description Squid Nebula Overview
The Squid Nebula, formally designated OU4, is a faint emission nebula located within the Cepheus OB Association. It’s recognized by its distinctive bipolar outflow structure, resembling a squid's tentacle. This outflow, rich in oxygen emissions, extends over one degree and is associated with several bright O-type stars. Astronomers and amateur observers interested in observing complex nebular structures and stellar associations find it particularly noteworthy.
help Squid Nebula FAQ
Who discovered the Squid Nebula OU4?
French amateur astrophotographer Nicolas Outters discovered OU4 while imaging the region around Sh2-129 in 2011. Its designation uses his surname and identifies it as the fourth object in his catalogue.
Is the Squid Nebula inside the Flying Bat Nebula?
OU4 appears projected inside the red hydrogen-emission nebula Sh2-129, known as the Flying Bat Nebula. Research supports a physical association, but the Squid's exact origin has remained a subject of study.
Why does the Squid Nebula look blue in astrophotographs?
Its prominent signal comes from doubly ionized oxygen, captured through an OIII narrowband filter and commonly rendered blue-green. Sh2-129's hydrogen emission is usually mapped in red, making the squid shape stand out.
Can a beginner photograph OU4 with an ordinary camera?
OU4 is exceptionally faint and extends over more than one degree of sky, so it is a demanding deep-sky target. Successful images typically require a wide field, an OIII filter, dark skies, and many hours of exposure.
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