Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
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OU4 (Giant Squid Nebula) and a part of Sh2-129 (Flying Bat Nebula), 



    
        

            snakagawa
OU4 (Giant Squid Nebula) and a part of Sh2-129 (Flying Bat Nebula)
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OU4 (Giant Squid Nebula) and a part of Sh2-129 (Flying Bat Nebula)

Getting plate-solving status, please wait...
OU4 (Giant Squid Nebula) and a part of Sh2-129 (Flying Bat Nebula), 



    
        

            snakagawa
OU4 (Giant Squid Nebula) and a part of Sh2-129 (Flying Bat Nebula)
Powered byPixInsight

OU4 (Giant Squid Nebula) and a part of Sh2-129 (Flying Bat Nebula)

Technical card


Basic astrometry details

Astrometry.net job: 670497

RA center: 21h 11' 47"

DEC center: +59° 59' 24"

Pixel scale: 2.212 arcsec/pixel

Orientation: 89.199 degrees

Field radius: 1.074 degrees


Resolution: 2733x2179

Description

C8 Faster+Hyperstar 3 at 425mm and F/2.66 (effective F/3).Atik460ex (mono) at -10 deg C.

I used an aperture mask as used by Mike Hawtin and "Ikonnikov" at the Astrobin. The mask really reduces the star size for a minimal loss of lights (particularly for narrowband but I have not tested quantitatively). Also, the Hyperstar adapter provided by Starizona was too long (~1.5mm) and filing it down to the correct length improved the star size by 5-10%. The images were taken over 4 nights between torrential rain, hail storm, murky sky, and equipment failure (my mount's control board [Losmandy G11] failed) to top off.

Oiii 10min x 67, 1min x 30
Ha 10min x 28, 1min x 20
Sii 10min x 14, 1min x 30
All with Astrodon 5nm filter.

The color palette is a mix (50:50) of natural color and HST. Processed by ImagesPlus, Photoshop, and Registar.

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Sky plot

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Histogram

OU4 (Giant Squid Nebula) and a part of Sh2-129 (Flying Bat Nebula), 



    
        

            snakagawa