Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids

Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids
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一组近地和穿越火星小行星的表面组成和分类

DOI:
10.1016/j.icarus.2013.02.036
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发表时间:
2013
期刊:
影响因子:
3.2
通讯作者:
Andreas
Andreas
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sanchez;Juan A;Michelsen;Vishnu;Nathues;Andreas

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过去,由于缺乏包含矿物学诊断吸收带的高质量近红外光谱数据(0.72.5μm),限制近地小行星表面成分一直是困难的。在这里,我们给出了9个近地天体和5个穿越火星的小行星的可见光(∼0.43-0.95μm)和近红外(∼0.7-2.5μm)光谱。所研究的近地环境评估是:4055麦哲伦、19764(2000年净额5)、89830(2002年CE)、138404(2000年HA24)、143381(2003BC21)、159609(2002AQ3)、164121(2003年YT1)、241662(2000年KO44)和2007年ML13。所研究的MC是:1656Suomi,2577 Litva,5407(1992年AX),22449 Ottijef和47035(1998年WS)。观测是用智利拉西拉的NTT、西班牙卡拉阿尔托的2.2米望远镜和夏威夷莫纳克亚的IRTF进行的。对小行星的分类(总线制)表明,所有观测到的MC小行星都属于S杂岩,包括S、Sr和Sl类。其中7个近地天体属于S杂岩,包括S、Sa、Sk和Sl类,2个近地天体被归类为V型。NEA 164121(2003YT1)是根据其近红外光谱将其分类为V型的,因为这颗小行星没有可见光光谱。对其中6颗小行星(已获得或以前获得近红外光谱的小行星)进行了矿物学分析。我们发现有三颗小行星(241662(2000KO44)、19764(2000NF5)、138404(2000HA24)具有与普通球粒陨石一致的镁铁质硅酸盐成分,而另外三颗小行星(4055Magellan、164121(2003YT1)、5407(1992年AX))则是辉石为主的玄武质无球粒陨石组合。在5407(1992 AX)的例子中,我们发现它的玄武岩表面成分与其分类上的S型形成了鲜明对比。
In the past, constraining the surface composition of near-Earth asteroids (NEAs) has been difficult due to the lack of high quality near-IR spectral data (0.7–2.5μm) that contain mineralogically diagnostic absorption bands. Here we present visible (∼0.43–0.95μm) and near-infrared (∼0.7–2.5μm) spectra of nine NEAs and five Mars-crossing asteroids (MCs). The studied NEAs are: 4055 Magellan, 19764 (2000 NF5), 89830 (2002 CE), 138404 (2000 HA24), 143381 (2003 BC21), 159609 (2002 AQ3), 164121 (2003 YT1), 241662 (2000 KO44) and 2007 ML13. The studied MCs are: 1656 Suomi, 2577 Litva, 5407 (1992 AX), 22449 Ottijeff and 47035 (1998 WS). The observations were conducted with the NTT at La Silla, Chile, the 2.2m telescope at Calar Alto, Spain, and the IRTF on Mauna Kea, Hawai’i. The taxonomic classification (Bus system) of asteroids showed that all observed MC asteroids belong to the S-complex, including the S, Sr and Sl classes. Seven of the NEAs belong to the S-complex, including the S, Sa, Sk and Sl classes, and two NEAs were classified as V-types. The classification of the NEA 164121 (2003 YT1) as a V-type was made on the basis of its near-infrared spectrum since no visible spectrum is available for this asteroid. A mineralogical analysis was performed on six of the asteroids (those for which near-IR spectra were obtained or previously available). We found that three asteroids (241662 (2000 KO44), 19764 (2000 NF5), 138404 (2000 HA24)) have mafic silicate compositions consistent with ordinary chondrites, while three others (4055 Magellan, 164121 (2003 YT1), 5407 (1992 AX)) are pyroxene-dominated basaltic achondrite assemblages. In the case of 5407 (1992 AX) we found that its basaltic surface composition contrasts its taxonomic classification as a S-type.
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