M51 – The Whirlpool Galaxy
by Mike Hankey, under Galaxies
Here’s a photo I took from my observatory of Messier 51, the famous Whirlpool Galaxy.
At an estimated 23 million light years away, M51 is one of the most famous galaxies in the sky and a popular target for amateur astronomers. M51 is an interacting, grand-design, spiral galaxy. Interacting means, the galaxy is merging with another galaxy resulting in a disturbance of both galaxies because the gravitational fields of each are ‘interacting’ with each other. Grand-design is a designation for a special type of spiral galaxy that has prominent, well defined continuous spiral arms. Less than 10% of all spiral galaxies are designated grand-design.
Earlier this year in June 2011, a super nova was discovered inside M51 bringing renewed attention to the galaxy. I don’t think the supernova is still visible in last night’s image. I did look to see if it was there though.
Happy New Year!
Astro Photo Details
30 minutes RGB & 60 minutes of L / 150 total minutes (2.5 hours)
SBIG ST8300 Camera
MMOAG & SBIG 402 Guide Camera
Paramount ME Mount
RCOS 14.5
The Sky X / CCDStack / CCDSoft