About this Image
A supernova such as the one that resulted in Cassiopeia A is the explosive demise of a massive star that collapses under the weight of its own gravity.
The collapsed star then blows its outer layers into space in an explosion that can briefly outshine its entire parent galaxy.
Cas A is relatively young, estimated to be only about 340 years old.
16" cassegrain in secondary focus at f/10
|Camera||SBIG STL-11000M at -25C, internal filter wheel|
|Date||Oct 20 - Oct 21, 2008.|
|Sky Conditions||mag 5 sky, seeing 1.5-2", temperature 5-10 C|
|Exposure||L:R:G:B = 240:100:100:100 minutes (10-minute sub-exposures),|
Maxim DL 4.5;