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小行星174567

Varda
发现[2]
發現者杰弗里·A·拉森[1]
發現日期2003年6月21日
編號
MPC編號2003 MW12
其它名稱暂无
小行星分類海王星外天体(QB1天体)[3]
黄道离散天体[4]
軌道參數[2]
曆元 2006年12月31日 (JD 2454100.5)
遠日點7 821.517 Gm (52.284 AU)
近日點5 927.302 Gm (39.622 AU)
半長軸6 874.410 Gm (45.953 AU)
離心率0.138
軌道週期113 779.342 d (311.51 a)
平均軌道速度4.37 km/s
平近點角257.434°
軌道傾角21.494°
升交點黃經184.009°
近日點參數181.811°
物理特徵
大小500–1130 km[2][5]
838 km(估计值)[6]
質量6.1×1020? kg
(估计值)
平均密度2.0? g/cm3
表面重力0.2138? m/s2
0.4044? km/s
恆星週期? d
反照率0.09?(估计值)
溫度~41 K
光譜類型?
視星等20.5[7]
絕對星等(H)3.4[2]

(174567) 瓦爾妲 (2003 MW12)是一颗海王星外天体绝对星等为3.4[2]。它很有可能成为一颗矮行星。它由杰弗里·A·拉森于2003年6月21日通过太空监视望远镜发现[8]

它目前距离太阳47.5天文单位[7],将于2096年11月到达近日点[4][9]。它在14次时已被观测到58次,最早的照片可追溯到1980年[2]

迈克尔·E·布朗自动更新的网站将它列为很有可能的矮行星,但它的直径至今还没有测得[10]

命名

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該小行星以J·R·R·托爾金作品《精靈寶鑽》中的人物瓦爾妲命名。[11]

卫星

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天文学家于2009年发现瓦爾妲至少拥有1颗卫星:这颗卫星以J·R·R·托爾金作品中邁雅之首,瓦爾妲的婢女伊爾瑪瑞命名。如果假设其密度和反照率与瓦爾妲相同,那它的直径约为350千米(即瓦爾妲的50%),占系统质量的8%,或2×1019 千克。伊爾瑪瑞离瓦爾妲非常近,轨道半长轴仅为4809±39 千米(12倍瓦爾妲半径),轨道周期为5.75天。[12]

参考资料

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  1. ^ List Of Transneptunian Objects 互联网档案馆存檔,存档日期2008-10-15.
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 JPL Small-Body Database Browser: 174567 (2003 MW12). 2007-06-14 [2008-12-08]. (原始内容存档于2019-09-25). 
  3. ^ MPEC 2009-P26 :Distant Minor Planets (2009 AUG. 17.0 TT). Minor Planet Center. 2009-08-07 [2009-08-24]. (原始内容存档于2010-04-10). 
  4. ^ 4.0 4.1 Marc W. Buie. Orbit Fit and Astrometric record for 174567. SwRI (Space Science Department). 2008-04-15 [2009-08-24]. (原始内容存档于2020-11-28). 
  5. ^ Absolute Magnitude (H). NASA/JPL. [2008-12-07]. (原始内容存档于2008-05-14). 
  6. ^ Wm. Robert Johnston. List of Known Trans-Neptunian Objects. Johnston's Archive. [2008-12-07]. (原始内容存档于2011-02-05). 
  7. ^ 7.0 7.1 AstDys (174567) 2003MW12 Ephemerides. Department of Mathematics, University of Pisa, Italy. [2009-03-22]. (原始内容存档于2009-04-18). 
  8. ^ Larsen, Jeffrey A.; Roe, Eric S.; Albert, C. Elise et al.. The Search for Distant Objects in the Solar System Using Spacewatch. The Astronomical Journal. 2007, 133 (4): 1247–1270. Bibcode:2007AJ....133.1247L. doi:10.1086/511155. 
  9. ^ HORIZONS Web-Interface. JPL Solar System Dynamics. [2009-08-24]. (原始内容存档于2020-10-29).  外部链接存在于|publisher= (帮助)
  10. ^ Michael E. Brown. How many dwarf planets are there in the outer solar system? (updates daily). California Institute of Technology. [2011-08-25]. (原始内容存档于2011-10-18). 
  11. ^ (174567) Varda = 2003 MW12. The Minor Planet Center. [2018-08-27]. (原始内容存档于2017-08-17) (英语). 
  12. ^ Grundy, W. M.; Porter, S. B.; Benecchi, S. D.; Roe, H. G.; Noll, K. S.; Trujillo, C. A.; et al. The mutual orbit, mass, and density of the large transneptunian binary system Varda and Ilmarë. Icarus. September 2015, 257: 130–138. Bibcode:2015Icar..257..130G. S2CID 44546400. arXiv:1505.00510可免费查阅. doi:10.1016/j.icarus.2015.04.036. 

外部链接

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前一小行星:
(174566) 2003 KT16
小行星列表 後一小行星:
(174568) 2003 NO12
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小行星174567
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