NGC 6819

NGC 6819
Credit: Tom Wildener
Observation data (J2000 epoch)
Right ascension	19h 41m 18.0s[1]
Declination	+40° 11′ 12″[1]
Distance	7,200 ly
Apparent magnitude (V)	7.3[1]
Apparent dimensions (V)	5'
Physical characteristics
Other designations	Collinder 403
Associations
Constellation	Cygnus
See also: Open cluster, List of open clusters

NGC 6819 is an open cluster (commonly known as an "open star cluster") located 7,200 light years away in the Cygnus constellation. It was discovered by Caroline Herschel on 12 May 1784.

Situated on the boundary of Cygnus and Lyra, NGC 6819 contains roughly two dozen stars of magnitude 10 to 12, with many more lower magnitude members.^[2]

The age of NGC 6819 is estimated here to be ~ 2.5 ± 0.5 Gyr.^[3] Its distance is calculated to be 2.16 ± 0.57 kpc.^[4]

References

External links

• Media related to NGC 6819 at Wikimedia Commons
• NGC 6819 at SEDS
• NGC 6819 at Silicon Owl
• NGC 6819 at Messier45^{[permanent dead link]}
• NGC 6819 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

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