Infrared spectroscopic observations of 69230 Hermes (1937 UB): possible unweathered endmember among ordinary chondrite analogs
Infrared spectroscopic observations of 69230 Hermes (1937 UB): possible unweathered endmember among ordinary chondrite analogs
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69230 Hermes (1937 UB) 的红外光谱观察：普通球粒陨石类似物中可能未风化的端元
DOI：
10.1016/j.icarus.2004.07.006
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发表时间：
2004
期刊：
影响因子：
3.2
通讯作者：
A. Saxena
中科院分区：
文献类型：
--
作者：
A. Rivkin;R. Binzel;J. Sunshine;S. Bus;T. Burbine;A. Saxena
我们使用位于莫纳克亚山的 NASA 红外望远镜设施获得了 Hermes (1937 UB) 的近红外（0.8–2.5 μm）光谱。我们发现 Hermes 具有与 L/LL 球粒陨石一致的光谱特性，与 Gaffey (1976, J. Geophys. Res. 81, 905) 平均 L6 球粒陨石具有很强的视觉相似性。我们使用改进的高斯方法（MGM：Sunshine 和 Pieters，1990，见：Lunar and Planetary Institute Conference Abstracts, p. 1223, 1993, J. Geophys. Res. 98, 9075）定义带面积比率 (RBA)，以量化缺乏可见分量的近红外小行星数据。 Hermes 的光谱与 (19356) 1997 GH3 几乎没有区别。这些小行星共同代表了从普通球粒陨石到大型主带 S 级小行星的光谱连续体中的新端成员。我们讨论了 Hermes 和其他可能的普通球粒陨石母体上可能发生的风化层效应，并将 Hermes 的反照率限制在 0.4 或更高（有效直径 650 m 或更小）（如果它有风化层）。该反照率/直径值与雷达结果一致。
We have obtained near-infrared (0.8–2.5 μm) spectra of Hermes (1937 UB) using the NASA Infrared Telescope Facility on Mauna Kea. We find Hermes to have spectral properties consistent with L/LL chondrites, with a strong visual similarity to Gaffey (1976, J. Geophys. Res. 81, 905) average L6 chondrites. We define a ratio of band areas (RBA) using the Modified Gaussian Method (MGM: Sunshine and Pieters, 1990, in: Lunar and Planetary Institute Conference Abstracts, p. 1223, 1993, J. Geophys. Res. 98, 9075) to quantify near-infrared asteroidal data lacking a visible component. Hermes has a spectrum nearly indistinguishable from (19356) 1997 GH3. Together, these asteroids represent new endmembers on the continuum of spectra from ordinary chondrite meteorites to large main-belt S-class asteroids. We discuss regolith effects that may be occurring on Hermes and other possible ordinary chondrite parent bodies, and constrain the albedo of Hermes to 0.4 or higher (effective diameter 650 m or smaller) if it has a regolith. This value for albedo/diameter is consistent with radar results.