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{{Infobox globular cluster
| name = NGC 6540
| image = NGC6540 - HST - Potw2233a.jpg
| caption = [[Hubble Space Telescope]] image of NGC 6540
| class =
| epoch = [[J2000]]
| constellation = [[人馬座]]
| ra = {{RA|18|06|08.60}}<ref name=Di_Criscienzo_et_al_2006/>
| dec = {{DEC|-27|45|55.0}}<ref name=Di_Criscienzo_et_al_2006/>
| dist_ly = {{cvt|3.7|±|0.3|kpc|kly|order=flip}}<ref name=Pérez-Villegas_et_al_2018/>
| appmag_v = 9.30<ref name=seds/>
| absmag_v = −5.38<ref name=Di_Criscienzo_et_al_2006/>
| size_v =
| mass_msol =
| radius_arcminsec = {{val|4.75|x|4.75|u=arcminute}}<ref name=seds/>
| v_hb =
| metal_fe = −1.20<ref name=Di_Criscienzo_et_al_2006/>
| metal_z =
| age =
| notes =
| names = {{odlist | name=C 1803-278 | Cr=364 | NGC=6540 }}<ref name=simbad/>
}}

'''NGC 6540'''是位於[[人馬座]]的一個[[球狀星團]]，距離銀河系中心約4.66°<ref name=Bica_et_al_1994/>。

1784年5月24日，德裔[[英國]][[天文學家]][[威廉·赫歇爾]]用一台18.7[[英寸]][[望遠鏡]]發現了NGC 6540，他將該星團描述為“相當暗淡，不大，彎曲延伸，易於分辨”。NGC 6540的視星等為9.3等，角直徑約9.5[[角分]]。

NGC 6540星團距離太陽12000[[光年]]（3700千秒差距）<ref name=Pérez-Villegas_et_al_2018/>，距離銀河系中心14000光年（4400[[秒差距]]）。NGC 6540被確認為球狀星團之前，最初被認為是一個[[疏散星團]]<ref name=Di_Criscienzo_et_al_2006/>。NGC 6540星團包含一個不確定類型的特殊X射線源<ref name=Mereghetti_et_al_2018/>。

==參考資料==
{{reflist|refs=

<ref name=simbad>{{cite simbad
| title=NGC 6540 | accessdate=7 January 2017 }}</ref>

<ref name=seds>{{cite web
| title=NGC 6540
| publisher=Students for the Exploration and Development of Space
| url=http://spider.seds.org/spider/MWGC/n6540.html
| access-date=15 January 2016 }}</ref>

<ref name=Di_Criscienzo_et_al_2006>{{cite journal | display-authors=1
| title=RR Lyrae-based calibration of the Globular Cluster Luminosity Function
| last1=Di Criscienzo | first1=M. | last2=Caputo | first2=F.
| last3=Marconi | first3=M. | last4=Musella | first4=I.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=365 | issue=4 | pages=1357–1366 | date=February 2006
| doi=10.1111/j.1365-2966.2005.09819.x | doi-access=free | s2cid=17838243
| bibcode=2006MNRAS.365.1357D | arxiv=astro-ph/0511128 }}</ref>

<ref name=Bica_et_al_1994>{{cite journal
| title=The globular cluster NGC 6540
| url=https://archive.org/details/sim_astronomy-and-astrophysics_1994-03-01_283_1/page/66
| display-authors=1 | last1=Bica | first1=E.
| last2=Ortolani | first2=S. | last3=Barbuy | first3=B.
| journal=Astronomy and Astrophysics
| volume=283 | pages=67–75 | date=March 1994
| bibcode=1994A&A...283...67B }}</ref>

<ref name=Pérez-Villegas_et_al_2018>{{cite journal
| title=Orbits of Selected Globular Clusters in the Galactic Bulge
| last1=Pérez-Villegas | first1=A. | last2=Rossi | first2=L.
| last3=Ortolani | first3=S. | last4=Casotto | first4=S.
| last5=Barbuy | first5=B. | last6=Bica | first6=E.
| journal=Publications of the Astronomical Society of Australia
| volume=35 | at=id. e021 | date=May 2018
| doi=10.1017/pasa.2018.16 | arxiv=1804.05781
| bibcode=2018PASA...35...21P | display-authors=1 }}</ref>

<ref name=Mereghetti_et_al_2018>{{cite journal
| title=EXTraS discovery of a peculiar flaring X-ray source in the Galactic globular cluster NGC 6540
| last1=Mereghetti | first1=Sandro | last2=De Luca | first2=Andrea
| last3=Salvetti | first3=David | last4=Belfiore | first4=Andrea
| last5=Marelli | first5=Martino | last6=Paizis | first6=Adamantia
| last7=Rigoselli | first7=Michela | last8=Salvaterra | first8=Ruben
| last9=Sidoli | first9=Lara | last10=Tiengo | first10=Andrea
| display-authors=1 | journal=Astronomy & Astrophysics
| volume=616 | at=id. A36 | date=August 2018
| doi=10.1051/0004-6361/201833086 | arxiv=1805.08057
| bibcode=2018A&A...616A..36M }}</ref>

}}

==外部連結==
* [http://spider.seds.org/spider/MWGC/n6540.html NGC 6540]
* [[Robert Burnham, Jr]], ''Burnham's Celestial Handbook: An observer's guide to the universe beyond the solar system'', vol 3, p. 1556

{{Ngc70}}

[[Category:球狀星團]]
[[Category:人馬座]]
[[Category:NGC天体]]

NGC 6540 - 版本历史

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