# Great Globular Cluster in Hercules: Wikis

Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.

# Encyclopedia

(Redirected to Messier 13 article)

Messier 13

Messier 13 by Hubble Space Telescope; 3.3′ view
Credit: NASA/STScI/WikiSky
Observation data (J2000 epoch)
Class V
Constellation Hercules
Right ascension 16h 41m 41.44s[1]
Declination +36° 27′ 36.9″[1]
Distance 25.1 kly ()
Apparent magnitude (V) +5.8[1]
Apparent dimensions (V) 20 arcmins
Physical characteristics
Mass 1036 kg (6×105 [2] M${\odot}$)
Estimated age 1.4 × 1010 yr
Notable features one of the best
well-known clusters
of the northern
hemisphere
Other designations NGC 6205[1]

Messier 13 or M13 (also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster) is a globular cluster in the constellation of Hercules.

## Discovery and visibility

M13 was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.

It is located at right ascension 16h 41.7m and declination +36° 28'. With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear night. Its diameter is about 23 arc minutes and it is readily viewable in small telescopes. Nearby is NGC 6207, a 12th magnitude edge-on galaxy that lies 28 arc minutes directly north east. A small galaxy, IC 4617, lies halfway between NGC 6207 and M13, north-northeast of the large globular's center.

## Characteristics

M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is the variable star V11 with an apparent magnitude of 11.95. M13 is 25,100 light-years away from Earth.

## Arecibo message

The Arecibo message of 1974, designed to communicate the existence of human life to hypothetical extraterrestrials, was transmitted toward M13. The reason was that with a higher star density, the chances of a life harboring planet with intelligent life forms, were higher. Even though the message was transmitted, M13 will no longer be in that location when it arrives. The sending of the message was more of a technological demonstration, rather than an actual attempt to contact life.

## Literary references

M13 is in "armpit" of Hercules constellation

## References

1. ^ a b c d "SIMBAD Astronomical Database". Results for NGC 6205. Retrieved 2006-11-15.
2. ^ Leonard, Peter J. T.; Richer, Harvey B.; Fahlman, Gregory G.. "The mass and stellar content of the globular cluster M13".
3. ^ distance × sin( diameter_angle / 2 ) = 84 ly. radius