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IRAS 19024+0044 (Protoplanetary Nebula)


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IRAS 19024+0044
Protoplanetary Nebula (原始惑星状星雲)
Nb PPN

別名 (Other names)
PN PM 2-39, GLMP 870, OH 35.21 -2.65

距離 (Distance)
11,000光年 (11,000 light-years)

星座 (Constellation)
わし座 (Aql) (Aquila)

IRAS 19024+0044 is a protoplanetary nebula 11,000 light years from the Earth in the constellation Aquila.

IRAS 19024+0044 (Protoplanetary Nebula) : Picture

IRAS 19024+0044 (Protoplanetary Nebula)
IRAS 19024+0044 (Protoplanetary Nebula)
(C) ESA/Hubble, NASA and R. Sahai
In the constellation of Aquila, lies a star nearing the end of its life that is surrounded by a starfish-shaped cloud of gas and dust. A striking image of this object, known as IRAS 19024+0044 has been captured by the NASA/ESA Hubble Space Telescope.

Protoplanetary nebulae offer glimpses of how stars similar to the Sun end their lives and how they make the transition to white dwarfs surrounded by planetary nebulae. As it ages, a Sun-like star eventually sheds its outer layers into space, creating a beautiful and often intricately shaped cloud of gas and dust around it. At first, still relatively cool, the star is unable to ionise this gas, which shines only by reflected and scattered stellar light. Only when the temperature of the star increases enough to ionise this protoplanetary nebula does the pattern of gas and dust become a fully fledged planetary nebula.

Protoplanetary nebulae are relatively rare and short-lived objects that provide astronomers with clues into how the often strangely asymmetric planetary nebulae are formed. Clearly visible in this image are five blue lobes that extend away from the central star and give the nebula its asymmetric starfish shape. While astronomers have come up with theories for the origin of these structures, such as direction-changing jets or explosive ejections of matter from the star, their formation is not entirely understood.

IRAS 19024+0044 is blue in colour as the blue component of the light coming from the star is more easily scattered by the gas and dust in the nebula, while the red and orange rays are relatively unaffected. This is similar to what happens to sunlight in the Earth’s atmosphere, giving the sky its distinctive shade of blue.

IRAS 19024+0044 (Protoplanetary Nebula)
IRAS 19024+0044 (Protoplanetary Nebula)
(C) NASA/ESA/Hubble
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