OBJECT = M10 
TELESCOPE = 17.5 inch f4.5
CAMERA = ST7-E 
OBSERVER = Rusty Fletcher 
LOCATION = Seguin Outdoor Learning Center 
DATE (Yr-Mo-Dy) = 2004-04-15
TIME (UT) = 08:00:03
TOTAL EXPOSURE = 220 sec
IMAGES STACKED = 11


Globular Cluster M10 (NGC 6254) in Ophiuchus 

This 7th magnitude globular cluster is about 15.1 arc minutes in diameter, more than half the diameter of the full moon. At its distance of 16,000 light years, this corresponds to a linear diameter of 70 light years. Its bright core, however, is only little more than half as large. It is receding at 69 km/sec. 

According to Burnham an extremely low number of only 3 variables has been found in M10. The ``Catalog of Galactic Globular Clusters" of R. Monella of the Sharru Astronomical Observatory, COVO (Bergamo), Italy (ADC/CDS number VII, 103) gives the number of 4 variables. 


Right ascension 16 : 54.5 (hours : minutes)
Declination -04 : 02 (degrees : minutes)
Distance 16,000 light years
Visual magnitude6.7

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