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Hercules Cluster
(2013-10-01 21:10)


About this Object

The Great Globular Cluster in Hercules, or the Hercules Globular Cluster, is also known as Messier object M13. It is a globular cluster of about 300,000 stars in the constellation of Hercules. With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear and dark night. Its diameter is about 23 arc minutes and it is readily viewable in small telescopes. M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars. This cluster is 25,100 light-years away from Earth.

About this Image

This image was captured on Oct 1, 2013, the first day of Doug Biernacki's retirement. I selected this object because Doug's email identify includes M13.


--- Date/Time ---
Local: 2013-10-01 21:10:00
UTC: 2013-10-02 01:10:00

--- Location ---
The Ashton Observatory at Johnson Farms, Ashton MD
(Latitude N39.15°, Longitude W77.01°, Elevation 510')

--- Conditions ---
Temperature: 64° Dew Point: 82° Humidity: 58% Medium seeing

--- Optics ---
Televue NP101is 101mm f/5.35 Refractor with Televue 2x PowerMate

--- Camera ---
Canon EOS 60Da

--- Exposure ---
Qty 12 75-second ISO 2500

--- Post-Processing ---
RegiStax, PhotoShop



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