EXPLORENEOs. I. DESCRIPTION AND FIRST RESULTS FROM THE WARM SPITZER NEAR-EARTH OBJECT SURVEY
EXPLORENEOs. I. DESCRIPTION AND FIRST RESULTS FROM THE WARM SPITZER NEAR-EARTH OBJECT SURVEY
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探索NEO。
DOI：
10.1088/0004-6256/140/3/770
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. Thomas
中科院分区：
文献类型：
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作者：
D. Trilling;M. Mueller;J. Hora;Alan W. Harris;B. Bhattacharya;W. Bottke;Steve Chesley;M. Delbo’;J. Emery;Giovanni G. Fazio;A. Mainzer;B. Penprase;Howard A. Smith;T. Spahr;J. Stansberry;C. Thomas
我们已经开始了探索近地天体项目，在该项目中，我们用斯皮策空间望远镜的温暖斯皮策模式观测了大约700个3.6和4.5微米的近地天体。从这些测量和目录光学光度学，我们得出了所观察到的目标的半径和直径。我们的ExploreNEOs方案的总体目标是通过推导大量近地天体的物理特性来研究近地空间的历史。在本文中，我们描述了我们的ExploreNEOs计划的科学和技术结构。我们提出了我们的观测，光度和热建模技术。我们目前的结果，从第一个101个目标观察到在这个程序。我们发现，第一个样本中的近地天体分布相当广泛，这可能表明近地天体群的组成范围很广。许多小于1公里的天体都有高折射率（0.35），但大于1公里的天体很少有高折射率。这一结果与以下观点相一致：这些较大的天体在碰撞时较老，因此其表面在空间中风化程度更高，因此颜色更深，或者不像较小的近地天体那样频繁地发生其他表面再生事件。
We have begun the ExploreNEOs project in which we observe some 700 Near-Earth Objects (NEOs) at 3.6 and 4.5 μm with the Spitzer Space Telescope in its Warm Spitzer mode. From these measurements and catalog optical photometry we derive albedos and diameters of the observed targets. The overall goal of our ExploreNEOs program is to study the history of near-Earth space by deriving the physical properties of a large number of NEOs. In this paper, we describe both the scientific and technical construction of our ExploreNEOs program. We present our observational, photometric, and thermal modeling techniques. We present results from the first 101 targets observed in this program. We find that the distribution of albedos in this first sample is quite broad, probably indicating a wide range of compositions within the NEO population. Many objects smaller than 1 km have high albedos (≳0.35), but few objects larger than 1 km have high albedos. This result is consistent with the idea that these larger objects are collisionally older, and therefore possess surfaces that are more space weathered and therefore darker, or are not subject to other surface rejuvenating events as frequently as smaller NEOs.