SH2-188 - Planetary Nebula in Cassiopeia (rhedden)

SH2-188 - Planetary Nebula in Cassiopeia

Sharpless 2-188 is a planetary nebula in the constellation Cassiopeia that is sometimes called the Shrimp nebula. It is only about 850 lights years away, leading to its fairly large angular size of about 9 arcminutes. Nonetheless, it has low surface brightness and requires a lot of exposure.

This image is composed of mainly H-alpha data for luminance with (H+R)GB color palette using the Esprit 100ED + QHY 268M combination. After working up a preview, I realized there actually is some OIII emission, though it is quite faint. I broke out the C11 EdgeHD, which has been confined to the house since June when it started raining like the tropics, and I shot some 3 nm OIII data using 3x3 binning without the moon in the sky. It turns out that the C11 + QSI 660ws camera, binned 3x3, provides an image scale of 1.392” per pixel, whereas the Esprit + QHY rig has an image scale of 1.397” per pixel. What a coincidence. I barely had to resize the C11 data to combine it with the refractor data, which made things a bit easier.

The OIII signal from this PN is so weak compared to the H-alpha that I think it’s accurate to render it as solid red with lighter pink highlights where the OIII is strongest. One can stretch the OIII more aggressively to yield some blue-green highlights and obtain a more colorful image, but I decided not to go down that road. The RGB data suggested the whole nebula is light pink in color, but the RGB signal was so weak due to the faintness of the target that I ended up applying the HOO colors to the nebula.

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Status	Basic success
Started	...
Astrometry.net job	8723947
PixInsight job	n/a
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SH2-188 - Planetary Nebula in Cassiopeia

SH2-188 - Planetary Nebula in Cassiopeia

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SH2-188 - Planetary Nebula in Cassiopeia

SH2-188 - Planetary Nebula in Cassiopeia

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