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海女星

海女星
海女星,位於中央
发现
發現者卡爾·特奧多爾·羅伯特·路德
發現日期1852年4月17日
編號
命名依據忒提斯
其它名稱17 Thetis、A913 CA、A916 YF、1954 SO1
小行星分類主帶
形容詞Thetidian
軌道參數[1]
曆元 2004年10月22日(JD 2453300.5)
遠日點419.069 Gm (2.801 AU)
近日點319.991 Gm (2.139 AU)
半長軸369.530 Gm (2.470 AU)
離心率0.134
軌道週期1418.027 (3.88 a)
平均軌道速度18.87 km/s
平近點角38.435°
軌道傾角5.587°
升交點黃經125.622°
近日點參數135.906°
物理特徵
大小90 km[1]
質量1.2×1018 kg[2][3]
平均密度3.21 ± 0.92 g/cm³[2]
表面重力0.0252 m/s²
0.0476 km/s
自轉週期0.5113 d (12.27 h)[1][4]
反照率0.1715 [1][5]
溫度~173 K
光譜類型S-型小行星[1]
視星等9.89至13.51[6]
絕對星等(H)7.76[1]

海女星(英語:Thetis宽式IPA/ˈθitɪs/)是一顆大型的小行星,屬於反照率比較高的S-型小行星。於1852年4月17日被卡尔·特奥多尔·罗伯特·路德發現,也是他發現的第一顆小行星。海女星這個名稱是由希臘神話中的海洋女神忒提斯而來,祂也是阿基里斯的母親。

质量

通过测量灶神星海妖星对海女星的摄动可以测得其质量。2007年,Baer和Chesley测得海女星的质量约为1.2×1018千克[2][3],密度为3.21克/立方厘米。[2]

相關條目

參考文獻

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 JPL Small-Body Database Browser: 17 Thetis. 2008-08-04 [2008-11-12]. (原始内容存档于2020-08-03). 
  2. ^ 2.0 2.1 2.2 2.3 Baer, James; Steven R. Chesley. Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris (PDF). Celestial Mechanics and Dynamical Astronomy (Springer Science+Business Media B.V. 2007). 2007, 100 (2008): 27–42 [2008-11-12]. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8. (原始内容 (PDF)存档于2011-02-24). 
  3. ^ 3.0 3.1 (Mass of Thetis 0.00617 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.224E+18
  4. ^ LIGHTCURVES AND MAP DATA ON NUMBERED ASTEROIDS N° 1 TO 52225. AstroSurf. [2008-11-03]. (原始内容存档于2005-11-27). 
  5. ^ Asteroid Data Archive. Planetary Science Institute. [2008-11-03]. (原始内容存档于2006-06-23). 
  6. ^ 視星等 9.89 (1977-Jul-25) to 13.51 (1963-Aug-02) JPL Horizons页面存档备份,存于互联网档案馆) daily output for 1950 to 2099


前一小行星:
(16)靈神星
小行星列表 後一小行星:
(18)司曲星

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