas, B33 and NGC 2024, from my suburban Louisville, KY backyard.  It was shot with my ASI183mm-Pro and ZWO 36mm Premium RGB filters, using my Esprit 100 with the TSAPORED075 FF/FR at 413mm, f/4.13.   Processed with PixInsight.

 

Lum           30sec x   226

R               60sec x    95

G               60sec x    95

B               60sec x    96

 

I got 3 straight clear/dark nights, Thu-Sat, after almost no good skies for a couple of months. It is a little late in the season for these targets, as I had only about 40min pre-meridian, after sunset, and 2 hours post-meridian, before target rotated into my house's roof.  I would have liked another night to get some Ha, but weather is going to get bad starting tonight.

 

I notice that my bottom left corner is dark purple; is that correct?

 

Also, Alnitak is a nasty bright beast.  I tried to mask my AS stretch, but I got rings, so I did AS straight up (several passes) followed by MS and HT.  Is there a good post-processing strategy for Alnitak?

 

HH_RGB (LoRes).JPG


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#2 Gipht

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Posted 23 February 2020 - 06:15 PM

Beast is a good description.  You can see the double star, which is a sign of good processing.  Looking through my old pictures, I could not any find purple in the area of the flame Nebula.



#3 PhotonHunter1

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Posted 25 February 2020 - 07:06 PM

Amp glow? Light flare from the “beast?” Or stray light entering your optical path?


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#4 sunnyday

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Posted 25 February 2020 - 08:41 PM

this photo gives us precise detail. well done .


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#5 SilverLitz

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Posted 26 February 2020 - 10:51 AM

Amp glow? Light flare from the “beast?” Or stray light entering your optical path?

I do not see any residual amp glow.  The "beast's" large halo causes some purple coloration in the upper part of the Flame.  The dark purple I was referring to is in very bottom-left corner, which to me (though a newbie) seems more like gradient color.  I have done DBE.




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