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Ou4 (and SH2 129): A Giant Squid Nebula and a Flying Bat, 


            Harel Boren
Ou4 (and SH2 129): A Giant Squid Nebula and a Flying Bat

Ou4 (and SH2 129): A Giant Squid Nebula and a Flying Bat

Technical card

Resolution: 1484x1101

Dates:July 27, 2014

Frames: 57x900"

Integration: 14.2 hours

Avg. Moon age: 0.49 days

Avg. Moon phase: 0.28% job: 533002

RA center: 318.378 degrees

DEC center: 60.007 degrees

Pixel scale: 4.146 arcsec/pixel

Orientation: 90.815 degrees

Field radius: 1.064 degrees

Locations: Negev Desert, Mizper Ramon, Israel


This image has been processed to reveal the light teal haze at the bottom side of the squid.
In processing the previous version of this image I have taken special care to maintain the accurate teal color of OIII - an even combination of blue and green. However, this approached has caused the whole image color balance to lean towards the OIII haze. Bob Franke was alert to this result, and has offered to bring back the balance of colors by bringing up the black-point of both blue and green, to that of the red. Consequently, the red Bat (under the blue-green Squid) is now far more visible.

A mysterious, squid-like apparition, this nebula is very faint, but also very large in planet Earth's sky. In the image, composed with narrowband data from the Israeli Negev desert, it spans some 2.5 full moons toward the constellation Cepheus. Recently discovered by French astro-imager Nicolas Outters, the remarkable nebula's bipolar shape and emission are consistent with it being a planetary nebula, the gaseous shroud of a dying sun-like star, but its actual distance and origin are unknown. A new investigation suggests Ou4 really lies within the emission region SH2-129 some 2,300 light-years away. Consistent with that scenario, the cosmic squid would represent a spectacular outflow of material driven by a triple system of hot, massive stars, cataloged as HR8119, seen near the center of the nebula. If so, this truly giant squid nebula would physically be nearly 50 light-years across. (ref:



Harel Boren
License: None (All rights reserved)

Sky plot

Sky plot


Ou4 (and SH2 129): A Giant Squid Nebula and a Flying Bat, 


            Harel Boren