NGC 6755
| NGC 6755 | |
|---|---|
 NGC 6755 (taken from Stellarium) | |
| Observation data (J2000epoch) | |
| Right ascension | 19h07m46.1s[1] |
| Declination | +04° 13′ 26″[1] |
| Distance | 8,060ly(2,471.2pc)[1] |
| Apparent magnitude(V) | 7.5[2] |
| Apparent dimensions (V) | 15'[2] |
| Physical characteristics | |
| Estimated age | 250 Myr[3] |
| Other designations | NGC6755,Cr397[4] |
| Associations | |
| Constellation | Aquila |
NGC 6755is anopen clusterof stars in theequatorialconstellationofAquila,positioned about 3° to the east of the starDelta Aquilae.[2]It was discovered by the Anglo-German astronomerWilliam Herschelon July 30, 1785[5]and is located at a distance of 8,060light yearsfrom theSun.[1]NGC 6756lies30′to the northeast of NGC 6755, with the pair forming a visual double cluster. However, they probably do not form a binary cluster system since they have different ages and are too distant from each other.[2]
This cluster has aTrumpler classof II2r with avisual magnitudeof 7.5 and it spans anangular size15′.[2]It has an estimated age of 250 million years, based on themain sequence turnoff.[3]A total of 71variable starshave been detected in the field of this cluster, of which 31 areeclipsing binaries,seven arepulsating variables,and 28 are most likelyirregular variablered giants.[6]
Gallery
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Map showing location of NGC 6755 (Roberto Mura)
References
[edit]- ^abcdCantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way".Astronomy & Astrophysics.633:22.arXiv:1911.07075.Bibcode:2020A&A...633A..99C.doi:10.1051/0004-6361/201936691.S2CID208138247.A99.
- ^abcdeO'Meara, Stephen James (2011).Deep-Sky Companions: The Secret Deep.Vol. 4. Cambridge University Press. p. 371.ISBN9780521198769.
- ^abKjeldsen, H.; Frandsen, S. (January 1991). "Stellar photometric stability. II. Ages and distances for 13 open clusters with time series observations".Astronomy and Astrophysics, Supplemental Series.87:119.Bibcode:1991A&AS...87..119K.
- ^"NGC 6755".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2007-04-25.
- ^Seligman, Courtney."NGC Objects: NGC 6750 - 6799".Celestial Atlas.Retrieved2022-01-07.
- ^Ciechanowska, A.; et al. (September 2007). "The Optical Gravitational Lensing Experiment. Variable Stars in the Field of Open Cluster NGC 6755".Acta Astronomica.57:249–266.Bibcode:2007AcA....57..249C.
External links
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Media related toNGC 6755at Wikimedia Commons- NGC 6755 onWikiSky:DSS2,SDSS,GALEX,IRAS,Hydrogen α,X-Ray,Astrophoto,Sky Map,Articles and images
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