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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)

Technical card


Dates:Sept. 30, 2018Oct. 4, 2018

Frames:
Astronomik H-Alpha 6nm CCD: 28x900" -20C bin 1x1
Astronomik OIII 6nm CCD: 24x900" -20C bin 1x1

Integration: 13.0 hours

Darks: ~50

Flats: ~10

Bias: ~200

Avg. Moon age: 22.27 days

Avg. Moon phase: 48.86%

Bortle Dark-Sky Scale: 4.00


Astrometry.net job: 2416744

RA center: 1h 30' 4"

DEC center: +58° 28' 44"

Pixel scale: 0.928 arcsec/pixel

Orientation: -178.140 degrees

Field radius: 0.306 degrees


Resolution: 1848x1491

Locations: Home, Bergisches Land, Germany

Data source: Backyard

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.

Comments

Author

_Frank_
Frank Breslawski
License: Attribution-NonCommercial-ShareAlike Creative Commons
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Simeis 22 / SH2-188 - The Dolphin Nebula (Bicolor), 



    
        

            Frank Breslawski

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Narrowband imaging