High resolution surface brightness profiles of near-earth asteroids
High resolution surface brightness profiles of near-earth asteroids
复制标题
近地小行星的高分辨率表面亮度剖面
DOI：
10.1016/0019-1035(92)90134-s
复制
发表时间：
1992
期刊：
影响因子：
3.2
通讯作者：
D. Jewitt
中科院分区：
文献类型：
--
作者：
J. Luu;D. Jewitt
提出了一种利用高分辨率表面光度学搜索和估算近地小行星质量损失的新方法。该方法应用于在夏威夷大学2.2米望远镜上用电荷耦合器件观测的11个近地小行星。该方法得出的极限质量损失率M ≤ 0.1 kg sec−1，比弱活动彗星的典型速率小1-2个数量级。然而，这些质量损失率上限意味着近地小行星的部分活动区与彗星的部分活动区相当。由于近地小行星体积小，这些部分活动区产生的质量损失率低于现有技术的探测极限;因此，近地小行星中可能存在未被注意到的低水平彗星活动。
We present a new method to search for and estimate mass loss in near-Earth asteroids (NEAs) using high resolution surface photometry. The method was applied to 11 NEAs observed with a charged-coupled device (CCD) at the University of Hawaii 2.2-m telescope. The method yields limiting mass loss rates M ≤ 0.1 kg sec−1, 1–2 orders of magnitude smaller than the typical rates of weakly active comets. However, these mass loss rate upper limits imply fractional active areas in NEAs that are comparable to cometary fractional active areas. Because of the small sizes of the NEAs, the mass loss rates produced by these fractional active areas are below the detection limit of current techniques; thus there may exist low-level cometary activity amongst the NEAs which goes unnoticed.