IC 4499

Short description: Globular cluster in the constellation Apus

IC 4499

IC 4499, as seen through the Hubble Space Telescope

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| [Fe/H] = −1.53[3] dex
Other designations| GCl 30, Melotte 129[2]
See also: Globular cluster, List of globular clusters

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 be 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]

As typical for very old globular clusters, IC 4499 contains two generations of stars.[6]

## References

1. ↑ 1.0 1.1 1.2 1.3 Frommert, Hartmut. "IC 4499". Students for the Exploration and Development of Space. http://spider.seds.org/spider/MWGC/i4499.html. Retrieved 22 April 2012.
2. ↑ 2.0 2.1 2.2 "IC 4499". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=IC+4499.
3. ↑ 3.0 3.1 "Catalog of Parameters for Milky Way Globular Clusters". http://physwww.mcmaster.ca/~harris/mwgc.dat. Retrieved 3 February 2017.
4. ↑ 4.0 4.1 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. doi:10.1093/mnras/275.4.1057. Bibcode: 1995MNRAS.275.1057F.
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, doi:10.1111/j.1365-2966.2011.18736.x, Bibcode: 2011MNRAS.415..643W.
6. ↑ IC 4499 revised: Spectro-photometric evidence of small light-element variations

* v
* t
* e

Constellation of Apus

* Apus in Chinese astronomy
* List of stars in Apus

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ1
* κ2

|

Variable|

* R
* S
* Z
* MY
* NO

HR|

* 5955
* 6135

HD|

* 124639
* 130458
* 131551
* 131664
* 134606
* 137388 (Karaka)
* 137509
* 141846
* 152010
* 161988
* 164712
* 165259

| Star clusters|

* IC 4499
* NGC 6101

|

Category

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/IC 4499. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:IC_4499&oldid=18554"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template