IC 4756
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 | |
|---|---|
 | |
| 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 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]
Open star clusters IC 4756 (left) and NGC 6633. Original astrophoto.
References
- "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
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