Globular Cluster Messier 107

Messier 107
Messier 107: Image taken with Hubble Space Telescope [215]


The globular cluster M 107 was discovered by Pierre Méchain in April 1782. He mentioned his discovery in his letter of May 6, 1783 to Bernoulli. Unfortunately, his discovery came after Messier submitted his list of for publication in the 1784 Connoissance des Temps. The nebula might have been included in a later publication of Messier's catalog, but there was none. Wilhelm Herschel discovered this globular cluster independently and was able to resolve it into individual stars in his telescope. Dreyer later included this as NGC 6171 in his «New General Catalogie of Nebulae and Star Clusters» published in 1888. It was not until 1947 that Helen Sawyer identified Hogg NGC 6171 with Méchain's discovery and added it to the Messier catalog as M 107 together with M 105 and M 106. [196, 217]

Physical Properties

M 107 is one of the more than 150 globular clusters that belong to our Milky Way. The center is not particularly densely packed with stars. It is around 6.4 kpc (20'000 light years) from Earth and contains 182'000 solar masses. [251]

«Revised New General Catalogue and Index Catalogue» Dr. Wolfgang Steinicke, 2021 [277]
DesignationNGC 6171
TypeGCL (X)
Right Ascension16h 32m 31.9s
Declination-13° 03' 11"
Diameter13.00 arcmin
Visual magnitude7.8 mag
Dreyer Descriptionglobular, L, vRi, vmC, R, rrr
IdentificationM 107, GCL 44

Finder Chart

M 107 is located in the constellation Ophiuchus (Serpent Bearer) 2 ° 45 'from ζ Ophiuchi. The best observation time is May to July.

Chart M 107
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]


149SkySafari 6 Pro, Simulation Curriculum;
160The STScI Digitized Sky Survey;
196Celestial Atlas by Curtney Seligman; (2020-12-28)
215Explore - The Night Sky | Hubble’s Messier Catalog; (2020-12-31)
217The Messier Catalog (SEDS); (2021-01-01)
251«Young Radio Pulsars in Galactic Globular Clusters» Jason Boyles, Duncan R. Lorimer, Phil J. Turk, Robert Mnatsakanov, Ryan S. Lynch, Scott M. Ransom, Paulo C. Freire, Khris Belczynski; The Astrophysical Journal, Volume 742, Number 1; DOI:10.1088/0004-637X/742/1/51
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; (2021-02-17)