S 155, also known as the Cave Nebula, Sh2-155 or Caldwell 9, is a dim and very diffuse nebula within a larger nebula complex.
A Quick look at the Cave Nebula in Ha 17×1800″
moonrocksastro.com/index.php/astro-blog/
Frames: 17×1800″
Integration: 8.5 hours
Avg. Moon age: 16.49 days
Avg. Moon phase: 96.68%
RA center: 344.603 degrees
DEC center: 62.742 degrees
Pixel scale: 2.933 arcsec/pixel
Orientation: 179.445 degrees
Field radius: 1.668 degrees
Locations: Home observatory, Valencia, Spain
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