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{{Infobox open cluster
| name = [[梅西耶天體|M]] 48
| image = [[File:M48a.jpg|250px]]
| epoch = [[J2000]]
| class =
| ra = {{RA|08|13|43.0}}<ref name=Wu2009a/>
| dec = {{Dec|-05|45|00}}<ref name=Wu2009a/>
| constellation = [[長蛇座]]
| dist_ly = {{Convert|770|pc|ly|order=flip|abbr=on|lk=on}}<ref name=Wu2009a/>
| appmag_v = 5.8<ref name=Mullaney2007/>
| size_v = {{Val|30|ul=arcminute}}<ref name=Mullaney2007/>
| mass_msol = {{Val|2366|1109|755|fmt=commas}}<ref name=Piskunov2008/>
| radius_ly = {{Val|63|u=ly}}<ref name=Piskunov2008/>
| age = {{Val|450|50}} Myr<ref name=Barnes2015/>
| notes =
| names = M48, [[NGC星表|NGC]] 2548,<ref name=SIMBAD/> [[Collinder catalogue|Cr]] 179, H IV-22
}}

'''M48'''或'''梅西耶48'''，也以'''NGC 2548'''為人所知，是位於[[天球赤道]]上的[[星座]]，[[長蛇座]]的一個[[疏散星團]]。它位於長蛇座最西端的邊界附近，靠近[[麒麟座]]<ref name=Sinnott_Perryman_1997/>，位於長蛇座最亮的[[星宿一]]東方偏南，角距離{{DEC|18|34}}<ref name=Adam2018/>。這個星團是[[梅西耶]]在1771年發現的；但就像他在M47中所犯的相同錯誤，它沒有給出正確的位置。他給出的[[赤經]]值是正確的，但是[[赤緯]]偏離了5度<ref name=WSH/>，因此人們有時會將發現的功勞歸給在1783年看見它的[[卡羅琳·赫歇爾]]<ref name=WSH/>，她的姪子[[約翰·赫歇爾]]形容它是"一個很好的星團，填補了整個區域；恆星的亮度介於9〜13等，沒有更暗的星，但它所處的整個天空卻奇形怪狀的點綴著無數微小的<ref name=Adam2018/>。"

在良好的條件下，用[[肉眼]]可以直接观测到M48。它最亮的一顆星是8.3等的HIP 40348<ref name=Adam2018/>。星團位於離太陽 {{Convert|770|pc|ly|disp=out|order=flip|abbr=off}}之處<ref name=Wu2009a/>。以{{link-en|恆星等齡線| Stellar isochrone }}估計它的年齡是{{Val|4|1}}億年，以[[自轉測年法]]估計的年齡是{{Val|4.5|0.5}}億年；算是相當一致<ref name=Barnes2015/>。這使得他的年齡介於[[昴宿星團]]的一億年和[[畢宿星團]]的六億五千萬年之間。依據鐵豐度，[Fe/H]]= {{val|−0.063|0.007|ul=金屬量#測量與計量{{!}}dex}}，金屬豐度若為-1，則表示比太陽少10倍。它比昴宿星團、畢宿星團和[[鬼宿星團]]更缺乏金屬元素<ref name=Sun_et_al_2020/>。

這個星團的[[球狀星團#潮汐半徑|潮汐半徑]]為{{Convert|19.4|±|2.4|pc|ly|order=flip|abbr=on}}<ref name=Piskunov2008/>，至少有438個成員<ref name=Vicente2016/>和質量為{{Val|2366|ul=solar mass|fmt=commas}}<ref name=Piskunov2008/>。可能是由於和[[星系盤]]的相互作用，這個星團的結構呈現塊狀的碎片。現在，這個星團被分為三組，每一組都有自己集體的[[自行]]<ref name=Vicente2016/>。

== 參考資料 ==
{{reflist|refs=

<ref name=SIMBAD>{{cite simbad | title=M 48 | access-date=2018-11-26 }}</ref>

<ref name=Sinnott_Perryman_1997>{{citation | postscript=.
| first1=Roger W. | last1=Sinnott
| first2=Michael A. C. | last2=Perryman
| title=Millennium Star Atlas | page=810
| volume=2 | year=1997 | isbn=0-933346-83-2
| publisher=Sky Publishing Corporation and the European Space Agency }}</ref>

<ref name=Sun_et_al_2020>{{citation
| title=WIYN Open Cluster Study LXXIX. M48 (NGC 2548) I. Radial Velocities, Rotational Velocities, and Metallicities of Stars in the Open Cluster M48 (NGC 2548)
| display-authors=1 | last1=Sun | first1=Qinghui
| last2=Deliyannis | first2=Constantine P. | last3=Steinhauer | first3=Aaron
| last4=Twarog | first4=Bruce A. | last5=Anthony-Twarog | first5=Barbara J.
| journal=The Astronomical Journal | postscript=.
| volume=159 | issue=5 | id=220 | pages=13 | date=May 2020
| arxiv=2004.06812 | bibcode=2020AJ....159..220S
| doi=10.3847/1538-3881/ab83ef }}</ref>

