Sh1-118

An HII emission nebula in Cassiopeia with a confused identity crisis. It was in Stewart Sharpless's 1953 catalog as an emission nebula, but dropped from his second catalog as it was then believed to be a planetary nebula.  More recently it has been confirmed that it is NOT a planetary nebula.  It is 164 arc seconds in diameter.  It is estimated to be around 4,000 light years away, and around 3 light years across.
TARGET
Nomenclature: Sh1-118
Right Ascension: 00:07:20.20
Declination:  +64:57:20.74
Size: 164 arc seconds
EQUIPMENT USED
Twin APM TMB LZOS 152 refractors
10Micron GM2000 HPS mount
Twin QSI6120 CCD cameras
Astrodon filters
IMAGE CAPTURE
Blue: 17x300"
Green: 20x300"
Red: 20x300"
Ha: 157x900" bin 1x1
Total Integration: 44 hours
Pixel scale: 0.265 arcsec/pixel
Field radius: 0.175 degrees
Capture dates: 15-21 August 2022
Capture location:  Fregenal de la Sierra, Spain
IMAGE PROCESSING:
CCDStack and Photoshop CS2