PMO OpenIR
surfacethermophysicalpropertiesonthepotentiallyhazardousasteroid99942apophis
Yu Liangliang1; Ji Jianghui2; Ip Winghuen1
2017
Source Publicationresearchinastronomyandastrophysics
ISSN1674-4527
Volume17Issue:7Pages:10
AbstractWe 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.
Language英语
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/31746
Collection中国科学院紫金山天文台
Affiliation1.澳门科技大学
2.中国科学院紫金山天文台
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Yu Liangliang]'s Articles
[Ji Jianghui]'s Articles
[Ip Winghuen]'s Articles
Baidu academic
Similar articles in Baidu academic
[Yu Liangliang]'s Articles
[Ji Jianghui]'s Articles
[Ip Winghuen]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Yu Liangliang]'s Articles
[Ji Jianghui]'s Articles
[Ip Winghuen]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.