卡俄斯 (天体)

19521 Chaos (astrological)
19521 Chaos as imaged by the Hubble Space Telescope in September 2001
发现
發現者深度黃道勘測計畫
發現日期1998年11月19日
編號
命名依據混沌
其它名稱1998 WH24
小行星分類外海王星天體 (傳統古柏帶天體)[1][2]
形容詞Chaotian /keɪˈoʊʃən/[3]
軌道參數[6]
曆元 13 January 2016 (JD 2457400.5)
不確定參數 3
觀測弧5902 days (16.16 yr)
遠日點50.636 AU（7.5750 T米）
近日點40.957 AU（6.1271 T米）
半長軸45.796 AU（6.8510 T米）
離心率0.10567
軌道週期309.92 yr (113199 d)
平均軌道速度4.3931 km/s
平近點角337.2998°
軌道傾角12.0502°
升交點黃經50.0239°
近心點時間≈ 23 December 2033[4]
±10 days
近日點參數58.4097°
與木星最小軌道相交距離35.8 AU（5.36 T米）
與海王星最小軌道相交距離12.5 AU（1.87 T米）[5]
物理特徵
大小612 km (est. at 0.05)[7]
600+140
−130 km [8]
~665 [9]
幾何反照率0.050+0.030
−0.016 [8]
光譜類型B–V=0.95±0.03 [9]
V–R=0.63±0.03 [9]
V–I=1.25±0.04 [9]
絕對星等(H)4.8 [6]
5.0 [7][9]

卡俄斯（小行星19521，1998 WH24）是一顆外海王星天體，被分類為QB1天體。當時是被基特峰國立天文臺4米口徑的望遠鏡所發現的，後來以希臘神話中的原始神混沌（即卡俄斯）來命名該天體。

物理性質

卡俄斯反照率是0.050+0.030
−0.016,[8]，絕對星等(H) 為 4.8，直徑[6] 600+140
−130 公里[8]。

2020年11月20日，卡俄斯遮蔽了一顆 16.8星等的恆星。三位觀察者觀測掩星，發現該天體的直徑可能小於600公里[10]。2022年1月14日，天文學家記錄了另一次掩星； 關於該天體的大小、形狀、幾何反照率和自旋軸方向的完整結果尚未發布。2023年9月28日發生另一次掩星，可觀測區域穿過北美洲大部分地區。 超過30位觀測者觀測到了這次掩星[11].。

參考資料

  1. ^ MPEC 2008-O05 : Distant Minor Planets (2008 AUG. 2.0 TT). Minor Planet Center. 17 July 2008 [2011-01-08]. （原始内容存档于2020-10-04）. 
  2. ^ Buie, Marc W. Orbit Fit and Astrometric record for 19521. Space Science Department. SwRI. 2004-11-09 [2008-09-28]. （原始内容存档于2023-11-19）. 
  3. ^ Thayer. Gray World, Green Heart需要免费注册. Wiley. 1994. ISBN 9780471572732.  Template:Full citation
  4. ^ JPL Horizons （页面存档备份，存于互联网档案馆） Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is 3-sigma.)
  5. ^ (19521) Chaos = 1998 WH24 orbit. IAU Minor Planet Center. [2018-02-10]. （原始内容存档于2022-12-06）. 
  6. ^ 6.0 6.1 6.2 19521 Chaos (1998 WH24). JPL Small-Body Database Browser (2007-12-14 last obs). [11 April 2016]. （原始内容存档于2018-02-10）. 
  7. ^ 7.0 7.1 Brown, Michael E. How many dwarf planets are there in the outer solar system? (updates daily). California Institute of Technology. [25 Dec 2018]. （原始内容存档于2020-03-06）. 
  8. ^ 8.0 8.1 8.2 8.3 Vilenius, E.; Kiss, C.; Mommert, M.; Müller, T.; Santos-Sanz, P.; Pal, A.; et al. "TNOs are cool": A survey of the trans-Neptunian region VI. Herschel / PACS observations and thermal modeling of 19 classical Kuiper belt objects. Astronomy and Astrophysics. 2012, 541: A94. Bibcode:2012A&A...541A..94V. S2CID 54222700. arXiv:1204.0697v1 可免费查阅. doi:10.1051/0004-6361/201118743. 
  9. ^ 9.0 9.1 9.2 9.3 9.4 Doressoundiram, A.; Peixinho, N.; de Bergh, C.; Fornasier, S.; Thébault, Ph.; Barucci, M.A.; Veillet, C. The color distribution in the Edgeworth-Kuiper Belt. The Astronomical Journal. October 2002, 124 (4): 2279–2296. Bibcode:2002AJ....124.2279D. S2CID 30565926. arXiv:astro-ph/0206468 可免费查阅. doi:10.1086/342447. 
  10. ^ Vara-Lubiano, Mónica; Morales, Nicolás; Rommel, Flavia; Ortiz, José Luis; Sicardy, Bruno; Santos-Sanz, Pablo; et al. The multi-chord stellar occultation by (19521) Chaos on 2020 November 20. 15th Europlanet Science Congress 2021. Europlanet Society. September 2021 [26 June 2022]. Bibcode:2021EPSC...15..626V. doi:10.5194/epsc2021-626. EPSC2021-626. （原始内容存档于2023-11-14）. 
  11. ^ Gault, Dave. 存档副本. OccultWatcher. [29 September 2023]. （原始内容存档于2023-11-14）. 
引用错误：在<references>标签中name属性为“Ortiz2022”的参考文献没有在文中使用

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