 |
Home > Astrophotography > M13
|
| Object: | M13, the Great Globular Cluster in Hercules |
| Date: | 9/22/2006 |
| Site: | Palo Alto, CA |
| Condition: | Clear sky, 60 °F |
| Optics: | C9.25 with Taurus Tech RLS F6.5 reducer |
| Filters: | none |
| Camera: | Nikon D50, NR off |
| Exposure/ISO: | 10 exposures (total 30 minutes) @ ISO 800 |
| Processing: | Photoshop: LFF calibration, stacked in KIS 4.2, levels, sharpened lightly with FocusFixer. |
| Comments: | M13 lies about 25,000 light-years away. It is one of the largest globular clusters and contains probably a million or so stars. As you can see, it is difficult to get an exact star count. Globular clusters are peculiar structures. Not only is it unusual to see such densely packed stars, these clusters seem to be precisely placed in a halo around the center of our galaxy. See discussions in Wikipedia SEDS-LPL |