SH2-129 is a relatively faint emission nebula in Cepheus, a neighbor of the larger and more often imaged IC 1396. Sometimes referred to as the “Flying Bat” nebula, this region is characterized by Ha emission as well as a small, mixed emission and reflection nebula (vdB 140). What is most remarkable about this region is a recent discovery made in 2011 by Nicolas Outters, called the “Squid Nebula” due to its shape, but more officially called Ou4.
This region is characterized by a very faint OIII emission that has a bipolar shape reminiscent of a planetary nebula. Although it was originally thought to perhaps represent a planetary nebula derived from an unknown, dying star, more recent evidence suggests that Ou4 is located within SH2-129 itself and is a bipolar outflow emitting in the OIII spectrum, moving at the same rate as SH2-129, and possibly emanating from a triple star system located in the center of Ou4.
Astrodon 36mm LRGB E Series Gen 2: 120x30" -10C bin 1x1 Astrodon Ha 3nm: 36x600" -10C bin 1x1 Astrodon OIII 3nm: 72x1200" -10C bin 1x1 Integration: 31.0 hours