Messier 107

Messier 107
Messier 107
	M107 fromHubble Space Telescope;3.5′view
Observation data (J2000epoch)
Class	X
Right ascension	16h32m31.86s
Declination	–13° 03′ 13.6″
Distance	20.9kly(6.4kpc)
Apparent magnitude(V)	7.9
Apparent dimensions(V)	10′
Physical characteristics
Mass	1.82×105M☉
Radius	30 ly
Metallicity	= –0.95dex
Estimated age	13.95Gyr
Other designations	C 1629-129, GCl 44, M 107,NGC6171
	See also:Globular cluster,List of globular clusters

Messier 107orM107,also known asNGC 6171or theCrucifix Cluster,is a very looseglobular clusterin a very mildlysouthern part of the skyclose to theequatorinOphiuchus,and is the last such object in theMessier Catalogue.

Observational history, namings and guide[edit]

It was discovered byPierre Méchainin April 1782, then independently byWilliam Herschelin 1793. Herschel's son, John, in his 1864 General Catalogue, described it as a "globular cluster of stars, large, very rich, very much compressed, round, well resolved, clearly consisting of stars".^[5]It was not until 1947 thatHelen Sawyer Hoggadded it and three other objects found by Méchain to the modern Catalogue, the latter having contributed several of the suggested observation objects which Messier had verified and added.^[9]The cluster is to be found 2.5° south and slightly west of the starZeta Ophiuchi.^[5]

Properties[edit]

M107 is close to thegalactic planeand about 20,900light-yearsfromEarth^[3]and 9,800 ly (3,000 pc) from theGalactic Center.^[10]Its orbit is partly as far out as thegalactic halo,as is between 9,200–12,400 ly (2,820–3,790 pc) from theGalactic Center,the lower figure, the "perigalactic distance" sees it enter and leave thegalactic bar.^[11]

It is anOosterhoff type I^[12]cluster with ametallicityof −0.95^[7]^[a]and it conforms with the bulk of thehalopopulation.^[10]There are 22 knownRR Lyrae variablestars in this cluster and a probableSX Phoenicis variable.^[13]

Gallery[edit]

The globular star cluster Messier 107 image taken by the Wide Field Imager (WFI) on theMPG/ESO 2.2-metre telescope
Map showing the location of M107

References and footnotes[edit]

^Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters",Harvard College Observatory Bulletin,849(849): 11–14,Bibcode:1927BHarO.849...11S.
^^a ^bGoldsbury, Ryan; et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters",The Astronomical Journal,140(6): 1830–1837,arXiv:1008.2755,Bibcode:2010AJ....140.1830G,doi:10.1088/0004-6256/140/6/1830,S2CID 119183070.
^^a ^b ^cBoyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters",The Astrophysical Journal,742(1): 51,arXiv:1108.4402,Bibcode:2011ApJ...742...51B,doi:10.1088/0004-637X/742/1/51,S2CID 118649860.
^"Messier 107".SEDS Messier Catalog.Retrieved30 April2022.
^^a ^b ^cMullaney, James (2007),The Herschel Objects and How to Observe Them,Astronomers' Observing Guides, Springer Science & Business Media, p. 94,Bibcode:2007hoho.book.....M,ISBN 978-0387681252.
^Fromtrigonometry:distance ×sin( diameter_angle / 2 )= 39.5 ly. radius
^^a ^b ^cForbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters",Monthly Notices of the Royal Astronomical Society,404(3): 1203–1214,arXiv:1001.4289,Bibcode:2010MNRAS.404.1203F,doi:10.1111/j.1365-2966.2010.16373.x,S2CID 51825384.
^"NGC 6171".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2006-11-16.
^Frommert, Hartmut; Kronberg, Christine (August 30, 2007),"Messier 107",SEDS Messier pages,Students for the Exploration and Development of Space (SEDS),retrieved2018-12-07.
^^a ^bZinn, R. (June 15, 1985), "The globular cluster system of the galaxy. IV - The halo and disk subsystems",Astrophysical Journal, Part 1,293:424–444,Bibcode:1985ApJ...293..424Z,doi:10.1086/163249.
^Pichardo, Bárbara; et al. (July 2004), "Models for the Gravitational Field of the Galactic Bar: An Application to Stellar Orbits in the Galactic Plane and Orbits of Some Globular Clusters",The Astrophysical Journal,609(1): 144–165,arXiv:astro-ph/0402340,Bibcode:2004ApJ...609..144P,doi:10.1086/421008,S2CID 16356464.
^Olech, A.; et al. (March 2001), "The Clusters AgeS Experiment (CASE): RR Lyrae variables in the globular cluster NGC 6362",Monthly Notices of the Royal Astronomical Society,321(3): 421–432,arXiv:astro-ph/0005589,Bibcode:2001MNRAS.321..421O,doi:10.1046/j.1365-8711.2001.04010.x,S2CID 14453719.
^McCombs, Thayne; et al. (January 2013), "Variable Stars in the Globular Cluster M107: The Discovery of a Probable SX Phoenicis",AAS Meeting #221,vol. 221, American Astronomical Society, p. 250.22,Bibcode:2013AAS...22125022M,250.22.

