| NGC 6664 | |
|---|---|
 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 | |
| Mass | 2000[2] M☉ |
| Estimated age | 20 million years |
| Other designations | OCL 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 anopen cluster inScutum.[5] It has a magnitude of 7.8, and is visible with binoculars or a small telescope under good conditions.[6] It is located nearNGC 6649. Due to its location in thegalactic plane, it can be difficult to distinguish from the fainter background stars.[7] It is located nearby to the much brighter starAlpha Scuti.
It was discovered on June 16, 1784 byWilliam Herschel,[8] and later observed by his son,John Herschel.[9] NGC 6664 is home to 16Cepheid variable stars. 11 are B type, the remaining five are red giants.[10]
NGC 6664 contains theyellow supergiant EV Scuti, which is also classified a cepheid variable.[11]
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