The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22 (Steven Bellavia)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas)

The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22, Steven Bellavia

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The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22

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The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22

The Dolphin Nebula, Sh2-188, PNG128.0-4.1 and Simeis22, in the constellation Cassiopeia, is a planetary nebula. It is approximately 850 light years from Earth

It is estimated to be around 7,500 years old. Although it is actually circular, it is much brighter to the southwest because the star that is energizing the nebula is moving rapidly in that direction. Another thing that makes this planetary nebula a little unusual is how red it is, due to glowing hydrogen. Many other planetary nebulae have teal or blue in them due to oxygen atoms.

Sh2-188 is an example of strong interaction between a planetary nebula (PN) and the interstellar medium (ISM). It shows a single arc-like structure, consisting of several filaments, which is postulated to be the result of motion through the ISM.

Imaged with APT

Planetary Nebulae

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22

The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22

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The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22

The Dolphin Nebula, Sh2-188, PNG128.0-4.1, Simeis 22

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