Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  IC 443
IC 443 - 0-III, Ha, Broadband : The Medusa Nebula appearing !, 



    
        

            Ewam
IC 443 - 0-III, Ha, Broadband : The Medusa Nebula appearing !
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IC 443 - 0-III, Ha, Broadband : The Medusa Nebula appearing !

Acquisition details

Dates:
May 1, 2015
Frames:
50×215(2h 59′ 10″)
Integration:
2h 59′ 10″
Avg. Moon age:
12.31 days
Avg. Moon phase:
93.32%

Basic astrometry details

Astrometry.net job: 641288

RA center: 06h17m30s.5

DEC center: +22°4055

Pixel scale: 1.017 arcsec/pixel

Orientation: 176.618 degrees

Field radius: 0.580 degrees

Resolution: 620x511

File size: 358.5 KB

Locations: La Gueule du Loup (Malonne), Namur, Namur, Belgium

Description

Finaly, I got round to reprocess all the subs I ever took (4 nights) of this crescent I couldn't quite capture so far. This is in no way a master piece but compared to my first edition... See here, if you care : http://astrob.in/170072/G/

It is heavily croped, due to my early negligence to keep the same framing of the target !

The list of subs is so "eclectic" that it defies good sense, but as nothing seemed to work, I kept trying different settings.

VERSION B : Radical change in the mix ; endless compromises... I thing the right way will be the "Hubble palet" with my 3 filters, and forget the lum.

In brief, there are 3 sets of O-III subs, from 300 to 420 sec, from 2000iso to 3200iso ;

2 sets of UHC subs @ 330 & 420 sec ;

3 sets of broadband, from 45 sec to 3 minutes ;

1 short set of Ha @ 450 sec... Experience this summer reveals, I'll need to push it to 600'' and get twice as much frames.

Last session was quite hard, with the nebula low down in the early evening...

Next year, I'll do a full Ha - SII - O-III session with hopefully better result.

Comments

Revisions

  • Final
    IC 443 - 0-III, Ha, Broadband : The Medusa Nebula appearing !, 



    
        

            Ewam
    Original
  • IC 443 - 0-III, Ha, Broadband : The Medusa Nebula appearing !, 



    
        

            Ewam
    B

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IC 443 - 0-III, Ha, Broadband : The Medusa Nebula appearing !, 



    
        

            Ewam