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Abell 7 (Planetary Nebula)


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Abell 7
Planetary Nebula (惑星状星雲)
Nb PN


別名 (Other names)
PK 215-30.1, PN G215.5-30.8

星座 (Constellation)
うさぎ座 (Lep) (Lepus)


距離 (Distance)
1,800光年 (1,800 light-years)

Abell 7 is a planetary nebula located 1,800 light years from the Earth in the constellation Lepus.

Abell 7 (Planetary Nebula) : Picture

Planetary Nebula Abell 7
Planetary Nebula Abell 7
(C) Don Goldman
Very faint planetary nebula Abell 7 is some 1,800 light-years distant, just south of Orion in planet Earth's skies in the constellation Lepus, The Hare. Surrounded by Milky Way stars and near the line-of-sight to distant background galaxies, its generally simple spherical shape, about 8 light-years in diameter, is outlined in this deep telescopic image. Within its confines are beautiful, more complex details enhanced by the use of narrowband filters. Emission from hydrogen and nitrogen is shown in reddish hues with oxygen emission mapped to a bluish-green color, giving Abell 7 a more natural appearance that would otherwise be much too faint to be appreciated by eye. A planetary nebula represents a very brief final phase in stellar evolution that our own Sun will experience 5 billion years hence, as the nebula's central, once sun-like star shrugs off its outer layers. Abell 7 itself is estimated to be 20,000 years old. Its central star is seen here as a fading white dwarf some 10 billion years old.

Planetary Nebula Abell 7
Planetary Nebula Abell 7
(C) Don Goldman
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Abell 7 (Planetary Nebula) : Movie

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