IC 4756
Open cluster in the constellation Serpens / From Wikipedia, the free encyclopedia
IC 4756 is a large bright open cluster in the constellation Serpens. Known as Graff's Cluster, it is bright enough to be seen with the naked eye and considered a fine cluster for binoculars or small telescopes.[2]
Quick Facts Observation data (J2000 epoch), Right ascension ...
IC 4756 | |
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Observation data (J2000 epoch) | |
Right ascension | 18h 38m 31.2s[1] |
Declination | +05° 29′ 24″[1] |
Distance | 1.3 kly (400 pc) |
Apparent magnitude (V) | 4.6[1] |
Physical characteristics | |
Other designations | Cr 386, Mel 210 |
Associations | |
Constellation | Serpens |
See also: Open cluster, List of open clusters |
Close
IC 4756 is also known as the Tweedledee Cluster (paired with NGC 6633 as Tweedledum), also as the Secret Garden Cluster.[3]
Metallicity of IC 4756 is similar to the Sun, at -0.02±0.01 dex.[4]