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Globular Cluster in Hercules
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Click on image for a larger view
Globular Cluster in Hercules
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| Globular cluster M92 is one of the original discoveries of Johann Elert Bode, who found it on December 27, 1777. Charles Messier independently rediscovered it and cataloged it on March 18, 1781, the same day as he cataloged another 8 objects, all of them Virgo Cluster galaxies (M84-M91). It was William Herschel who first resolved it into stars in 1783.
According to newer sources, M92 is about 26,000 light years distant, only little more than its brighter apparent neighbor M13. From its HRD (or CMD), it may be a bit younger than M13 as its turnoff point is shifted to the brighter and bluer end. A semi-recent estimate of M92's age has given a value of about 16 billion years (anyway more than 14 billion years).
More informations are available at the seds.org website |
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| Optics |
130 mm f/12.6 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 | 30 May 2006. |
| Location | Lentin Observatory |
| Exposure | L=60mn bin1 RGB=36:36:36 minutes.bin2. Scale 0.85^s/pixel |
| Acquisition | All data's were acquired unattended with ACP Observatory Control Software V4 DC3 Dreams and MaxIm DL 4, including sky flats, |
| Processing | MaxIm DL 4, Photoshop CS, Registar, Neat Image. |
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Antoine Vergara