- Description: The crab nebula is the visible cloud of expanding gas from a supernova, witnessed
by Chinese astronomers in 1054AD. To this day, material from that explosion is still expanding. I have aligned
two of my images, separated by just over 17 years. While there are some differences between the two pictures
(such as the number of stars) much of the detail is static. However, if you look at the outer edges of The Crab -
expecially at the lower left and upper right - you can see some changes in the size of the nebula. The outer
"tendrils" are clearly moving between between the two pictures.
- Camera 1: 35mm film camera
- Scope 1: 16" f4.5 Newtonian
- Filter 1: Lumicon hydrogen-alpha filter.
- Exposure 1: 45 minutes
- Location 1: suburbs of Calgary, Ab.
- Date 1: December 6, 1986
- Camera 2: SBIG ST-8
- Scope 2: 8" f9 Vixen VISAC flat-field Cassegrain
- Filter 2: Hutech Type II red filter.
- Exposure 2: 20 minutes binned 2x2
- Location 2: Wilson Coulee Observatory, Ab.
- Date 2: February 21, 2004