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The Flying Bat and Squid Nebulae

Picture
Sh2-129 and Ou4 in Cepheus

are an odd pair of nebulae, indeed. The large, red, emission nebula, Sh2-129 (also known as the Flying Bat) had been well known,
​at least since Flagstaff astronomer Stewart Sharpless compiled his catalog of 312 Hydrogen-alpha regions in the 1950s.
The odd, teal colored, cylindrical nebula at center is Ou4, named for its discoverer, amateur French imager, Nicolas Outters.
The extremely faint Ou4, also called the Squid, revealed
itself to Nico in OIII (Oxygen 3) data, otherwise invisible in the broadband and Ha filters.  
Many thanks to my friend Terry Hancock of Grand Mesa Observatory for providing me with this fine data.

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