希佩里昂的表面组成
D P Cruikshank1, J B Dalton, C M Dalle Ore
1NASA Ames Research Center, MS 245-6, NASA Ames Research Center, MS 211-3, Moffett Field, California 94035, USA. Dale.P.Cruikshank@nasa.gov
Nature
|July 6, 2007
概括
土星的卫星Hyperion有两个不同的表面材料. 石坑中的低度物质与土星的卫星菲比和雅佩图斯有光谱相似之处.
科学领域:
- 行星科学 行星科学
- 天文地质学 天文地质学
- 频谱学是一种光谱学.
背景情况:
- 希佩里昂是土星的第八大卫星,以不规则的形状和混乱的旋转为特征.
- 它的表面表现出两个主要单位:一个富含水冰的高阿尔贝多元件和一个在石坑中发现的低阿尔贝多元件.
研究的目的:
- 在紫外线和近红外线区域分析Hyperion表面成分的光谱特性.
- 为了确定Hyperion上的低白度物质的组成和潜在来源.
主要方法:
- 使用了卡西尼号航天器上的两个光学遥感仪器.
- 在2005年9月25日至26日近距离飞行期间获得的Hyperion表面的反射频谱.
主要成果:
- 获得了高和低阿尔贝多表面材料的明显的紫外线和近红外光谱.
- 低阿尔贝多的物质与菲比和雅佩图斯的表面有光谱相似之处.
结论:
- 希佩里昂的低白度物质可能有共同的起源或与菲比和雅佩图斯发现的物质有关.
- 进一步调查这些土星卫星之间的组成联系是有必要的.
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