Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Sh2-132 the Lion Nebula processed using Starnet++

  • Please log in to reply
5 replies to this topic

#1 Dave53N

Dave53N

    Explorer 1

  • -----
  • topic starter
  • Posts: 50
  • Joined: 12 Dec 2018
  • Loc: Central Alberta, Canada

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


  • Gregory, psandelle, mikewayne3 and 7 others like this

#2 Dave53N

Dave53N

    Explorer 1

  • -----
  • topic starter
  • Posts: 50
  • Joined: 12 Dec 2018
  • Loc: Central Alberta, Canada

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


  • elmiko and jeremiah2229 like this

#3 stargazer60

stargazer60

    Mariner 2

  • -----
  • Posts: 245
  • Joined: 28 Jan 2015
  • Loc: South Texas

Posted 24 August 2019 - 10:43 PM

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



#4 Dave53N

Dave53N

    Explorer 1

  • -----
  • topic starter
  • Posts: 50
  • Joined: 12 Dec 2018
  • Loc: Central Alberta, Canada

Posted 25 August 2019 - 11:14 AM

Many thanks stargazer60

 

Dave



#5 Tayson82

Tayson82

    Explorer 1

  • -----
  • Posts: 57
  • Joined: 17 May 2018
  • Loc: Poland / Wolomin

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

Dave53N

    Explorer 1

  • -----
  • topic starter
  • Posts: 50
  • Joined: 12 Dec 2018
  • Loc: Central Alberta, Canada

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. 




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics