NGC 6791
Open cluster in the constellation Lyra / From Wikipedia, the free encyclopedia
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NGC 6791 is an open star cluster in the Lyra constellation.[1] It was discovered by Friedrich August Theodor Winnecke in 1853. At roughly 8 billion years old, and with an iron to hydrogen abundance ratio that is more than twice that of the Sun, it is one of the oldest and most metal-rich clusters in the Milky Way. This is contrary to the typical rule-of-thumb where older means more metal-poor. Compounded with the fact that it has an unusually high population of stars, NGC 6791 is among the most studied clusters in the sky.[3][4]
Quick Facts Observation data (J2000 epoch), Right ascension ...
NGC 6791 | |
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Observation data (J2000 epoch) | |
Right ascension | 19h 20m 53s[1] |
Declination | +37° 46.3′[1] |
Distance | ~13,300 ly (4078 pc) |
Apparent magnitude (V) | +9.5[1] |
Apparent dimensions (V) | 16'[2] |
Physical characteristics | |
One of the oldest known open clusters | |
Other designations | C 1919+377, Cl Berkeley 46, OCl 142.0,[1] GC 4492[2] |
Associations | |
Constellation | Lyra |
See also: Open cluster, List of open clusters |
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