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{{Infobox open cluster
| image = File:IC 4665.png|300px
| caption = 位於[[蛇夫座β]]下方的疏散星團IC 4665
| name = IC 4665
| epoch = [[J2000]]
| ra = {{RA|17|46|13.0}}<ref name=Tarricq_et_al_2021/>
| dec = {{DEC|+05|36|54}}<ref name=Tarricq_et_al_2021/>
| dist_ly = 1.12 [[Light-year#Distances in light-years|kly]]
| dist_pc = 343.6 [[秒差距|pc]]<ref name=Jeffries_et_al_2023/>
| appmag_v = 4.2<ref name=Crossen_Rhemann_2012/>
| size_v = {{val|40|×|40|u=arcminute}}<ref name=Crossen_Rhemann_2012/>
| constellation = [[蛇夫座]]
| radius_ly =
| absmag_v =
| notes =
| age = {{val|55|3}} Myr<ref name=Jeffries_et_al_2023/>
| names = [[科林德目錄|Cr]] 349、[[梅洛特目錄|Mel]] 179<ref name="simbad" />
}}

'''IC 4665'''（科林德349 / 梅洛特179）是在[[星座]][[蛇夫座]]的一個[[疏散星團]]，位於[[宗正一]]（蛇夫座 β）的東北方約1°處<ref name=Crossen_Rhemann_2012/>。它是瑞士天文學家{{link-en|讓－菲利浦·德·舍索|Jean-Philippe de Chéseaux}}於1745年發現的。該星團距離[[地球]]約1,100 [[光年]]<ref name=Jeffries_et_al_2023/>。即使用最小的[[望遠鏡]]或[[雙筒望遠鏡]]都很容易看到<ref name=Crossen_Rhemann_2012/>。在足夠暗的地方用[[肉眼]]可以直接看到。可能是因為它太鬆散和粗曠了，使得[[查爾斯·梅西耶]]和[[威廉·赫歇爾]]都沒有編入星表的最亮星團之一。

對這個星團的年齡估計從2000萬年到1億年不等。將恆星的[[鋰衰竭界限|鋰衰竭]]與其他星團進行比較表明，它大約在5500萬年前開始發展<ref name=Jeffries_et_al_2023/>。[[主序轉折點]]年齡的上限為{{val|42|12}}百萬年<ref name=Cargile_James_2010/>。已確定的星團候選成員有819顆<ref name=Miret-Roig_et_al_2020/>，1977年發現兩顆[[特殊恆星|化學性質特異恆星]]也是成員星<ref name=Levato_Malaroda_1977/>。

有證據表明，IC 4665正在與位於約4°外的老星團科林德350發生碰撞。目前，它們之間的距離為{{cvt|36.25|pc|ly|order=flip}}，而在形成時相距至少有{{cvt|500|pc|ly|order=flip}}。目前尚不清楚這兩個星團是否會因碰撞而合併<ref name=Piatti_Malhan_2022/>。
== 參考資料 ==
{{reflist|refs=

<ref name="simbad">{{cite simbad
| title=IC 4665 | access-date=2007-04-17 }}</ref>

<ref name=Crossen_Rhemann_2012>{{cite book
| title=Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes
| first1=Craig | last1=Crossen | first2=Gerald | last2=Rhemann
| publisher=Springer Science & Business Media
| isbn=9783709106266 | page=60 | year=2012
| url=https://books.google.com/books?id=3vELBwAAQBAJ&pg=PA60 }}</ref>

<ref name=Jeffries_et_al_2023>{{cite journal
| title=A revised age greater than 50 Myr for the young cluster IC 4665
| display-authors=1 | last1=Jeffries | first1=R. D.
| last2=Jackson | first2=R. J. | last3=Binks | first3=A. S.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=526 | pages=1260–1267 | date=2023
| arxiv=2309.07619 | bibcode=2023MNRAS.526.1260J
| doi=10.1093/mnras/stad2845 | doi-access=free }}</ref>

