Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)
Abell 39, PolarisB
Abell 39
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Abell 39, PolarisB
Abell 39
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Description

This is Abell 39, a planetary nebula in the constellation Hercules. The nebula fascinates because it is almost perfectly spherical. Like all planetary nebulae, Abell 39 is the remains of a dying star. The dying star is the central star within the nebula. The sphere glows in this image primarily in the light of oxygen excited by the radiation from the central star.

Exposure times for this image were as follows: 12nm OIII: 31x1200" combined in RGB with R (14x300"), G (15x300" + 90% OIII), B (15x300" + 20% OIII). All filters are Astronomik.

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Abell 39, PolarisB