NGC 6664

NGC 6664
NGC 6664
Observation data
Right ascension18h 37m 56s
Declination-08° 11’ 52”
Distance4892 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
ConstellationScutum

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.


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