NGC 6284

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NGC 6284
NGC 6284 WFC3.jpg
NGC 6284 as seen through the Hubble Space Telescope
Observation data (J2000 epoch)
Class IX
Constellation Ophiuchus
Right ascension 17h 04m 28.747s [1]
Declination −24° 45′ 51.22″ [1]
Distance 43,000 ly [2] (13,200 pc [2] )
Apparent magnitude (V)7.43 [1]
Apparent dimensions (V)6.2' × 6.2' [3]
Physical characteristics
Metallicity  = -1.26 [4] dex
Estimated age13.3~ billion years
Other designationsGCl 53, 2MASX J17042874-2445512 [1]
See also: Globular cluster, List of globular clusters

NGC 6284 is a globular cluster located in the constellation Ophiuchus. It is designated as IX in the galaxy morphological classification scheme and was discovered by the German-born British astronomer William Herschel on 22 May 1784. Its distance had previously been estimated at 49,900 light years from Earth, [5] [3] [6] [7] [8] but this was revised in 2023 to around 43,000 light years. [2] This same study, based on high-resolution Hubble Space Telescope optical observations, produced the first high-quality colour-magnitude diagram (CMD) of NGC 6284, extending down to about six magnitudes below its main sequence turn-off. The new observations moved its centre of gravity by 1.5–3 arcseconds from previous values, and its density profile showed a steep central cusp, suggesting that NGC 6284 is a post-core collapse (PCC) cluster.

Contents

The nearby metal-poor star HD 194598  [ es ] may be a recent runaway from NGC 6284. [9]

See also

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References

  1. 1 2 3 4 "NGC 6284". SIMBAD . Centre de données astronomiques de Strasbourg.
  2. 1 2 3 "Globular cluster NGC 6284 inspected by astronomers".
  3. 1 2 "Revised NGC Data for NGC 6284". Seds. Retrieved 3 October 2015.
  4. ↑ William E. Harris. "Catalog of Parameters for Milky Way Globular Clusters" . Retrieved 3 February 2017.
  5. ↑ "Object No. 1 - NGC 6284". NASA/IPAC extragalactic database. NASA/IPAC. Retrieved 3 October 2015.
  6. ↑ "NGC 6284 (= GCL 53)". cseligman. Retrieved 3 October 2015.
  7. ↑ "NGC 6284". Seds. Retrieved 3 October 2015.
  8. ↑ "The globular cluster NGC 6284". In-the-sky. Retrieved 3 October 2015.
  9. ↑ Şahin, Timur; Bilir, Selçuk (2020), "On the Origin of Metal-poor Stars in the Solar Neighborhood", The Astrophysical Journal, 899 (1): 41, arXiv: 2007.08514 , Bibcode:2020ApJ...899...41S, doi: 10.3847/1538-4357/aba2d2 , S2CID   220545932


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