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NGC 5882 (Planetary Nebula)


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NGC 5882
Planetary Nebula (惑星状星雲)
Nb PN

別名 (Other names)
IC 1108, PK 327+10.1, ESO 274-7, IRAS 15134-4527

明るさ (Brightness)
9.4等級

星座 (Constellation)
おおかみ座 (Lup) (Lupus)


距離 (Distance)
7,000光年 (7,000 light-years)

NGC 5882 is a planetary nebula located 7,000 light years from the Earth in the constellation Lupus.

NGC 5882 (Planetary Nebula) : Picture

NGC 5882 (Planetary Nebula)
NGC 5882 (Planetary Nebula)
(C) NASA/ESA
Planetary nebulae signal the demise of mid-sized stars (up to about eight times the mass of the Sun); when the star’s hydrogen fuel supply is exhausted, its outer layers expand and cool, creating a cocoon of gas and dust. This gas then glows as it is bathed in the strong ultraviolet radiation from the central star. NGC 5882 is a quite bright, but small, example of a planetary nebula that lies deep in the southern Milky Way in the constellation of Lupus.

Planetary nebulae sometimes have a perfectly symmetrical appearance, with gas being bellowed out from the dying star evenly in every direction. However, this isn’t the case for NGC 5882, as this Hubble image shows. It appears to have two distinct, but non-uniform regions: an elongated inner shell of gas and a fainter aspherical shell that surrounds it.

Hubble’s sharp view reveals the intricate knots, filaments and bubbles within these shells. But it’s the dying star at the heart of the planetary nebula that dominates the image, shining brightly with an incredible surface temperature of about 70,000 degrees Celsius. (For comparison, the surface temperature of the Sun is only about 5,500 degrees Celsius.) The high surface temperature of this white dwarf is a result of the star’s struggle for survival, finding new ways to prevent itself from collapsing under its own gravity.

NGC 5882 (Planetary Nebula)
NGC 5882 (Planetary Nebula)
(C) NASA/ESA

NGC 5882: A Small Planetary Nebula
NGC 5882: A Small Planetary Nebula
(C) H. Bond, HST, STSci, NASA
Will most stars one day look like this? Pictured above is the planetary nebula NGC 5882, captured by the Hubble Space Telescope. Although planetary nebulae can appear similar to planets like Uranus and Neptune, they are actually gas clouds surrounding stars typically hundreds of light years away. Planetary nebula form when a typical star completes fusion in its core and ejects an outer envelope of gas - usually about 10 percent of the star's initial mass. This gas shell dims in about 50,000 years - short compared to the lifetimes of stars. Therefore, although only about 1,000 planetary nebula are known in our Galaxy, it is thought that most stars go through this phase. Green light is emitted when oxygen ions acquire electrons from the surrounding gas.

NGC 5882 (Planetary Nebula) NGC 5882 (Planetary Nebula)
NGC 5882 (Planetary Nebula)
(C) NASA/ESA
NGC 5882 (Planetary Nebula)
(C) NASA/ESA
NGC 5882
NGC 5882: A Small Planetary Nebula
(C) H. Bond, HST, STSci, NASA
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