X-ray Fluorescence Spectrometry of Asteroid Itokawa by Hayabusa
X-ray Fluorescence Spectrometry of Asteroid Itokawa by Hayabusa
复制标题
隼鸟号对糸川小行星的 X 射线荧光光谱测量
作者：
T. Okada;K. Shirai;Yukio Yamamoto;T. Arai;K. Ogawa;K. Hosono;Manabu Kato
在2005年11月19日第一次着陆期间，隼鸟号小行星25143 Itokawa的X射线荧光光谱测定是由隼鸟号上的X射线光谱仪进行的。我们选择在相对增强的太阳活动期间观测到的数据，并确定Mg/Si = 0.78 ± 0.09和Al/Si = 0.07 ± 0.03的平均元素质量比。我们的初步结果表明，Itokawa的成分与普通的无球粒陨石一致，但不能排除原始的无球粒陨石。在普通的钙离子中，LL-或L-钙离子似乎比H-钙离子更有可能。在小行星表面没有发现实质性的区域差异，表明其组成是同质的。
X-ray fluorescence spectrometry of asteroid 25143 Itokawa was performed by the x-ray spectrometer onboard Hayabusa during the first touchdown on 19 November 2005. We selected those data observed during relatively enhanced solar activity and determined average elemental mass ratios of Mg/Si = 0.78 ± 0.09 and Al/Si = 0.07 ± 0.03. Our preliminary results suggest that Itokawa has a composition consistent with that of ordinary chondrites, but primitive achondrites cannot be ruled out. Among ordinary chondrites, LL- or L-chondrites appear to be more likely than H-chondrites. No substantial regional difference was found on the asteroid surface, indicating its homogeneity in composition.