| NOTES |
DATE:
|
Monday, June 6, 2011
|
TIME:
|
2:35 - 2:46 am EDT
|
CAMERA:
|
Canon 550D (Hutech modified)
|
EXPOSURE:
|
7 minutes (14 × 30 seconds) @ ISO 400 |
| LOCATION: |
Richard Township Park |
INSTRUMENT:
|
Celestron 9.25" EdgeHD Aplanatic Schmidt-Cassegrain (with Optec Lepus 0.62x Focal Reducer) |
| MOUNT: |
Celestron CGEM Computerized Mount |
| GUIDING: |
None |
PROCESSING:
|
Preprocessed, aligned, rotated, stacked, and dark frame subtracted with Nebulosity 2. Further processing done with
Adobe Photoshop CS3. |
COMMENTS:
|
The
Great Hercules Cluster (M13) is located 25,000 light-years away outside
the disk of the Milky Way Galaxy. It can be located about
2.5° south of Eta Herculis in the popular Keystone asterism in
Hercules. It can be spotted with the naked eye under excellent
conditions, but is an easy target with binoculars and a stunning sight
through most telescopes. The cluster itself is approximately 140
light-years in diameter and contains up to 1 million stars. Most
of the stars in M13 are classified as Population
II stars, meaning they're very old and metal poor (composed of
hydrogen and helium with few heavier elements).
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