NGC 6664

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NGC 6664
NGC 6664 PanS.jpg
NGC 6664
Observation data
Right ascension 18h 37m 56s
Declination -08° 11’ 52”
Distance 4892 ly (1.5kpc [1] )
Apparent magnitude  (V)7.8
Apparent dimensions (V)12′
Physical characteristics
Mass2000 [2]   M
Estimated age20 million years
Other designationsOCL 68, C 1834-082, Herschel 354 [3] , Melotte 209, Cr 385, Santa's Sleigh Cluster, Teacup Cluster [4]
Associations
Constellation Scutum
See also: Open cluster, List of open clusters

NGC 6664 is an open cluster in Scutum. [5] It has a magnitude of 7.8, and is visible with binoculars or a small telescope under good conditions. [6] It is located near NGC 6649. Due to its location in the galactic plane, it can be difficult to distinguish from the fainter background stars. [7]

It was discovered on June 16, 1784 by William Herschel, [8] and later observed by his son, John Herschel. [9] NGC 6664 is home to 16 Cepheid variable stars. 11 are B type, the remaining five are red giants. [10]

References

  1. https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1038&context=physicsschmidt
  2. Alonso-Santiago, J.; Negueruela, I.; Marco, A.; Tabernero, H. M.; Castro, N. (2020). "Three open clusters containing Cepheids: NGC 6649, NGC 6664, and Berkeley 55". Astronomy & Astrophysics. 644: A136. arXiv: 2009.12418 . Bibcode:2020A&A...644A.136A. doi:10.1051/0004-6361/202038495.
  3. "NGC 6664".
  4. "Deep Sky – Todd's Heavenly Bodies".
  5. "NGC 6664 - Open Cluster in Scutum | TheSkyLive".
  6. "Herschel 354NGC 6664".
  7. "NGC 6664".
  8. "New General Catalog Objects: NGC 6650 - 6699".
  9. "DOCdb - NGC 6664".
  10. Alonso-Santiago, J.; Negueruela, I.; Marco, A.; Tabernero, H. M.; Castro, N. (2020). "Three open clusters containing Cepheids: NGC 6649, NGC 6664, and Berkeley 55". Astronomy & Astrophysics. 644: A136. arXiv: 2009.12418 . Bibcode:2020A&A...644A.136A. doi:10.1051/0004-6361/202038495.