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The great Hercules Globular Cluster
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Click on image for a larger view
The great Hercules Globular Cluster
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| M13, also called the `Great globular cluster' in Hercules, is one of the most prominent and best known globulars of the Northern celestial hemisphere. It was discovered by Edmond Halley in 1714. At its distance of 25,100 light years, its angular diameter of 20' corresponds to a linear 145 light years - visually, it is perhaps 13' large. It contains several 100,000 stars; Timothy Ferris in his book Galaxies even says "more than a million". The age of M13 has been determined by Sandage as 24 billion years and by Arp as 14 billion years. More informations are available at the seds.org website |
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| Optics |
130 mm f/6.2 Astro-Physics EDF Refractor |
| Mount |
Astro-Physics AP 900GTO |
| Camera | SBIG ST-10XE. |
| Filters | SBIG CFW8A.With Astrodon LRGB Ha filters |
| Focuser | Robofocus focuser and Focusmax software |
| Dates | July 2007. |
| Location | Lentin Observatory |
| Exposure | LRGB = 333:140:120:155 minutes.bin1. Scale 1.7^s/pixel |
| Acquisition | All data's were acquired unattended with ACP Observatory Control Software V5 DC3 Dreams and MaxIm DL 4, including sky flats , |
| Processing | MaxIm DL 4, Photoshop CS2. |
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Click here to look at my 2006 M13 previous attempt. | |
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Antoine Vergara
