Data from the x-ray and γ-ray spectrometers onboard the Near Earth Asteroid Rendezvous (NEAR) Spacecraft were used to constrain the chemical and mineralogical composition of asteroid Eros. The S/Si ratio (0.014 +- 0.017) is consistent with complete loss of all S from the surface, while all other volatiles measured appear to be chondritic in abundance. We investigate space weathering mechanisms to determine the extent to which volatiles, especially S, can be preferentially lost from the surface regolith. Using impact data for Al projectiles onto enstatite, we find that the vaporization rate for sulfur is ～10 times faster than that for the bulk of the regolith.
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机译：来自X射线和γ射线光谱仪的数据靠近地球靠近地球小行星 - Rendezvous（近）航天器被用于约束小行星ERO的化学和矿物学组成。 S / Si比（0.014 + - 0.017）一致，符合来自表面的完全丧失，而测量的所有其他挥发物似乎是有丰富的软骨菌。我们研究了空间风化机制，以确定挥发物，尤其是S的程度，可以从表面易极性损失。利用Al射弹的影响数据在Enstatite上，我们发现硫磺的蒸发速率比大部分巨散的速度快〜10倍。
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