小行星511

511 Davida
发现
發現者雷蒙德·史密斯·杜根
發現地海德堡
發現日期1903年5月30日
編號
MPC編號511
命名依據戴维·派克·托德
其它名稱1903 LU
小行星分類主带小行星
軌道參數[1]
曆元 2011年8月27日
遠日點3.756248648409183AU
近日點2.573238753155234AU
半長軸3.164743700782208AU
離心率0.1869045343168789
軌道週期2056.393597432006地球日
5.63地球年
平近點角202.8654848104376°
軌道傾角15.9422470280428°
升交點黃經107.6361734400256°
近日點參數338.1780969718919°
物理特徵
大小289±21千米（357±2 × 294±2 × 231±50)[2]
質量3.84±0.20 × 1019千克[3]
平均密度3.45±1.51 g/cm³[3]
自轉週期5.131小时
反照率0.0540
溫度~160K
光譜類型C
視星等9.50[4]-12.98
絕對星等(H)6.22

小行星511（511 Davida），是由美国天文学家雷蒙德·史密斯·杜根于1903年5月30日在德国海德堡王座山天文台发现的主带小行星。它是一颗体积相当大的C-型小行星，直径约为289±21千米，是目前已知在海王星轨道内第七大的小行星，仅次于谷神星、灶神星、智神星、健神星、小行星704和欧女星。它的质量大约占整个小行星带质量总和的1.5%[3][5][6]。

小行星511以美国马萨诸塞州的私立学院安默斯特学院天文学教授戴维·派克·托德命名。

外型

小行星511是少量几颗外型由地面光学望远镜观测确定的主带小行星。2002年至2007年，凯克天文台的天文学家利用具有自适应光学系统的凯克Ⅱ号望远镜对小行星511进行照相并研究其外型。小行星511并不符合矮行星的要求：它的表面至少有两个突出的尖端和至少一个和完美椭球体有15千米偏差的平坦面。这个面是可能是一个直径约150千米的撞击坑，在梅西尔德星（小行星253）也可以看到类似结构。

质量

2001年，Michalak等人估计小行星511的质量是(6.64±0.56)× 1019千克[7][8] 2007年，Baer和Chesley经过计算认为小行星511的质量为(5.9±0.6)× 1019千克[9]。而到了2010年，Baer经过重新修正后计算出小行星511的质量是(3.84±0.20))× 1019千克[3]。这就意味小行星511的质量被小行星704超过，成为目前已知海王星轨道内第六重的小行星（不过这个质量的误差区间和小行星704的有一点重叠）[3]。

参考资料

  1. ^ 511 Davida (1903 LU). [2011-08-17]. （原始内容存档于2021-01-28）. 
  2. ^ Conrad (2007). Measurements of the short axis are less precise than the other two, but also involve a discrepancy between fitting the convolved and deconvolved images (241±40 km), and fitting the edges (191±114 km).
  3. ^ 3.0 3.1 3.2 3.3 3.4 Baer, James. Recent Asteroid Mass Determinations. Personal Website. 2010 [2011-02-13]. （原始内容存档于2013-07-08）. 
  4. ^ Bright Minor Planets 2003. Minor Planet Center. [2008-05-21]. （原始内容存档于2011-05-19）. 
  5. ^ Pitjeva, E. V. High-Precision Ephemerides of Planets—EPM and Determination of Some Astronomical Constants (PDF). Solar System Research. 2005, 39 (3): 176. Bibcode:2005SoSyR..39..176P. doi:10.1007/s11208-005-0033-2. （原始内容 (PDF)存档于2014-07-03）. 
  6. ^ "Baer Mass of 511 Davida" 0.220 / "Mass of Mbelt" 15 = 0.0146
  7. ^ Michalak, G. Determination of asteroid masses (6) Hebe, (10) Hygiea, (15) Eunomia, (52) Europa, (88) Thisbe, (444) Gyptis, (511) Davida and (704) Interamnia. Astronomy & Astrophysics. 2001, 374: 703–711 [2008-11-04]. Bibcode:2001A&A...374..703M. doi:10.1051/0004-6361:20010731. （原始内容存档于2012-12-04）. 
  8. ^ (3.34±0.28)×10−11 solar masses, per Michalak (2001), extended dynamic model
  9. ^ 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 [2008-11-15]. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8. （原始内容 (PDF)存档于2011-02-24）.  : = (2.98±0.30)×10−11*solar masses

外部链接


前一小行星：
(510)小行星510 		小行星列表 後一小行星：
(512)小行星512

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