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Sh2-132 the Lion Nebula processed using Starnet++

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#1 Dave53N

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Posted 24 August 2019 - 10:29 PM

I managed to collect 1h 18m of data for this target two nights ago. The stars in the final image tended to overwhelm the nebula, so I tried removing the stars using Starnet++, a great piece of software by Nikita Misiura.  This worked very well and was reasonably fast on my laptop (~10m).  This starless image was then combined with the original image using Gimp 2.10 allowing the nebula to be preferentially stretched. It was then noise reduced with RawTherapee 5.5. 

 

Sh2-132 is apparently  illuminated in part by two very hot UV emitting Wolf-Rayet stars (WR 152 and WR 153).

I have attached an annotated version in the following post showing  WR 152 and 153 as well as some of the dark nebulae, feel free to correct or add  any other objects.

 

Comments and suggestions for improvement welcome.

 

Dave

 

Equipment:
Scope: ES ED102-FCD100 at f7 (714mm) with Starfield  field flattener
Camera: ASI294MC-Pro
Mount: CEM60
Guide scope: Starfield 60mm with ASI120mm-S
Filter: IDAS NB1 nebula contrast enhancer.
Guiding error ~0.7 arc sec total RMS
Moon 54%, SQM-LU reading 19.8

Exposures, all at gain 200 and -15C:
Lights: 39 x 120s; Darks: 40 x 120s; Flats: 7s with LED pad; Dark flats: 7s.
Integration 1h 18m.

Processing software: DSS, APP, GIMP 2.10, Starnet++ and RawTherapee

 

Sh2-132_Port_NB1_UVIR_2019-08-22_120sec_ED102_ASII294MC_200G_-15C_78m_39L_40D_40F_40DF_AveSigKap-lpc-cbg-lpc-cbg-balrgb_starcal-St plus starless RT5 1600px.jpg


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#2 Dave53N

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Posted 24 August 2019 - 10:30 PM

Here is the annotated version:

 

Sh2-132_Port_NB1_UVIR_2019-08-22_120sec_ED102_ASII294MC_200G_-15C_78m_39L_40D_40F_40DF_AveSigKap-lpc-cbg-lpc-cbg-balrgb_starcal-St plus starless RT5 1600px ann.jpg


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#3 stargazer60

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Posted 24 August 2019 - 10:43 PM

Very nice image great detail !  Keep up the good work. waytogo.gif 



#4 Dave53N

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Posted 25 August 2019 - 11:14 AM

Many thanks stargazer60

 

Dave



#5 Tayson82

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Posted 27 August 2019 - 03:49 AM

Nice lion :)

How did You add stars to final photo after separate it by starnet?


Edited by Tayson82, 27 August 2019 - 03:49 AM.


#6 Dave53N

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Posted 27 August 2019 - 08:07 PM

Thanks Tayson82.  As I mentioned in my post, I combined the starless image with the original image as a separate layer using GIMP2.10. 



#7 AKHalea

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Posted 03 October 2019 - 06:14 PM

Dave : What a great image. Nice colors, especially for only 1 hour & 18 minues of data. I also gathered some 5 hours of data on this object in the last few nights. Still in the middle of processng it. Hope mine comes out as nicely as yours did ...... Anil




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