NGC 6709
| NGC 6709 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Right ascension | 18h 51m 20.6s[1] |
| Declination | +10° 20′ 02″[1] |
| Distance | 3,510 ly (1,075 pc)[2] |
| Apparent magnitude (V) | 6.7 |
| Apparent dimensions (V) | 13' |
| Physical characteristics | |
| Radius | 26 ly[2] (tidal) |
| Estimated age | 141 Myr[2] |
| Other designations | NGC 6709, Cr 392[3] |
| Associations | |
| Constellation | Aquila |
NGC 6709 is an open cluster of stars in the equatorial constellation of Aquila, some 5° to the southwest of the star Zeta Aquilae.[4] It is situated toward the center of the galaxy[5] at a distance of 3,510 light-years.[2]
This cluster has a Trumpler class of IV 2 m, and is considered moderately rich[5] with 305[6] member stars. It is around 141[2] million years old; about the same as the Pleiades.[6] The core radius of NGC 6709 is 2.2 ly (0.68 pc) and the tidal radius 26.4 ly (8.08 pc).[2] It contains two Be stars and one of them is a shell star. There is one candidate red giant member.[5]
On the evening of November 13, 1984, David H. Levy discovered his first comet less than a degree from this cluster.[7]
Gallery
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Location diagram of NGC 6709
References
- ^ a b 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.
- ^ a b c d e f Dib, Sami; et al. (January 2018). "Structure and mass segregation in Galactic stellar clusters". Monthly Notices of the Royal Astronomical Society. 473 (1): 849–859. arXiv:1707.00744. Bibcode:2018MNRAS.473..849D. doi:10.1093/mnras/stx2413.
- ^ "NGC 6709". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-01-05.
- ^ Crossen, Craig; Rhemann, Gerald (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Vienna. p. 58. ISBN 9783709106266.
- ^ a b c Subramaniam, Annapurni; Sagar, Ram (February 1999). "Multicolor CCD Photometry and Stellar Evolutionary Analysis of NGC 1907, NGC 1912, NGC 2383, NGC 2384, and NGC 6709 Using Synthetic Color-Magnitude Diagrams". The Astronomical Journal. 117 (2): 937–961. Bibcode:1999AJ....117..937S. doi:10.1086/300716. S2CID 34294008.
- ^ a b Cole-Kodikara, Elizabeth M.; et al. (March 2021). NGC 6709: A Faint Zero-Age Main Sequence Open Cluster. The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5), virtually anywhere, March 2–4, 2021. Bibcode:2021csss.confE.175C. doi:10.5281/zenodo.4565515. 175.
- ^ Levy, David H. (2003). David Levy's Guide to Observing and Discovering Comets. Cambridge University Press. p. 52.
External links
Media related to NGC 6709 at Wikimedia Commons- NGC 6709 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- webda
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