By Christoph Stopka | 2025-10-09
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Ghosts in the sky for Halloween
On 10/13/2025 04:00 am by Marcy Curran | Cheyenne, Wyoming
"Ghosts of Cassiopeia" refers to IC 63 (middle) and IC 59 (lower left), a pair of emission and reflection nebulae located 550 light-years away in the constellation Cassiopeia. Their ghostly glow is caused by ultraviolet radiation from the nearby blue-giant star Gamma Cassiopeiae (upper left), which ionizes the hydrogen gas and causes it to glow red, while also reflecting off dust that appears blue. They are called "ghosts" because of their wispy, spectral appearance.
William-Optics FLT91
Ogma AP26CC Camera
Paramount MyT mount
255 minutes of 3-minute exposures that were stacked and processed in Pixinsight.