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Contains:  M 13, Great Cluster in Hercules, NGC 6205
Getting plate-solving status, please wait...

M13 Hercules Globular Cluster

Technical card

Resolution: 4656x3472

Dates:May 29, 2019

Astrodon Gen 2 L 36mm: 252x40" (gain: 99.00) -15C bin 1x1
Astrodon Gen 2 RGB 36mm: 200x40" (gain: 99.00) -20C bin 1x1

Integration: 5.0 hours

Avg. Moon age: 24.68 days

Avg. Moon phase: 24.33%

Bortle Dark-Sky Scale: 4.00

Temperature: 10.00 job: 2725393

RA center: 250.421 degrees

DEC center: 36.455 degrees

Pixel scale: 0.701 arcsec/pixel

Orientation: 177.616 degrees

Field radius: 0.565 degrees

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Images from the following two scopes (piggybacked) contributed to this image:
AG12+ASI1600MM at .70 asec/pix
TV127is+ASI183MM at .75 asec/pix.
They were all registered to the best R image taken on the AG12.
Using L from the TV NP127is refractor effectively eliminates the spikes from the AG12.

M13 was discovered by Edmond Halley in 1714, and cataloged by Charles Messier on June 1, 1764 into his list of objects not to mistake for comets; Messier's list, including Messier 13, eventually became known as the Messier Catalog.

Traditional binoculars make the Hercules Globular Cluster look similar to a round patch of light. At least four inches of telescope aperture will allow observing the stars that constitute M13 as small pinpoints of light. However, only larger telescopes allow resolving stars further into the center of the cluster. For this image, both the 12" Newtonian and the 5" refractor are able to resolve stars in the center of the cluster.

M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is a red giant, the variable star V11, with an apparent visual magnitude of 11.95. M13 is about 22,200 light-years away from Earth.

It wasn't until 1779 that the single stars in this globular cluster were resolved. Compared to the stars in the neighborhood of the Sun, the stars in M13's stellar population are more than a hundred times denser. They are so densely packed together that they sometimes collide and produce new stars. The newly-formed, young stars, so-called "blue stragglers," are particularly interesting to astronomers.

The Arecibo message of 1974, which contained encoded information about the human race, DNA, atomic numbers, Earth's position and other information, was beamed from the Arecibo Observatory radio telescope towards M13 as an experiment in contacting potential extraterrestrial civilizations in the cluster. The cluster will move through space during the transit time; opinions differ as to whether or not the cluster will be in a position to receive the message by the time it arrives.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


M13 Hercules Globular Cluster, 


            Jerry Macon