Abell 31 is an enormous planetary nebula about 2000 light-years away in Cancer. The turquoise glow comes from oxygen gas, while the red shell traces hydrogen expanding into interstellar space.
This extremely faint nebula required 31 hours of exposure time to reveal its full structure.
Equipment: RC10 telescope (254 mm)
QSI 660 WSG-8 CCD
Total integration: 31.2 hours
Location: Fregenal de la Sierra, Spain
by kbarth001
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