The Size Distribution of Near-Earth Objects Larger Than 10 m
The Size Distribution of Near-Earth Objects Larger Than 10 m
复制标题
大于10 m的近地天体的尺寸分布
DOI：
10.3847/1538-3881/aa8036
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
J. Rajagopal
中科院分区：
文献类型：
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作者：
D. Trilling;D. Trilling;F. Valdes;L. Allen;David E. James;C. Fuentes;D. Herrera;T. Axelrod;J. Rajagopal
我们分析了第一年近地天体调查的数据，我们正在使用Cerro Tololo美洲天文台4米布兰科望远镜上的暗能量相机（DECam）进行调查。我们将人造近地物体植入数据流，以得出我们夜间探测效率与大小和运动速度的函数关系。利用这些测得的效率和小行星中心对探测到的235个独特近地天体进行的1377次测量得出的太阳系绝对星等，我们首次从单一观测数据集直接得出了从1公里到10米的近地天体大小分布。我们发现有大于10米的近地天体。这一结果意味着小型近地天体比以前的一些结果少了10倍，不过我们得出的大小分布与其他几种估计非常吻合。
We analyzed data from the first year of a survey for Near-Earth Objects (NEOs) that we are carrying out with the Dark Energy Camera (DECam) on the 4 m Blanco telescope at the Cerro Tololo Inter-American Observatory. We implanted synthetic NEOs into the data stream to derive our nightly detection efficiency as a function of magnitude and rate of motion. Using these measured efficiencies and the solar system absolute magnitudes derived by the Minor Planet Center for the 1377 measurements of 235 unique NEOs detected, we directly derive, for the first time from a single observational data set, the NEO size distribution from 1 km down to 10 m. We find that there are NEOs larger than 10 m. This result implies a factor of 10 fewer small NEOs than some previous results, though our derived size distribution is in good agreement with several other estimates.