NGC 643

NGC 643
NGC 643 with DECam
Observation data (J2000 epoch)
Right ascension01h 35m 01.43s[1]
Declination−75° 33′ 24.7″[1]
Distance~200,000 ly
Apparent magnitude (V)13[2]
Apparent dimensions (V)1.50 arcmin[3]
Physical characteristics
Other designationsESO 29-SC50
Associations
ConstellationHydrus
See also: Open cluster, List of open clusters

NGC 643 is an open cluster located on the far outskirts of the Small Magellanic Cloud in the southern constellation of Hydrus, approximately 200,000 light-years from Earth.[1][3][4] Due to their close proximity to NGC 643, the open cluster ESO 29-SC44 and the galaxies PGC 6117 and PGC 6256 are also designated NGC 643A, NGC 643B and NGC 643C, respectively.[4] NGC 643 is relatively old. Its brightest stars have an apparent magnitude of 19.[2]

Observation history

NGC 643 was discovered by the British astronomer John Herschel on 18 September, 1835. John Louis Emil Dreyer, compiler of the first New General Catalogue of Nebulae and Clusters of Stars, described NGC 643 as being "very faint, pretty small, round" and as becoming "very gradually a little brighter [in the] middle".[4]

See also

References

  1. ^ a b c "NGC 643 NASA/IPAC Extragalactic Database Results". ned.ipac.caltech.edu. Retrieved November 1, 2018.
  2. ^ a b de Vaucouleurs, G. (1957). "NGC 643: A New Outlying Cluster of the Small Magellanic Cloud". Publications of the Astronomical Society of the Pacific. 69 (408): 252–255. Bibcode:1957PASP...69..252D. doi:10.1086/127060. JSTOR 40676443.
  3. ^ a b "Revised NGC Data for NGC 643". spider.seds.org. Retrieved November 1, 2018.
  4. ^ a b c "New General Catalog Objects: NGC 600 - 649". cseligman.com. Retrieved November 1, 2018.

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