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Pheobe, 来自KB<br />
土卫九 (Cassini spacecraft, Jul. 1 st 2004)<br />
轨道倾角175deg. 反照率 0.05 密度 1.6g cm -3<br />
冰 ice<br />
岩石 rock (>50%)<br />
黑色有机物质<br />
dark organic matter<br />
表面有水冰和干冰<br />
太阳系中最古老、<br />
最原始的天体之一<br />
45亿年
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