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arXiv 1708.09504astro-ph.EP
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NEOWISE再激活任务第三年:小行星直径和反照率

NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos

Joseph R. Masiero, C. Nugent, A. K. Mainzer, E. L. Wright, J. M. Bauer, R. M. Cutri, T. Grav, E. Kramer, S. Sonnett

摘要:

近地天体宽视场红外巡天探测器(NEOWISE)重新启动飞行任务已经完成了第三年的近地小行星和彗星热红外巡天工作。NEOWISE收集通过其视场的3.4微米和4.6微米的太阳系物体的同时观测结果。利用这些数据可以确定内太阳系天体的总热辐射,从而确定这些天体的大小。在本文中,我们介绍了在巡天第三年期间探测到的170个近地天体和6,110个百万大行星的小行星直径的热模型拟合,以及相关的光学几何学拟合。我们将我们的结果与NEOWISE先前的热模型结果进行比较,以获得重叠样本集,以及通过其他独立方法确定的直径,并发现我们对近地天体的直径测量结果与先前测量值的26%(1-sigma)一致。MBA的直径在17%(1-sigma)以内。这使得NEOWISE调查中发现的独特近地天体总数达到541个,超过了2010年完全低温任务期间观察到的数量。

英文摘要:

The Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) reactivation mission has completed its third year of surveying the sky in the thermal infrared for near-Earth asteroids and comets. NEOWISE collects simultaneous observations at 3.4 um and 4.6 um of solar system objects passing through its field of regard. These data allow for the determination of total thermal emission from bodies in the inner solar system, and thus the sizes of these objects. In this paper we present thermal model fits of asteroid diameters for 170 NEOs and 6110 MBAs detected during the third year of the survey, as well as the associated optical geometric albedos. We compare our results with previous thermal model results from NEOWISE for overlapping sample sets, as well as diameters determined through other independent methods, and find that our diameter measurements for NEOs agree to within 26% (1-sigma) of previously measured values. Diameters for the MBAs are within 17% (1-sigma). This brings the total number of unique near-Earth objects characterized by the NEOWISE survey to 541, surpassing the number observed during the fully cryogenic mission in 2010.

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