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Contains:  Sh2-129
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Ou4 The Squid Nebula...Sh2-129, LBN 445, 449, 453, 


            Alex Woronow
Powered byPixInsight

Ou4 The Squid Nebula...Sh2-129, LBN 445, 449, 453

Technical card

Imaging telescope or lens:Astro-Physics RH 305 RH 305

Software:StarNet++MatLab R2019aPixInsight

B: 8x300"
G: 13x300"
H: 19x1200"
O: 23x1200"
R: 14x300"

Integration: 16.9 hours job: 2765448

RA center: 21h 12' 20"

DEC center: +59° 56' 20"

Pixel scale: 3.388 arcsec/pixel

Orientation: 178.837 degrees

Field radius: 1.216 degrees

Resolution: 1828x1828

Data source: Amateur hosting facility

Remote source: DeepSkyWest


Ou4 (the Squid Nebula) and Sh2-129, LBN 445,449,453
OTA: RH-305 (12” f/3.5)
Camera: SBIG STX-16803
Observatory: Deep Sky West
Red: 14 x 300 seconds
Blue: 8 x 300
Green: 13 x 300
Luminosity 13 x 300 (see below)
Hydrogen: 19 x 1200
Oxygen: 23 x 1200
Total exposure ~18 hours
Image Width: ~1.75 deg
Processed by Alex Woronow using PixInsight, StarNet++ and custom Matlab code. Processed in 2019;
North is toward the bottom
Ou4, (the blue nebula) was discovered in 2011 by an amateur astronomer, Nicolas Outters. Its faintness and the fact that it is emitting faint light primarily in the OIII (blue-green part of the spectrum) made it difficult to detect. The surrounding red hydrogen-emission nebula (Sh2-129) also known as the ‘Flying Bat Nebula’.
Recent studies (R.L.M. Corradi, et al, 2014) suggest that OU4 lies within Sh2-129 at a distance of about 2,300 light-years. At this distance, the Squid would be about 50 light-years in length (projected size??). OU4 possibly results from an outflow of gasses from the triple star system, HR8119, located in the center of the nebula. The Squid has an estimated age of only 90,000 years, based on its measured expansion rate.
Processing: The Luminosity images were not used in this version. The Hydrogen alpha was blended into the red channel using an algorithm that proportions the hydrogen contribution according to the relative exposure times and bandwidths of the red and Ha filters. The same was done with the OIII with equal contributions going into the blue and green channels.
Sharpening utilized the Local Laplacian Pyramid algorithm based on Paris, et al. 2011 (Proc. SIGGRAPH, 2011)and implemented in Matlab. The StarNet++ used for this image was the recently-available version for PixInsight procedure.



Alex Woronow
License: None (All rights reserved)

Sky plot

Sky plot


Ou4 The Squid Nebula...Sh2-129, LBN 445, 449, 453, 


            Alex Woronow