NGC 6664

NGC 6664
NGC 6664
Observation data
Right ascension18h 37m 56s
Declination-08° 11’ 52”
Distance4892 ly (1.5kpc)
Apparent magnitude (V)7.8
Apparent dimensions (V)12′
Physical characteristics
Mass2000 M☉
Estimated age20 million years
Other designationsOCL 68, C 1834-082, Herschel 354, Melotte 209, Cr 385, Santa's Sleigh Cluster, Teacup Cluster
Associations
ConstellationScutum
See also: Open cluster, List of open clusters

NGC 6664, also known as Santa's Sleigh or the Teacup Cluster, is an open cluster in Scutum. It has a magnitude of 7.8, and is visible with binoculars or a small telescope under good conditions. 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. It is located nearby to the much brighter star Alpha Scuti.

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

NGC 6664 contains the yellow supergiant EV Scuti, which is also classified a cepheid variable.

References

  1. ↑ Schmidt, Edward G. "Intermediate-Band Photometry in the Open Cluster NGC 6664".
  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. ↑ O'Meara, Stephen James (2011). Deep-Sky Companions: The Secret Deep. Cambridge University Press. ISBN 978-0-521-19876-9.
  6. ↑ "NGC 6664 - Open Cluster in Scutum | TheSkyLive".
  7. ↑ "Herschel 354NGC 6664".
  8. ↑ "NGC 6664".
  9. ↑ "New General Catalog Objects: NGC 6650 - 6699".
  10. ↑ "DOCdb - NGC 6664".
  11. ↑ 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.
  12. ↑ https://adsabs.harvard.edu/pdf/1982AJ.....87.1197SM