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{{Infobox globular cluster
| name = Messier 107
| image =
| caption = M107 from Hubble Space Telescope; 3.5′ view
| credit = NASA/STScI/WikiSky
| epoch = J2000
| class = X[1]
| constellation name= Ophiuchus
| ra = {{RA|16|32|31.86}}[2]
| dec = {{DEC|–13|03|13.6}}[2]
| dist_ly = {{Convert|20.9|kly|kpc|abbr=on|lk=on}}[4]
| appmag_v = +8.85[5]
| absmag_v =
| size_v = {{Val|10|ul=arcminute}}
| mass_msol = {{Val|1.82|e=5}}[4]
| radius_ly = 30 ly[1]
| radius_tidal_ly =
| metal_fe = –0.95[9]
| age = 13.95 Gyr[9]
| names = C 1629-129, GCl 44, M 107, NGC 6171[5]
}}Messier 107 or M107, also known as NGC 6171, is a very loose globular cluster in the constellation Ophiuchus, and is the last globular cluster in the Messier Catalogue. It was discovered by Pierre Méchain in April 1782, then independently by William Herschel in 1793. Herschel described it as a "globular cluster of stars, large, very rich, very much compressed, round, well resolved, clearly consisting of stars".[ It was not until 1947 that Helen Sawyer Hogg added it and three other objects discovered by Méchain to the list of Messier objects.[13] The cluster is located 2.5° south and slightly west of the star Zeta Ophiuchi.]M107 is close to the galactic plane at a distance of about 20,900 light-years from Earth[4] and {{Convert|3.0|kpc|kly|order=flip|abbr=on|lk=off}} from the Galactic Center.[16] The orbit of this cluster carries it through the galaxy between {{Convert|2.82|–|3.79|kpc|kly|order=flip|abbr=on|lk=off}} from the Galactic Center, with the perigalactic distance laying within the galactic bar region.[17] It is an Oosterhoff type I[18] cluster with a metallicity of –0.95[9] and is considered part of the halo population.[16] There are 22 known RR Lyrae variable stars in this cluster and a probable SX Phoenicis variable.[21] GalleryReferences1. ^From trigonometry: distance × {{nowrap|sin( diameter_angle / 2 )}} = 39.5 ly. radius
2. ^1 {{citation | first1=Hartmut | last1=Frommert | first2=Christine | last2=Kronberg | title=Messier 107 | work=SEDS Messier pages | publisher=Students for the Exploration and Development of Space (SEDS) | date=August 30, 2007 | url=http://www.messier.seds.org/m/m107.html | accessdate=2018-12-07 | postscript=. }}
3. ^1 {{citation | contribution=Variable Stars in the Globular Cluster M107: The Discovery of a Probable SX Phoenicis | last1=McCombs | first1=Thayne | last2=Reinhart | first2=E. | last3=Murphy | first3=B. W. | display-authors=1 | title=AAS Meeting #221 | volume=221 | pages=250.22 | id=250.22 | date=January 2013 | publisher=American Astronomical Society | bibcode=2013AAS...22125022M | postscript=. }}
4. ^1 {{citation | title=Models for the Gravitational Field of the Galactic Bar: An Application to Stellar Orbits in the Galactic Plane and Orbits of Some Globular Clusters | last1=Pichardo | first1=Bárbara | last2=Martos | first2=Marco | last3=Moreno | first3=Edmundo | display-authors=1 | journal=The Astrophysical Journal | volume=609 | issue=1 | pages=144–165 | date=July 2004 | doi=10.1086/421008 | bibcode=2004ApJ...609..144P | arxiv=astro-ph/0402340 | postscript=. }}
5. ^1 {{citation | display-authors=1 | title=The Clusters AgeS Experiment (CASE): RR Lyrae variables in the globular cluster NGC 6362 | last1=Olech | first1=A. | last2=Kaluzny | first2=J. | last3=Thompson | first3=I. B. | last4=Pych | first4=W. | last5=Krzemiński | first5=W. | last6=Schwarzenberg-Czerny | first6=A. | journal=Monthly Notices of the Royal Astronomical Society | volume=321 | issue=3 | pages=421–432 | date=March 2001 | doi=10.1046/j.1365-8711.2001.04010.x | postscript=. | bibcode=2001MNRAS.321..421O | arxiv=astro-ph/0005589 }}
6. ^1 2 {{citation | last1=Goldsbury | first1=Ryan | last2=Richer | first2=Harvey B. | last3=Anderson | first3=Jay | last4=Dotter | first4=Aaron | last5=Sarajedini | first5=Ata | last6=Woodley | first6=Kristin | title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters | journal=The Astronomical Journal | display-authors=1 | volume=140 | issue=6 | pages=1830–1837 | date=December 2010 | bibcode=2010AJ....140.1830G | arxiv=1008.2755 | doi=10.1088/0004-6256/140/6/1830 | postscript=. }}
7. ^1 {{citation | last1=Shapley | first1=Harlow | last2=Sawyer | first2=Helen B. | title=A Classification of Globular Clusters | journal=Harvard College Observatory Bulletin | volume=849 | issue=849 | pages=11–14 | date=August 1927 | bibcode=1927BHarO.849...11S | postscript=. }}
8. ^1 2 3 {{citation | last1=Forbes | first1=Duncan A. | last2=Bridges | first2=Terry | title=Accreted versus in situ Milky Way globular clusters | journal=Monthly Notices of the Royal Astronomical Society | volume=404 | issue=3 | pages=1203–1214 | date=May 2010 | doi=10.1111/j.1365-2966.2010.16373.x | postscript=. | bibcode=2010MNRAS.404.1203F | arxiv=1001.4289 }}
9. ^1 2 {{cite simbad | title= NGC 6171 | accessdate= 2006-11-16 }}
10. ^1 2 3 {{citation | last1=Boyles | first1=J. | last2=Lorimer | first2=D. R. | last3=Turk | first3=P. J. | last4=Mnatsakanov | first4=R. | last5=Lynch | first5=R. S. | last6=Ransom | first6=S. M. | last7=Freire | first7=P. C. | last8=Belczynski | first8=K. | title=Young Radio Pulsars in Galactic Globular Clusters | journal=The Astrophysical Journal | display-authors=1 | volume=742 | issue=1 | page=51 | date=November 2011 | doi=10.1088/0004-637X/742/1/51 | postscript=. | bibcode=2011ApJ...742...51B | arxiv=1108.4402 }}
11. ^1 2 {{citation | title=The globular cluster system of the galaxy. IV - The halo and disk subsystems | last1=Zinn | first1=R. | postscript=. | journal=Astrophysical Journal, Part 1 | volume=293 | date=June 15, 1985 | pages=424–444 | doi=10.1086/163249 | bibcode=1985ApJ...293..424Z }}
}}External links{{Commons category|Messier 107}}- Messier 107, Galactic Globular Clusters Database page
- {{WikiSky}}
{{Sky|16|32|31.91|-|13|03|13.1|20900}}{{Messier objects}} 6 : Globular clusters|Ophiuchus (constellation)|Messier objects|NGC objects|Astronomical objects discovered in 1782|Discoveries by Pierre Méchain |