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Michael A. Stecker
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Berkeley 17
The Berkeley-17 open or galactic star cluster is found about 3 degrees south of emission nebula IC 410 and 7 degrees west of SNR Simeis-147 in the constellation Auriga. It is about 13 arcminutes in diameter and is very faint. Its age is estimated at 9 billion years making it by far the oldest open cluster yet seen. It is unusual for a galactic cluster to achieve this age because of mixing and dispersing within the galactic disk.
Photographic Data:
An Astro-Physics 155-mm f/7 EDF refractor and 35 mm
camera were used with
hypersensitized Kodak Pro 400 PPF film. A single 40-minute exposure was made while centering at RA 05 hrs, 20.5 min and Declination +30.5 degrees. The cluster size is 13' in diameter. The image was processed in the computer. .
references:
The Cambridge Encyclopedia of Stars by James Kaler, 2006, page 172 http://adsabs.harvard.edu/abs/astro-ph/9812278 http://www.aas.org/publications/baas/v36n5/aas205/213.htm http://www.journals.uchicago.edu/cgi-bin/resolve?id=doi:10.1086/304272 |
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