论文标题
靠近地球物体的DeciAs反照率分布
Debiased albedo distribution for Near Earth Objects
论文作者
论文摘要
我们扩展了地球对象（NEO）模型（Granvik等，2018）的最新轨道和绝对幅度，以提供NEO几何反照率的统计描述。一旦应用了新的观测偏见模型，我们的模型就可以根据NEO人群的Neowise反照率数据进行校准，并可以很好地再现这些数据。结果与先前的估计一致。大约有1,000个NEO，直径为d> 1 km，平均反照率将绝对幅度转换为直径为0.147。我们没有发现任何具有统计学意义的证据，表明NEOS的反照率分布取决于NEO规模。取而代之的是，我们发现证据表明，在Granvik等人中发现的小围栏距离处NEO的破坏。 （2016年）对于黑暗NEOS优先发生。撞击地球的公里大小的尸体之间的间隔应平均每750，000年发生一次。低和高的反照率NEO在轨道空间中充分混合，但是趋势仍然存在，较高的反照率物体位于较小的半轴轴和较低的反照率物体处，更可能在较大的半轴轴处发现。
We extend the most recent orbital and absolute magnitude Near Earth Object (NEO) model (Granvik et al., 2018) to provide a statistical description of NEO geometric albedos. Our model is calibrated on NEOWISE albedo data for the NEO population and reproduces these data very well once a simple model for the NEOWISE observational biases is applied. The results are consistent with previous estimates. There are about 1,000 NEOs with diameter D>1km and the mean albedo to convert absolute magnitude into diameter is 0.147. We do not find any statistically significant evidence that the albedo distribution of NEOs depends on NEO size. Instead, we find evidence that the disruption of NEOs at small perihelion distances found in Granvik et al. (2016) occurs preferentially for dark NEOs. The interval between km-sized bodies striking the Earth should occur on average once every 750,000 years. Low and high albedo NEOs are well mixed in orbital space, but a trend remains with higher albedo objects being at smaller semimajor axes and lower albedo objects more likely found at larger semimajor axes.
