Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  PK128-04.1  ·  Sh2-188
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Simeis 22 / SH2-188 - The Dolphin Nebula (Bicolor), Frank Breslawski
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Simeis 22 / SH2-188 - The Dolphin Nebula (Bicolor)

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Simeis 22 / SH2-188 - The Dolphin Nebula (Bicolor), Frank Breslawski
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Simeis 22 / SH2-188 - The Dolphin Nebula (Bicolor)

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Description

Simeis 22 (aka Sharpless 188, SH2-188 and the Dolphin Nebula) is an unusual planetary nebula in the galactic disk, approximately 850 light-years away from earth in the northern constellation of Cassiopeia.

I spent around 13 hours for collecting H-Alpha and OIII data for this bicolor. Definitely a nebula for which the term "faint fuzzy" was probably created. ;-) Found some more very interesting facts about Simeies 22:

The expanding gas from SH2-188 has a nearly circular shape, but is much brighter to the southeast (lower left). This is because the rapidly moving central star – at about125 km/s – is s creating a bow shock in that direction in the surrounding interstellar medium. Faint wisps of gas can also be seen in the opposite direction, which will eventually dissipate away. SH2-188 is considered to be one of the best examples of interaction between a planetary nebula with the interstellar medium.

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Simeis 22 / SH2-188 - The Dolphin Nebula (Bicolor), Frank Breslawski

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Narrowband imaging