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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/5 Astro-Physics EDF Refractor with AP Telecompressor. TMB Triplet Apo 80 mm f/6 for guiding |
| Mount |
Astro-Physics AP 900GTO |
| Camera | SBIG ST-10XME. With a Remote Guiding Head. |
| Filters | SBIG CFW9. Astrodon LRGB filters. Baader-Planetarium 7 nm Ha,SII,OII, filters |
| Focuser | Robofocus focuser and Focusmax software |
| Dates | June 2009. |
| Location | Lentin Observatory |
| Exposure | RGB =R=34X2:G=32X2:B=38X2 minutes.bin1.-18°c. Scale= 2.14^s/pixel. total time 3h28 |
| Acquisition | All data's were acquired unattended with ACP Observatory Control Software V5 DC3 Dreams and MaxIm DL 5, including sky flats , |
| Processing | MaxIm DL 5, PixInsight 1.4, Photoshop CS4. |
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Click here to look at my 2007 M13 previous attempt. | |
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Antoine Vergara