<ref name=Tarricq_et_al_2021>{{cite journal
| title=3D kinematics and age distribution of the open cluster population
| display-authors=1 | last1=Tarricq | first1=Y.
| last2=Soubiran | first2=C. | last3=Casamiquela | first3=L.
| last4=Cantat-Gaudin | first4=T. | last5=Chemin | first5=L.
| last6=Anders | first6=F. | last7=Antoja | first7=T.
| last8=Romero-Gómez | first8=M. | last9=Figueras | first9=F.
| last10=Jordi | first10=C. | last11=Bragaglia | first11=A.
| last12=Balaguer-Núñez | first12=L. | last13=Carrera | first13=R.
| last14=Castro-Ginard | first14=A. | last15=Moitinho | first15=A.
| last16=Ramos | first16=P. | last17=Bossini | first17=D.
| journal=Astronomy & Astrophysics
| volume=647 | at=id. A19 | date=March 2021
| doi=10.1051/0004-6361/202039388 | arxiv=2012.04017
| bibcode=2021A&A...647A..19T }}</ref>

<ref name=Piatti_Malhan_2022>{{cite journal
| title=First evidence of a collision between two unrelated open clusters in the Milky Way
| last1=Piatti | first1=Andrés E. | last2=Malhan | first2=Khyati
| journal=Monthly Notices of the Royal Astronomical Society: Letters
| volume=511 | issue=1 | pages=L1–L7 | date=March 2022
| doi=10.1093/mnrasl/slab130 | doi-access=free | arxiv=2112.03786
| bibcode=2022MNRAS.511L...1P }}</ref>

<ref name=Miret-Roig_et_al_2020>{{cite journal
| title=Searching for debris discs in the 30 Myr open cluster IC 4665
| display-authors=1 | last1=Miret-Roig | first1=N.
| last2=Huélamo | first2=N. | last3=Bouy | first3=H.
| journal=Astronomy & Astrophysics
| volume=641 | at=id. A156 | date=September 2020
| doi=10.1051/0004-6361/202038205 | arxiv=2007.04992
| bibcode=2020A&A...641A.156M }}</ref>

<ref name=Cargile_James_2010>{{cite journal
| title=Employing a New, BVI<sub>c</sub> Photometric Survey of IC 4665 to Investigate the Age of This Young Open Cluster
| last1=Cargile | first1=P. A. | last2=James | first2=D. J.
| journal=The Astronomical Journal
| volume=140 | issue=3 | pages=677–691 | date=September 2010
| doi=10.1088/0004-6256/140/3/677 | arxiv=1005.3329
| bibcode=2010AJ....140..677C }}</ref>

<ref name=Levato_Malaroda_1977>{{cite journal
| title=Spectroscopic study of two peculiar stars in IC 4665 : HD 161480 and HD 161733
| last1=Levato | first1=H. | last2=Malaroda | first2=S.
| journal=Publications of the Astronomical Society of the Pacific
| volume=89 | pages=84–94 | date=February 1977
| doi=10.1086/130078 | bibcode=1977PASP...89...84L }}</ref>

}}

== 外部連結 ==
* {{commonscat-inline}}
* [http://messier.seds.org/xtra/ngc/i4665.html IC 4665 @ SEDS IC objects pages]
* [http://www.univie.ac.at/webda/cgi-bin/ocl_page.cgi?cluster=IC+4665 IC 4665 www.univie.ac.at]
* {{WikiSky}}
* [https://purl.fdlp.gov/GPO/gpo42005 X-Ray Activity in the Open Cluster IC 4665] [[National Aeronautics and Space Administration]]

{{Ophiuchus}}
{{Sky|17|46|18|+|05|43|00|1400}}

[[Category:IC天體|4665]]
[[Category:疏散星團]]
[[Category:蛇夫座]]

IC 4665 - 版本历史

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