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NGC 7293 (Helix Nebula)


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NGC 7293
Planetary Nebula (惑星状星雲)
Helix Nebula (らせん星雲, 螺旋星雲)
Nb PN


別名 (Other names)
PK 36-57.1, ESO 602-PN22, Caldwell 63

明るさ (Brightness)
7.3等級

星座 (Constellation)
みずがめ座 (Aqr) (Aquarius)


距離 (Distance)
700光年 (700 light-years)

らせん星雲(NGC 7293、Caldwell 63)は、みずがめ座にある有名な惑星状星雲。

距離はおよそ700光年で、太陽系に最も近い惑星状星雲の1つ。
猫のような目の形をしている中心部が「らせん」の名前の由来であるが、最近の研究ではその周囲に淡い環状のガスが広がっていることがわかっている。
環状部まで含めると、全体の大きさは満月の約半分くらいまで広がっている。

NGC 7293 (Helix Nebula) is a planetary nebula located 700 light years from the Earth in the constellation Aquarius.

NGC 7293 (Helix Nebula) : Picture

Helix Nebula
The Helix Nebula from Blanco and Hubble
(C) C. R. O'Dell, (Vanderbilt) et al. ESA, NOAO, NASA
How did a star create the Helix nebula? The shapes of planetary nebula like the Helix are important because they likely hold clues to how stars like the Sun end their lives. Observations by the orbiting Hubble Space Telescope and the 4-meter Blanco Telescope in Chile, however, have shown the Helix is not really a simple helix. Rather, it incorporates two nearly perpendicular disks as well as arcs, shocks, and even features not well understood. Even so, many strikingly geometric symmetries remain. How a single Sun-like star created such beautiful yet geometric complexity is a topic of research. The Helix Nebula is the nearest planetary nebula to Earth, lies only about 700 light years away toward the constellation of Aquarius, and spans about 3 light-years.

NGC 7293 NGC 7293
NGC 7293
(C) NASA
NGC 7293
(C) NASA
NGC 7293 NGC 7293
NGC 7293
(C) NASA
NGC 7293
(C) NASA

NGC 7293 NGC 7293
NGC 7293
(C) NASA
NGC 7293
(C) NASA
NGC 7293 NGC 7293
NGC 7293
(C) NASA
NGC 7293
(C) NASA

NGC7293 NGC7293
NGC 7293
(C) NASA
NGC 7293
(C) NASA
NGC7293 NGC7293
NGC 7293
(C) NASA
NGC 7293
(C) Akira Fujii
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NGC 7293 (Helix Nebula) : Movie

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「ウィキペディア(wikipedia):フリー百科事典」より文章引用。
らせん星雲. (2012, December 15). In Wikipedia.
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