^Where minus 1 would be 10 times less iron-to-hydrogen metallicity than the Sun

External links[edit]

[hcob849_11-1] Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters",Harvard College Observatory Bulletin,849(849): 11–14,Bibcode:1927BHarO.849...11S.

[aj140_6_1830-2] Goldsbury, Ryan; et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters",The Astronomical Journal,140(6): 1830–1837,arXiv:1008.2755,Bibcode:2010AJ....140.1830G,doi:10.1088/0004-6256/140/6/1830,S2CID 119183070.

[apj742_1_51-3] Boyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters",The Astrophysical Journal,742(1): 51,arXiv:1108.4402,Bibcode:2011ApJ...742...51B,doi:10.1088/0004-637X/742/1/51,S2CID 118649860.

[4] "Messier 107".SEDS Messier Catalog.Retrieved30 April2022.

[Mullaney2007-5] Mullaney, James (2007),The Herschel Objects and How to Observe Them,Astronomers' Observing Guides, Springer Science & Business Media, p. 94,Bibcode:2007hoho.book.....M,ISBN 978-0387681252.

[6] Fromtrigonometry:distance ×sin( diameter_angle / 2 )= 39.5 ly. radius

[mnras404_3_1203-7] Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters",Monthly Notices of the Royal Astronomical Society,404(3): 1203–1214,arXiv:1001.4289,Bibcode:2010MNRAS.404.1203F,doi:10.1111/j.1365-2966.2010.16373.x,S2CID 51825384.

[simbad-8] "NGC 6171".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2006-11-16.

[Frommert2007-9] Frommert, Hartmut; Kronberg, Christine (August 30, 2007),"Messier 107",SEDS Messier pages,Students for the Exploration and Development of Space (SEDS),retrieved2018-12-07.

[Zinn1985-10] Zinn, R. (June 15, 1985), "The globular cluster system of the galaxy. IV - The halo and disk subsystems",Astrophysical Journal, Part 1,293:424–444,Bibcode:1985ApJ...293..424Z,doi:10.1086/163249.

[Pichardo2004-11] Pichardo, Bárbara; et al. (July 2004), "Models for the Gravitational Field of the Galactic Bar: An Application to Stellar Orbits in the Galactic Plane and Orbits of Some Globular Clusters",The Astrophysical Journal,609(1): 144–165,arXiv:astro-ph/0402340,Bibcode:2004ApJ...609..144P,doi:10.1086/421008,S2CID 16356464.

[Olech2001-12] Olech, A.; et al. (March 2001), "The Clusters AgeS Experiment (CASE): RR Lyrae variables in the globular cluster NGC 6362",Monthly Notices of the Royal Astronomical Society,321(3): 421–432,arXiv:astro-ph/0005589,Bibcode:2001MNRAS.321..421O,doi:10.1046/j.1365-8711.2001.04010.x,S2CID 14453719.

[McCombs2013-14] McCombs, Thayne; et al. (January 2013), "Variable Stars in the Globular Cluster M107: The Discovery of a Probable SX Phoenicis",AAS Meeting #221,vol. 221, American Astronomical Society, p. 250.22,Bibcode:2013AAS...22125022M,250.22.

[13] Where minus 1 would be 10 times less iron-to-hydrogen metallicity than the Sun

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v t e Messier objects
List	M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 M12 M13 M14 M15 M16 M17 M18 M19 M20 M21 M22 M23 M24 M25 M26 M27 M28 M29 M30 M31 M32 M33 M34 M35 M36 M37 M38 M39 M40 M41 M42 M43 M44 M45 M46 M47 M48 M49 M50 M51 M52 M53 M54 M55 M56 M57 M58 M59 M60 M61 M62 M63 M64 M65 M66 M67 M68 M69 M70 M71 M72 M73 M74 M75 M76 M77 M78 M79 M80 M81 M82 M83 M84 M85 M86 M87 M88 M89 M90 M91 M92 M93 M94 M95 M96 M97 M98 M99 M100 M101 M102 M103 Added M104 M105 M106 M107 M108 M109 M110
See also	Caldwell catalogue Catalogue of Nebulae and Clusters of Stars Herschel 400 Catalogue Index Catalogue New General Catalogue Revised New General Catalogue
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Observational history, namings and guide[edit]

Properties[edit]

Gallery[edit]

See also[edit]

References and footnotes[edit]

External links[edit]