NGC 6709

NGC 6709
觀測資料 (J2000 曆元)
星座天鷹座
赤經18h 51m 20.6s[1]
赤緯+10° 20′ 02″[1]
距離3,510 ly（1,075 pc）[2]
視星等 (V)6.7
視大小 (V)13'
物理特徵
半徑26 ly[2] (tidal)
估計年齡141 Myr[2]
其他特徵NGC 6709，Cr 392[3]
相關條目：疏散星团、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。
    標示NGC 6709位置的星圖。

參考資料

  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 可免费查阅. doi:10.1051/0004-6361/201936691. A99. 
  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 可免费查阅. doi:10.1093/mnras/stx2413. 
  3. ^ NGC 6709. SIMBAD. 斯特拉斯堡天文資料中心. 
  4. ^ Crossen, Craig; Rhemann, Gerald. Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Vienna. 2012: 58. ISBN 9783709106266. 
  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. 
  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. 
  7. ^ Levy, David H. David Levy's Guide to Observing and Discovering Comets. Cambridge University Press. 2003: 52. 

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