<ref name=Barnes2015>{{citation
| title=A color-period diagram for the open cluster M 48 (NGC 2548), and its rotational age
| last1=Barnes | first1=Sydney A. | last2=Weingrill | first2=Joerg
| last3=Granzer | first3=Thomas | last4=Spada | first4=Federico
| last5=Strassmeier | first5=Klaus G. | display-authors=1
| journal=Astronomy & Astrophysics
| volume=583 | id=A73 | pages=21 | date=November 2015
| doi=10.1051/0004-6361/201526129 | postscript=.
| bibcode=2015A&A...583A..73B | arxiv=1511.00554 }}</ref>

<ref name=Adam2018>{{citation
| title=Imaging the Messier Objects Remotely from Your Laptop
| series=The Patrick Moore Practical Astronomy Series
| first1=Len | last1=Adam | publisher=Springer
| year=2018 | isbn=978-3319653853 | page=227 | postscript=.
| url=https://books.google.com/books?id=7nNUDwAAQBAJ&pg=PA227 | bibcode=2018imor.book.....A
}}</ref>

<ref name=Vicente2016>{{citation
| title=NGC 2548: clumpy spatial and kinematic structure in an intermediate-age Galactic cluster
| last1=Vicente | first1=Belén | last2=Sánchez | first2=Néstor
| last3=Alfaro | first3=Emilio J. | display-authors=1
| journal=Monthly Notices of the Royal Astronomical Society
| volume=461 | issue=3 | pages=2519–2526 | date=September 2016
| doi=10.1093/mnras/stw1487 | arxiv=1606.06044
| bibcode=2016MNRAS.461.2519V | postscript=. }}</ref>

<ref name=Mullaney2007>{{citation
| title=The Herschel Objects and How to Observe Them
| series=Astronomers' Observing Guides
| first1=James | last1=Mullaney | postscript=.
| publisher=Springer Science & Business Media
| year=2007 | isbn=978-0387681252 | page=93
| url=https://books.google.com/books?id=HFg2sOjrFtsC&pg=PA93 | bibcode=2007hoho.book.....M
}}</ref>

<ref name=WSH>{{citation
| last=Houston | first=Walter Scott
| author-link=Walter Scott Houston
| title=Deep-Sky Wonders | postscript=.
| publisher=Sky Publishing Corporation
| year=2005 | isbn=978-1-931559-23-2 }}</ref>

<ref name=Wu2009a>{{citation | display-authors=1
| last1=Wu | first1 =Zhen-Yu | last2=Zhou | first2 =Xu
| last3=Ma | first3 =Jun | last4=Du | first4 =Cui-Hua
| title=The orbits of open clusters in the Galaxy
| journal=[[Monthly Notices of the Royal Astronomical Society]]
| volume=399 | issue=4 | pages=2146–2164 | date=November 2009
| arxiv=0909.3737 | bibcode=2009MNRAS.399.2146W
| doi=10.1111/j.1365-2966.2009.15416.x | postscript=. }}</ref>

<ref name=Piskunov2008>{{citation
| last1=Piskunov | first1=A. E. | last2=Schilbach | first2=E.
| last3=Kharchenko | first3=N. V. | last4=Röser | first4=S.
| last5=Scholz | first5=R.-D. | display-authors=1
| title=Tidal radii and masses of open clusters
| journal=Astronomy and Astrophysics
| volume=477 | issue=1 | pages=165–172
| date=January 2008 | doi=10.1051/0004-6361:20078525
| bibcode=2008A&A...477..165P | postscript=. | doi-access=free }}</ref>

}}

== 外部連結 ==
{{commons category|Messier 48}}
* [http://messier.seds.org/m/m048.html Messier 48, SEDS Messier pages] {{Wayback|url=http://messier.seds.org/m/m048.html |date=20150228075111 }}
* {{WikiSky}}

{{梅西耶天體}}
{{Ngc30}}
{{長蛇座}}
{{Sky|08|13.7|00|-|05|45|00|1500}}

[[Category:疏散星團|M048]]
[[Category:獵戶臂]]
[[Category:長蛇座|M048]]
[[Category:梅西耶天體|048]]
[[Category:NGC天體|Messier 048]]
[[Category:1771年發現的天體|17710219]]

M48 - 版本历史

imported>HMOXDSS1 来自 2024年12月1日 (日) 08:59