Astronomy:NGC 6664

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NGC 6664
NGC 6664
Observation data
ConstellationScutum
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]
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 is located nearby to the much brighter star Alpha Scuti.

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]

NGC 6664 contains the yellow supergiant EV Scuti, which is also classified a cepheid variable.[11]

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. doi:10.1051/0004-6361/202038495. Bibcode: 2020A&A...644A.136A. 
  3. ↑ "NGC 6664". https://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+6664&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. 
  4. ↑ "Deep Sky – Todd's Heavenly Bodies". https://gjy.ujq.mybluehost.me/deep-sky/. 
  5. ↑ "NGC 6664 - Open Cluster in Scutum | TheSkyLive". https://theskylive.com/sky/deepsky/ngc6664-object. 
  6. ↑ "Herschel 354NGC 6664". http://www.phys.ttu.edu/~ozprof/h354.htm. 
  7. ↑ "NGC 6664". http://www.phys.ttu.edu/~ozprof/6664c.htm. 
  8. ↑ "New General Catalog Objects: NGC 6650 - 6699". https://cseligman.com/text/atlas/ngc66a.htm#6664. 
  9. ↑ "DOCdb - NGC 6664". http://www.docdb.net/show_object.php?id=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. doi:10.1051/0004-6361/202038495. Bibcode: 2020A&A...644A.136A. 
  11. ↑ https://adsabs.harvard.edu/pdf/1982AJ.....87.1197SM

Template:NGC objects:6500-6999




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