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Abell 39 O3LRGB

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#1 vakulenko_sergiy

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Posted 12 September 2019 - 08:48 AM

My ED80 doubled is not right scope to shoot over PN, but PNs are my favorite objects and I could not resist to capture one of them smile.gif

 

Image on Astrobin

get.jpg?insecure

 

Fullsize: Abell 39 O3LRGB

 

Capture details.

Atik383L, EFW2, SW ED80 PRO + 0.85x SW FFR на AZ-EQ6 c гидированием; гид — QHY5 + OAG.

Baader L: 25 x 180s;
Baader R: 19 x 180s;
Baader G: 19 x 180s;
Baader B: 29 x 180s;
Baader O3: 48 x 1800s;

 

Abell 39 is a low surface brightness planetary nebula in the constellation of Hercules. It is estimated to be about 6,800 light-years from earth. It is almost perfectly spherical and also one of the largest known spheres with a radius of about 2.5 light-years.

 

Its central star is slightly west of center by about 2″ or 0.1 light-years. This offset does not appear to be due to interaction with the interstellar medium, but instead, it is hypothesized that a small asymmetric mass ejection has accelerated the central star. The mass of the central star is estimated to be about 0.61 M☉ with the material in the planetary nebula comprising an additional 0.6 M☉. The central star is classified as a subdwarf O star.

 

This planetary nebula has a nearly uniform spherical shell. However, the eastern limb of the nebula is 50% more luminous than the western limb. Additionally, irregularities in the surface brightness are seen across the face of the shell. The source of the east-west asymmetry is not known but it could be related to the offset of the central star.

 

This planetary nebula has been expanding for an estimated 22,100 (+1700−1500) years, based on an assumed expansion velocity between 32 and 37 km/s and a 0.78 parsec radius.
© Wikipedia


  • Scott Mitchell, buckeyestargazer, psandelle and 6 others like this

#2 Barlowbill

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Posted 12 September 2019 - 09:00 AM

Beautiful

Thanks



#3 Andreas_Roerig

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Posted 12 September 2019 - 04:46 PM

Looks great! 

 

Andreas



#4 vakulenko_sergiy

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Posted 12 September 2019 - 07:04 PM

Beautiful

Thanks

 

Looks great! 

 

Andreas

Thank you!



#5 Jim Thommes

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Posted 15 September 2019 - 01:35 PM

The composition field is nice. Very good looking image.



#6 vakulenko_sergiy

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Posted 16 September 2019 - 12:45 PM

The composition field is nice. Very good looking image.

Thank you Jim!




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