IC 4756
IC 4756 | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Serpens |
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 |
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]
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]
References[]
- ^ a b c "IC 4756". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 November 2016.
- ^ Michael Bakich. "The Omega Nebula, Graff's Cluster, and planetary nebula IC 1295". astronomy.com. Retrieved 2020-10-05.
- ^ O'Meara, Stephen James (2007). Deep-Sky Companions: Hidden Treasures. Cambridge University Press. p. 457-458. ISBN 978-0521-83704-0.
- ^ Bagdonas, Vilius; Drazdauskas, Arnas; Tautvaišienė, Gražina; Smiljanic, Rodolfo; Chorniy, Yuriy (2018), "Chemical composition of giant stars in the open cluster IC 4756", Astronomy & Astrophysics, 615: A165, arXiv:1804.01975, Bibcode:2018A&A...615A.165B, doi:10.1051/0004-6361/201832695
External links[]
- Media related to IC 4756 at Wikimedia Commons
- IC 4756 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 18h 39m 04.9s, +05° 27′ 09″
Categories:
- IC objects
- Open clusters
- Serpens (constellation)
- Star cluster stubs