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Giant Squid Nebula (Planetary Nebula)


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Giant Squid Nebula (ダイオウイカ星雲)
Planetary Nebula (惑星状星雲)
Nb PN


別名 (Other names)
Ou4

星座 (Constellation)
ケフェウス座 (Cep) (Cepheus)

距離 (Distance)
2,300光年 (2,300 light-years)

Giant Squid Nebula (Ou4) is a planetary nebula located 2,300 light years from the Earth in the constellation Cepheus.

Giant Squid Nebula (Planetary Nebula) : Picture

Ou4: A Giant Squid Nebula
Ou4: A Giant Squid Nebula
(C) Romano Corradi (IAC), Nicolas Grosso, Agnès Acker, Robert Greimel, Patrick Guillout
A mysterious, squid-like apparition, this nebula is very faint, but also very large in planet Earth's sky. In the mosaic image, composed with narrowband data from the 2.5 meter Isaac Newton Telescope, 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.

Giant Squid Nebula
Ou4: A Giant Squid Nebula
(C) Romano Corradi (IAC), Nicolas Grosso, Agnès Acker, Robert Greimel, Patrick Guillout
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