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NGC 6755
NGC 6755 (taken from Stellarium)
Observation data (J2000 epoch)
Right ascension	19 07 46.1
Declination	+04° 13′ 26″
Distance	8,060 ly (2,471.2 pc)
Apparent magnitude (V)	7.5
Apparent dimensions (V)	15'
Physical characteristics
Estimated age	250 Myr
Other designations	NGC 6755, Cr 397
Associations
Constellation	Aquila
See also: Open cluster, List of open clusters

NGC 6755 is an open cluster of stars in the equatorial constellation of Aquila, positioned about 3° to the east of the star Delta Aquilae. It was discovered by the Anglo-German astronomer William Herschel on July 30, 1785 and is located at a distance of 8,060 light years from the Sun. NGC 6756 lies 30′ 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.

This cluster has a Trumpler class of II2r with a visual magnitude of 7.5 and it spans an angular size 15′. It has an estimated age of 250 million years, based on the main sequence turnoff. A total of 71 variable stars have been detected in the field of this cluster, of which 31 are eclipsing binaries, seven are pulsating variables, and 28 are most likely irregular variable red giants.

Gallery

• Map showing location of NGC 6755 (Roberto Mura)

References

1. ^ Cantat-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. S2CID 208138247. A99.
2. ^ O'Meara, Stephen James (2011). Deep-Sky Companions: The Secret Deep. Vol. 4. Cambridge University Press. p. 371. ISBN 9780521198769.
3. ^ Kjeldsen, 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.
4. "NGC 6755". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-04-25.
5. Seligman, Courtney. "NGC Objects: NGC 6750 - 6799". Celestial Atlas. Retrieved 2022-01-07.
6. 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

• Media related to NGC 6755 at Wikimedia Commons
• NGC 6755 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Constellation of Aquila
Aquila in Chinese astronomy Smith's Cloud List of stars in Aquila
Stars	Bayer α (Altair) β (Alshain) γ (Tarazed) δ ε ζ (Okab) η θ (Tseen Foo) ι κ λ μ ν ξ (Libertas) ο π σ τ υ φ χ ψ ω ω A b c d e f g h i k l Flamsteed 4 5 7 8 10 11 18 19 20 21 22 23 24 42 45 46 51 56 57 58 62 64 66 68 69 70 14 Sge 62 Ser 64 Sgr Variable R U V W TT FF QS V368 V450 V500 V603 V604 V605 V606 V923 V1286 V1291 V1298 V1302 V1315 V1333 V1339 V1427 V1428 V1429 V1472 V1487 V1494 V1654 V1672 V1691 V1703 (Phoenicia) V1828 V1936 HR 7099 7143 7288 7300 7307 7396 7456 7569 7598 7599 7693 7717 7803 HD 179079 183263 187734 192699 (Chechia) Other CoRoT-2 CoRoT-3 CoRoT-8 Gaia BH3 HAT-P-41 PSR J1856+0245 PSR J1903+0327 PSR B1913+16 (Hulse–Taylor) PSR J1951+1123 SGR 1900+14 SS 433 W43A W49-2 WASP-80 (Petra) WD J1953−1019 ZTF J1901+1458
Exoplanets CoRoT-2b CoRoT-3b CoRoT-8b CoRoT-10b HD 179079 b HD 183263 b c HD 192263 b HD 192699 b ξ Aquilae b
Star clusters NGC 6709 NGC 6738 NGC 6755 NGC 6756 NGC 6760
Nebulae	NGC 6741 6751 6778 6781 6790 Other Abell 48 Abell 70 E Nebula Hen 2-428 HESS J1857+026 W43 W49 W49B W50
Galaxies	NGC 6814 Other IC 1327
Category

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