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NGC 2440 (Planetary Nebula)


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NGC 2440
Planetary Nebula (惑星状星雲)
Nb PN


別名 (Other names)
PK 234+2.1, ESO 560-PN9

明るさ (Brightness)
9.4等級

星座 (Constellation)
とも座 (Pup) (Puppis)


距離 (Distance)
4,000光年 (4,000 light-years)

NGC 2440 is a planetary nebula located 4,000 light years from the Earth in the constellation Puppis.

NGC 2440 (Planetary Nebula) : Picture

Planetary Nebula NGC 2440
Planetary Nebula NGC 2440
(C) NASA
Planetary nebula NGC 2440 has an intriguing bow-tie shape in this stunning view from space. The nebula is composed of material cast off by a dying sun-like star as it enters its white dwarf phase of evolution. Details of remarkably complex structures are revealed within NGC 2440, including dense ridges of material swept back from the nebula's central star. Near the center of the view, the star itself is one of the hottest known, with a surface temperature of about 200,000 kelvins. About 4,000 light-years from planet Earth toward the nautical constellation Puppis, the nebula spans over a light-year and is energized by ultraviolet light from the central star. The false-color image was recorded earlier this month using the Hubble's Wide-Field Planetary Camera 2(WFPC2), demonstrating still impressive imaging capabilities following the failure of the Advanced Camera for Surveys.

NGC 2440: Cocoon of a New White Dwarf
NGC 2440: Cocoon of a New White Dwarf
(C) NASA
Like a butterfly, a white dwarf star begins its life by casting off a cocoon that enclosed its former self. In this analogy, however, the Sun would be a caterpillar and the ejected shell of gas would become the prettiest of all! In the above cocoon, the planetary nebula designated NGC 2440, contains one of the hottest white dwarf stars known. The white dwarf can be seen as the bright dot near the photo's center. Our Sun will eventually become a white dwarf butterfly but not for another 5 billion years. The above false color image was post-processed by Forrest Hamilton.

NGC2440 NGC2440
NGC 2440
(C) NASA
NGC 2440
(C) NASA
NGC2440 NGC2440
NGC 2440
(C) NASA
NGC 2440
(C) NASA
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NGC 2440 (Planetary Nebula) : Movie

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