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Sh2-129_OU4 in HST palette

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#1 Gordon Haynes

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Posted 05 August 2014 - 03:29 PM


This has been my toughest target to date mainly because of the extremely faint OU4 (Giant Squid Nebula) that lies within Sh2-129 (Flying Bat Nebula). They are strange objects in that there is Ha and SII in Sh2-129 but no OIII that I could detect and OU4 only has OIII but no Ha and SII. OU4 was discovered in 2011 by French astroimager Nicolas Outters hence the designation OU4 and it is thought to be a bi-polar planetary nebula.

Exposure times are as follows

Ha = 28x10 minutes

OIII = 45x10 minutes

SII = 23x10 minutes

As with all my current images this was taken with the Televue NP127/FLI astrograph that I'm testing on my Paramount ME with auto guiding done by a Starlight Xpress Lodestar on an Officine Stellare Falco guide scope using dithering between exposures.

The image is still a bit noisy which may be resolved by shooting more data but I'm reasonably happy with the result as my main aim was to get the squid to show. The blue channel (OIII) required more stretching than the Ha and SII hence the bluish background and didn't show any detail at all on the downloads or the stacked master frame, it didn't start to show until after the second iteration of curves before colour combining

The full size image can be seen at the following link




Thanks for looking

Best wishes


Attached Files

#2 Jim Thommes

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Posted 06 August 2014 - 10:48 PM


Nicely done image. It is interesting to see these two objects and how they are so astrophysically and visually different. Makes me wonder if they are at different distances and just visually superimposed. Anyone know?


#3 Gordon Haynes

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Posted 06 August 2014 - 11:15 PM

According to some of the information that I've read OU4 is within Sh2-129, which makes it all the more peculiar

#4 elbee


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Posted 07 August 2014 - 06:49 PM

Ou4 and SH2-129 are both believed to surround the bright central star HR 8119.    you can download the PDF research paper here   http://arxiv.org/abs/1206.2477  (see the PDF link on the right side of the page).   also, nicolas' web page has more details (but you may want to use google translate to get it into english :-)  http://outters.fr/pn.html


btw - nice field, gordon!

#5 Harel_Boren


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Posted 08 August 2014 - 06:14 PM

Lovely. I got the squid and bat brewing as well :)

will soon invite you all for the mmeal cheers, Harel

#6 Nicola


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Posted 13 August 2014 - 07:51 AM

Not too bad ;)

#7 deeploo.at


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Posted 14 August 2014 - 04:45 PM

Hi Gordon,


OU 4 is a tough target, you did a good job!


Regards, Markus

#8 kfir Simon

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Posted 18 August 2014 - 05:09 AM

Very nice - 3D



#9 bill w

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Posted 18 August 2014 - 12:45 PM

nice job

love your handling of the planetary

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