surfacethermophysicalpropertiesonthepotentiallyhazardousasteroid99942apophis

	surfacethermophysicalpropertiesonthepotentiallyhazardousasteroid99942apophis
	Yu Liangliang1 ; Ji Jianghui 2; Ip Winghuen 1
刊名	researchinastronomyandastrophysics
	2017
卷号	17 期号:7 页码:10
ISSN号	1674-4527
英文摘要	We investigate the surface thermophysical properties (thermal emissivity, thermal inertia, roughness fraction and geometric albedo) of asteroid (99942) apophis, using the currently available mid-infrared observations from canaricain on gran telescopio canarias and far-infrared data from pacs on herschel, based on the advanced thennophysical model. we show that the thermal emissivity of apophis should be wavelength dependent from 8.70 mu m to 160 mu m, and the maximum emissivity may appear around 20 mu m, similar to that of vesta. moreover, we further derive the thermal inertia, roughness fraction, geometric albedo and effective diameter of apophis within a possible 1 sigma scale of gamma = 100(-52)(+100) jm(-2) s-0.5 k-1, integral(r) = 0.78 similar to 1.0, p(v) = 0.286(-0.026)(+0.030) and d-eff = 378(-25)(+19)m, and 3 sigma scale of gamma = 100(-100)(+240) jm(-2) s(-0.5) k-1, f(r) = 0.2 similar to 1.0, p(v) = 0.286(-0.029)(+0.039) and d-eff = 378(-29)(+27) m. the derived low thermal inertia but high roughness fraction may imply that apophis could have regolith on its surface, where stronger space weathering but weaker regolith migration has happened in comparison with asteroid itokawa. our results show that small-size asteroids could also have fine regolith on the surface, and further infer that apophis may have been delivered from the main belt by the yarkovsky effect.
语种	英语
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/31745]
专题	中国科学院紫金山天文台
作者单位	1.澳门科技大学 2.中国科学院紫金山天文台
推荐引用方式 GB/T 7714	Yu Liangliang,Ji Jianghui,Ip Winghuen. surfacethermophysicalpropertiesonthepotentiallyhazardousasteroid99942apophis[J]. researchinastronomyandastrophysics,2017,17(7):10.
APA	Yu Liangliang,Ji Jianghui,&Ip Winghuen.(2017).surfacethermophysicalpropertiesonthepotentiallyhazardousasteroid99942apophis.researchinastronomyandastrophysics,17(7),10.
MLA	Yu Liangliang,et al."surfacethermophysicalpropertiesonthepotentiallyhazardousasteroid99942apophis".researchinastronomyandastrophysics 17.7(2017):10.