Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)
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Sh2-188 The Dolphin, Jens Andersen Dolmer
Sh2-188 The Dolphin
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Sh2-188 The Dolphin

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Sh2-188 The Dolphin, Jens Andersen Dolmer
Sh2-188 The Dolphin
Powered byPixInsight

Sh2-188 The Dolphin

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Description

Sh2-188 is also cataloged as Simeis 22, and the common names of this nebula are Dolphin or Shrimp. The diameter of the brightest arc is about 10 arc minutes, that is 1/3 of the apparent diameter of the Moon. But the nebula itself is quite faint, even its brightest part.
The asymmetric shape of Sh2-188 is explained by the interaction of the rapidly moving planetary nebula with the interstellar medium. As a result, the bow shock is preserved in the direction of forward motion, but the back end of the planetary nebula dissipates in space. Sh2-188 is considered to be one of the most extreme examples of planetary nebula and interstellar medium interaction.

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Sh2-188 The Dolphin, Jens Andersen Dolmer