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词条 IC 4499
释义

  1. References

{{Infobox globular cluster
| name = IC 4499
| image =
| caption = IC 4499, as seen through the Hubble Space Telescope
| credit = NASA/ESA
| epoch = J2000
| class = XI[1]
| constellation = Apus
| ra = {{RA|15|00|18.57}}[1]
| dec = {{DEC|-82|12|49.6}}[1]
| dist_ly = {{convert|50,000|ly|pc|abbr=on|lk=on}}[1]
| appmag_v =9.76[5]
| size_v = 7.6′ × 7.6′[1]
| mass_msol =
| mass_kg =
| v_hb =
| metal_fe = -1.53[2]
| metal_z =
| age =
| notes =
| names =GCl 30[1]
}}IC 4499 is a loose globular cluster in the constellation Apus. It is located in the medium-far galactic halo.[3] Its apparent magnitude is 9.76,[4] and was thought to unusual because it appears to be 3-4 billion years younger than most other globular clusters in the Milky Way, as determined by metallicity measurements in 1995.[3] However, this was contradicted in 2011 by results that yielded a much older age of 12 billion years.

References

1. ^{{cite simbad|title=IC 4499|access-date=20 February 2017}}
2. ^{{cite web|title=Catalog of Parameters for Milky Way Globular Clusters|url=http://physwww.mcmaster.ca/~harris/mwgc.dat|author1=William E. Harris|accessdate=3 February 2017}}
3. ^{{cite journal |last1=Ferraro |first1=I. |last2=Ferraro |first2=F.R. |last3=Pecci |first3=F. Fusi |last4=Corsi |first4 = C.E. |last5=Buonanno |first5 = R. |date= August 1995 |title=Young globular clusters in the Milky Way: IC 4499 |journal=Monthly Notices of the Royal Astronomical Society |volume=275 |issue=4 |pages=1057–1076 |publisher=SAO/NASA ADS Astronomy Abstract Service |bibcode = 1995MNRAS.275.1057F |doi=10.1093/mnras/275.4.1057}}
4. ^{{cite web|url =http://spider.seds.org/spider/MWGC/i4499.html|title = IC 4499 |publisher = Students for the Exploration and Development of Space |accessdate = 22 April 2012 |last = Frommert |first = Hartmut}}

}}

3 : Apus (constellation)|Globular clusters|IC objects

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