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Contains:  NGC 6207, M 13, Great Cluster in Hercules, NGC 6205
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            John R Carter, Sr.


Technical card

Imaging telescope or lens:Celestron 14" EdgeHD

Imaging camera:ZWO ASI128MC Pro

Mount:Losmandy Titan 50

Focal reducer:Starizona HyperStar

Software:sharpcap 3.1 proPixInsight

Resolution: 2048x1363

Dates:July 7, 2018

Frames: 93x5" -14C

Integration: 0.1 hours

Darks: ~20

Flats: ~50

Bias: ~100

Avg. Moon age: 23.31 days

Avg. Moon phase: 37.78% job: 2303288

RA center: 250.247 degrees

DEC center: 36.683 degrees

Pixel scale: 5.110 arcsec/pixel

Orientation: 278.756 degrees

Field radius: 1.746 degrees

Locations: Paulden, Paulden, AZ, United States

Data source: Backyard


(Description from SkySafari 6 Pro)
Messier 13, also designated NGC 6205, and sometimes called the Great Hercules Cluster, is considered the most spectacular globular cluster in northern skies.

The Great Hercules Cluster was discovered by Edmond Halley in 1714, who noted that "it shows itself to the naked eye when the sky is serene and the Moon absent." Fifty years later it was examined by Charles Messier, who cataloged it in 1764. M 13 is also reported in John Bevis' Celestial Atlas. In 1787, Sir William Herschel pronounced it "a most beautiful cluster of stars, exceedingly compressed in the middle, and very rich."

At magnitude 5.8, M 13 is barely visible to the naked eye on very dark nights. It appears about 1/3 of the distance from Eta to Zeta Herculis, the two western (leading) stars in the Keystone asterism of Hercules. Even small telescopes resolve it into an extensive, magnificent mass of stars, perhaps 13' across visually. Observers note four apparently star-poor regions. The faint, 11th-magnitude galaxy NGC 6207 lies nearby, about 28' to the north east, and is visible in many wide-field photographs of M 13.



John R Carter, Sr.
License: None (All rights reserved)

Sky plot

Sky plot




            John R Carter, Sr.