NGC 6709

NGC 6709
NGC 6709
觀測資料 (J2000 曆元)
星座	天鷹座
赤經	18h 51m 20.6s
赤緯	+10° 20′ 02″
距離	3,510 ly（1,075 pc）
視星等 (V)	6.7
視大小 (V)	13'
物理特徵
半徑	26 ly (tidal)
估計年齡	141 Myr
其他特徵	NGC 6709，Cr 392
	相關條目：疏散星團、NGC天體表

NGC 6709是赤道星座天鷹座中，位於恆星天市左垣六（也稱為「吳越」，天鷹座ζ）西南約5°處的一個疏散星團^[4]。它位於銀河系的中心方向^[5]距離地球3,510光年^[2]。

該星團的川普勒分類為IV 2 m，被認為是中等豐富^[5]擁有305顆^[6]恆星成員。它的年齡大約是1億4100萬年^[2]；與昴宿星團差不多^[6]。NGC 6709的核半徑為2.2 ly（0.68 pc），潮汐半徑為26.4 ly（8.08 pc）^[2]。它包含兩顆Be星，且其中一顆是殼層星。有一顆成員是紅巨星的候選者^[5]。

1984年11月13日傍晚，大衛·李維（英語：David H. Levy）在距離這個星團不到一度之處發現了他的第一顆彗星^[7]。

圖集

標示NGC 6709位置的星圖。

參考資料

^ ^1.0 ^1.1 Cantat-Gaudin, T.; Anders, F. Clusters and mirages: cataloguing stellar aggregates in the Milky Way. Astronomy & Astrophysics. January 2020, 633: 22. Bibcode:2020A&A...633A..99C. S2CID 208138247. arXiv:1911.07075 . doi:10.1051/0004-6361/201936691. A99.
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 Dib, Sami; et al. Structure and mass segregation in Galactic stellar clusters. Monthly Notices of the Royal Astronomical Society. January 2018, 473 (1): 849–859. Bibcode:2018MNRAS.473..849D. arXiv:1707.00744 . doi:10.1093/mnras/stx2413.
^ NGC 6709. SIMBAD. 斯特拉斯堡天文資料中心.
^ Crossen, Craig; Rhemann, Gerald. Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Vienna. 2012: 58. ISBN 9783709106266.
^ ^5.0 ^5.1 ^5.2 Subramaniam, Annapurni; Sagar, Ram. 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. February 1999, 117 (2): 937–961. Bibcode:1999AJ....117..937S. S2CID 34294008. doi:10.1086/300716.
^ ^6.0 ^6.1 Cole-Kodikara, Elizabeth M.; et al. 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. March 2021. Bibcode:2021csss.confE.175C. doi:10.5281/zenodo.4565515. 175.
^ Levy, David H. David Levy's Guide to Observing and Discovering Comets. Cambridge University Press. 2003: 52.

外部連結

維基共享資源上的相關多媒體資源：NGC 6709
NGC 6709 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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這是一篇與星團相關的小作品。您可以透過編輯或修訂擴充其內容。

[Cantat-Gaudin_Anders_2020-1] 1.0 ^1.1 Cantat-Gaudin, T.; Anders, F. Clusters and mirages: cataloguing stellar aggregates in the Milky Way. Astronomy & Astrophysics. January 2020, 633: 22. Bibcode:2020A&A...633A..99C. S2CID 208138247. arXiv:1911.07075 . doi:10.1051/0004-6361/201936691. A99.

[Dib_et_al_2018-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 Dib, Sami; et al. Structure and mass segregation in Galactic stellar clusters. Monthly Notices of the Royal Astronomical Society. January 2018, 473 (1): 849–859. Bibcode:2018MNRAS.473..849D. arXiv:1707.00744 . doi:10.1093/mnras/stx2413.

[simbad-3] NGC 6709. SIMBAD. 斯特拉斯堡天文資料中心.

[Crossen_Rhemann_2012-4] Crossen, Craig; Rhemann, Gerald. Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Vienna. 2012: 58. ISBN 9783709106266.

[Subramaniam_Sagar_1999-5] 5.0 ^5.1 ^5.2 Subramaniam, Annapurni; Sagar, Ram. 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. February 1999, 117 (2): 937–961. Bibcode:1999AJ....117..937S. S2CID 34294008. doi:10.1086/300716.

[Cole-Kodikara_et_al_2021-6] 6.0 ^6.1 Cole-Kodikara, Elizabeth M.; et al. 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. March 2021. Bibcode:2021csss.confE.175C. doi:10.5281/zenodo.4565515. 175.

[Levy-7] Levy, David H. David Levy's Guide to Observing and Discovering Comets. Cambridge University Press. 2003: 52.

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