IC 4499

IC 4499
IC 4499, as seen through the Hubble Space Telescope
Credit: NASA/ESA
Observation data (J2000 epoch)
Class XI[1]
Constellation Apus
Right ascension 15h 00m 18.57s[2]
Declination −82° 12′ 49.6″[2]
Distance 50,000 ly (15,000 pc)[1]
Apparent magnitude (V) 9.76[3]
Apparent dimensions (V) 7.6′ × 7.6′[1]
Physical characteristics
Metallicity  = -1.53[3] dex
Other designations GCl 30[2]

IC 4499 is a loose globular cluster in the constellation Apus. It is located in the medium-far galactic halo.[4] Its apparent magnitude is 9.76,[1] 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.[4] However, this was contradicted in 2011 by results that yielded a much older age of 12 billion years.[5]

References

  1. 1 2 3 4 Frommert, Hartmut. "IC 4499". Students for the Exploration and Development of Space. Retrieved 22 April 2012.
  2. 1 2 3 "IC 4499". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 February 2017.
  3. 1 2 William E. Harris. "Catalog of Parameters for Milky Way Globular Clusters". Retrieved 3 February 2017.
  4. 1 2 Ferraro, I.; Ferraro, F.R.; Pecci, F. Fusi; Corsi, C.E.; Buonanno, R. (August 1995). "Young globular clusters in the Milky Way: IC 4499". Monthly Notices of the Royal Astronomical Society. SAO/NASA ADS Astronomy Abstract Service. 275 (4): 1057–1076. Bibcode:1995MNRAS.275.1057F. doi:10.1093/mnras/275.4.1057.
  5. ↑ Walker, A. R.; et al. (July 2011), "Constraints on the formation of the globular cluster IC 4499 from multiwavelength photometry", Monthly Notices of the Royal Astronomical Society, 415 (1): 643–654, arXiv:1103.4144, Bibcode:2011MNRAS.415..643W, doi:10.1111/j.1365-2966.2011.18736.x.
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