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首页> 外文期刊>Planetary and space science >A newly discovered impact crater in Titan's Senkyo: Cassini VIMS observations and comparison with other impact features
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A newly discovered impact crater in Titan's Senkyo: Cassini VIMS observations and comparison with other impact features

机译：泰坦神峡中一个新发现的撞击坑：卡西尼号VIMS观测结果以及与其他撞击特征的比较

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摘要

Senkyo is an equatorial plain on Titan filled with dunes and surrounded by hummocky plateaus. During the Titan targeted flyby T61 on August 25, 2009, the Cassini Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini spacecraft observed a circular feature, centered at 5.4° N and 341 °W, that superimposes the dune fields and a bright plateau. This circular feature, which has been named Paxsi by the International Astronomical Union, is 120 + 10 km in diameter (measured from the outer edge of the crater rim) and exhibits a central bright area that can be interpreted as the central peak or pit of an impact crater. Although there are only a handful of certain impact craters on Titan, there are two other craters that are of similar size to this newly discovered feature and that have been studied by VIMS: Sinlap (Le Mouelic et al., 2008) and Selk (Soderblom et al., 2010). Sinlap is associated with a large downwind, fan-like feature that may have been formed from an impact plume that rapidly expanded and deposited icy particles onto the surface. Although much of the surrounding region is covered with dunes, the plume region is devoid of dunes. The formation process of Selk also appears to have removed (or covered up) dunes from parts of the adjacent dune-filled terrain. The circular feature on Senkyo is quite different: there is no evidence of an ejecta blanket and the crater itself appears to be infilled with dune material. The rim of the crater appears to be eroded by fluvial processes; at one point the rim is breached. The rim is unusually narrow, which may be due to mass wasting on its inside and subsequent infill by dunes. Based on these observations, we interpret this newly discovered feature to be a more eroded crater than both Sinlap and Selk. Paxsi may have formed during a period when Titan was warmer and more ductile than it is currently.
机译：仙京是位于泰坦的赤道平原，山丘上布满沙丘，被丘陵高原所环绕。在2009年8月25日泰坦目标飞越T61的过程中，卡西尼号飞船上的卡西尼视觉和红外测绘光谱仪（VIMS）观测到一个圆形特征，中心位于5.4°N和341°W，与沙丘场和明亮的高原重叠。这个圆形特征被国际天文学联合会（International Astronomical Union）命名为Paxsi，直径为120 + 10 km（从火山口边缘的外边缘测量），并显示出一个中心明亮区域，该区域可以解释为中心峰或坑撞击坑。尽管土卫六上只有少数某些撞击坑，但还有另外两个与这个新发现的陨石坑大小相似的坑，并已被VIMS研究：Sinlap（Le Mouelic et al。，2008）和Selk（Soderblom等（2010）。 Sinlap与大型顺风风扇状特征相关，该特征可能是由撞击羽流形成的，该撞击羽流迅速膨胀并将冰状颗粒沉积到表面上。尽管周围的许多区域都被沙丘覆盖，但羽状区域没有沙丘。 Selk的形成过程似乎还从相邻的沙丘填充地形的一部分中去除（或掩盖了）沙丘。 Senkyo上的圆形特征完全不同：没有证据显示弹出毯，而且火山口本身似乎充满了沙丘材料。火山口的边缘似乎被河流冲蚀。一方面，篮圈被打破。轮缘异常狭窄，可能是由于轮圈内部质量过大以及随后沙丘填充所致。基于这些观察，我们将这个新发现的特征解释为比Sinlap和Selk都更易腐蚀的陨石坑。 Paxsi可能是在土卫六比现在更暖和更易延展的时期形成的。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.18-25|共8页
  • 作者

    B.J. Buratti; C. Sotin; K. Lawrence; R.H. Brown; S. Le Mouelic; J.M. Soderblom; J. Barnes; R.N. Clark; K.H. Baines; P.D. Nicholson;

  • 作者单位

    Jet Propulsion Laboratory, Mail stop 183-401, Pasadena, CA 91109, USA;

    Jet Propulsion Laboratory, Mail stop 183-401, Pasadena, CA 91109, USA;

    Jet Propulsion Laboratory, Mail stop 183-401, Pasadena, CA 91109, USA;

    Dept. Planet. Sci and IPl, U. of AZ, Tucson, AZ 85721-0092, USA;

    Laboratoire de Planetologie et Geodynamique, CNRS, UMR 6112, Universite de Nantes, France;

    Dept. Planet. Sci and IPl, U. of AZ, Tucson, AZ 85721-0092, USA;

    University of Idaho, Department of Physics, Moscow, ID 83844, USA;

    USCS, Mail Stop 964, Box 25046, Denver Federal Center, Denver, CO 80225, USA;

    SSEC University of Wisconsin, Madison, WI 53706, USA;

    Department of Astronomy, Cornell University, Ithaca, NY 14853, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    titan; surfaces; craters;

    机译：泰坦表面;火山口;

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