SH2-129 & OU4 HOO (Sergiy_Vakulenko)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: B152 · B354 · Sh2-129 · VdB140

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SH2-129 & OU4 HOO

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SH2-129 & OU4 HOO

Two years ago I tried to capture Ou4 with ED80. Even 30 min single exposure with O3 filter was unable to show presence of cosmic Squid. Well, I came back to it now.

Very faint but also very large on planet Earth’s sky, a giant Squid Nebula cataloged as Ou4, and Sh2-129 also known as the Flying Bat Nebula, are both caught in this scene toward the royal constellation Cepheus. Composed with a total of 20 hours of broadband and narrowband data, the telescopic field of view is almost 4 degrees or 8 Full Moons across. Discovered in 2011 by French astro-imager Nicolas Outters, the Squid Nebula’s alluring bipolar shape is distinguished here by the telltale blue-green emission from doubly ionized oxygen atoms. Though apparently completely surrounded by the reddish hydrogen emission region Sh2-129, the true distance and nature of the Squid Nebula have been difficult to determine. Still, a recent investigation suggests Ou4 really does lie within Sh2-129 some 2,300 light-years away. Consistent with that scenario, Ou4 would represent a spectacular outflow driven by HR8119, a triple system of hot, massive stars seen near the center of the nebula. If so, the truly giant Squid Nebula would physically be nearly 50 light-years across.

Sony 694 Images
Narrowband imaging
Sharpless2 Objects

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Status	Advanced success
Started	...
Astrometry.net job	3989542
PixInsight job	6ZLVOTNSQ63VZ1EHT3LZ9LWNWJQWVBA6
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h08m18s.26
RA (top/left)	21h20m58s.55
RA (top/right)	21h26m45s.28
RA (bottom/right)	20h53m25s.40
RA (bottom/left)	20h52m18s.12

Dec (center)	+60°01′09″.8
Dec (top/left)	+57°18′26″.1
Dec (top/right)	+62°17′10″.3
Dec (bottom/right)	+62°38′32″.10
Dec (bottom/left)	+57°37′09″.7

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SH2-129 & OU4 HOO

SH2-129 & OU4 HOO

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SH2-129 & OU4 HOO

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