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木卫十二

木衛十二(阿南刻)
發現
發現者 莊然風
發現於 1951年,9月28日
軌道
平均半徑 12,567,000km[1]
離心率 0.24[1]
近地點 12,567,000 km
遠地點 29,063,500 km
公轉週期 610.45 d (1.680 a)[1]
公轉速度 -
軌道傾角 黃道交角 148.89°
與木星赤道交角 149.9°[1]
木星 天然衛星之一
物理特徵
平均直徑 28km[2]
表面積 2500 km²
體積 11500 km³
質量 3.0×1016 kg
平均密度 3.014 g/cm³
表面重力 1.314 m/s2 (0.134 g)
逃逸速度 (可能)2.6 km/s
自轉週期 8.31 ± 0.15 h
反照率 (可能)0.04[2]
表面溫度 124K

木卫十二又稱為「阿南刻」(Ananke),是木星的其中一顆衛星,它是一颗逆行不規則卫星,在1951年被賽斯·尼克爾森威爾遜山天文台發現,[3]並命運女神阿南刻命名。

直到1975年前,[4]木卫十二也沒有一個正式的名稱,[5]它一直只有一個簡單的編號——「木星XII」。在1955年至1975年之間,人們叫它做阿德剌斯忒亚[6]而阿德剌斯忒亞現在是木星另一顆衛星木衛十五的名字。

軌道

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木衛十二的軌道非常奇特,不但離心率非常的高,而且軌道也非常傾斜(高達150°)因此它被歸為不規則衛星。

参考文献

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  1. ^ 1.0 1.1 1.2 1.3 Jacobson, R. A. The Orbits of Outer Jovian Satellites. Astronomical Journal. 2000, 120: pp. 2679–2686. doi:10.1086/316817. 
  2. ^ 2.0 2.1 Sheppard, S. S., Jewitt, D. C., Porco, C.; Jupiter's Outer Satellites and Trojans 互联网档案馆存檔,存档日期2007-06-14., in Jupiter: The Planet, Satellites and Magnetosphere, edited by Fran Bagenal, Timothy E. Dowling, William B. McKinnon, Cambridge Planetary Science, Vol. 1, Cambridge, UK: Cambridge University Press, ISBN 978-0-521-81808-7, 2004, pp. 263-280
  3. ^ Nicholson, S. B. An unidentified object near Jupiter, probably a new satellite. Publications of the Astronomical Society of the Pacific. 1951, 63 (375): 297–299 [2009-01-03]. doi:10.1086/126402. (原始内容存档于2018-06-12). 
  4. ^ Marsden, B. G. Satellites of Jupiter. IAUC Circular. 7 October 1974, 2846 [2009-01-03]. (原始内容存档于2020-06-02). 
  5. ^ Nicholson, S.B. S. B. Nicholson declines to name the satellites of Jupiter he has discovered. Publications of the Astronomical Society of the Pacific. April 1939, 51 (300): 85–94 [2009-01-03]. doi:10.1086/125010. (原始内容存档于2019-05-21). 
  6. ^ Payne-Gaposchkin, Cecilia; Katherine Haramundanis. Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. 1970. ISBN 0-134-78107-4. 
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木卫十二
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