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NGC 7822 (Emission Nebula)


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NGC 7822
Emission Nebula (散光星雲)
Nb EN


別名 (Other names)

LBN 583, CED 214A

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

距離 (Distance)
3,000光年 (3,000 light-years)

NGC 7822 is an emission nebula located 3,000 light years from the Earth in the constellation Cepheus.

NGC 7822 (Emission Nebula) : Picture

NGC 7822
Stars and Dust Pillars in NGC 7822 from WISE
Image Credit: WISE, IRSA, NASA; Processing & Copyright : Francesco Antonucci
Hot, young stars and cosmic pillars of gas and dust seem to crowd into NGC 7822. At the edge of a giant molecular cloud toward the northern constellation Cepheus, this glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and complex dust sculptures dominate this detailed skyscape taken in infrared light by NASA's Wide Field Infrared Survey Explorer (WISE) satellite. The atomic emission by the cluster's gas is powered by energetic radiation from the hot stars, whose powerful winds and light also sculpt and erode the denser pillar shapes. Stars could still be forming inside the pillars by gravitational collapse, but as the pillars are eroded away, any forming stars will ultimately be cut off from their reservoir of star stuff. This field spans around 40 light-years at the estimated distance of NGC 7822.

NGC 7822
NGC 7822 in Cepheus
(C) Manuel Fernández Suarez

NGC 7822
NGC 7822 in Cepheus
(C) Neil Fleming

NGC 7822
NGC 7822 in Cepheus
(C) Don Goldman

Sharpless 171
The Star Pillars of Sharpless 171
(C) Nicolas Outters (Observatoire d'Orange)
Towering pillars of cold gas and dark dust adorn the center star forming region of Sharpless 171. An open cluster of stars is forming there from the gas in cold molecular clouds. As energetic light emitted by young massive stars boils away the opaque dust, the region fragments and picturesque pillars of the remnant gas and dust form and slowly evaporate. The energetic light also illuminates the surrounding hydrogen gas, causing it to glow as a red emission nebula. Pictured above is the active central region of the Sharpless 171 greater emission nebula. Sharpless 171 incorporates NGC 7822 and the active region Cederblad 214, much of which is imaged above. The area above spans about 20 light years, lies about 3,000 light years away, and can be seen with a telescope toward the northern constellation of Cepheus.

NGC 7822 Sharpless 171
NGC 7822
(C) NASA
Sharpless 171
(C) Nicolas Outters
NGC 7822 NGC 7822
NGC 7822
(C) Manuel Fernández Suarez
NGC 7822
(C) Don Goldman
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