|
|
||
|
|
||
|
|
The famous double cluster in Perseus. The two clusters are at a distance of 7600 light years (NGC 869) and 6800 light years (NGC 884). These two clusters are therefore close together in space - this is not just a chance line of sight effect. The two clusters collapsed from the same gas cloud. The two clusters are also very young - 5.6 million years (NGC 869) and 3.2 million years (NGC 884). On an astronomical time scale this is very young. For example, the Pleiades star cluster is some where between 75 and 150 million years old. The two clusters are approaching us at 22km/s and 21km/s respectively. The brightest main sequence stars in these two clusters have a spectral type of B0.
Full
size negative image (1 Megabyte)
| Date | 11th October 2008 |
| Telescope | 250mm F4.8 Newtonian Reflector with MPCC coma corrector |
| Filter | Red |
| Exposure (seconds) |
Mosaic of 3 tiles of 30 x 30seconds |
| Software | CCDstack, IRIS |
| Image Scale | Raw frames at 1.1 arc seconds per pixel |
