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Physical model of near-Earth asteroid (1917) Cuyo from ground-based optical and thermal-IR observations

Rożek, A., Lowry, S.C., Rozitis, B., Green, S.F., Snodgrass, C., Weissman, P.R., Fitzsimmons, A., Hicks, M.D., Lawrence, K.J., Duddy, S.R., and others. (2019) Physical model of near-Earth asteroid (1917) Cuyo from ground-based optical and thermal-IR observations. Astronomy & Astrophysics, . Article Number UNSPECIFIED. ISSN 0004-6361. (doi:10.1051/0004-6361/201834162) (KAR id:74005)

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https://doi.org/10.1051/0004-6361/201834162

Abstract

Context. The near-Earth asteroid (1917) Cuyo was subject to radar and lightcurve observations during a close approach in 1989, and observed up until 2008. It was selected as one of our ESO

Γ = 44 ± 9 J m−2 s −1/2 K −1, and a roughness fraction of 0.52 ± 0.26. This enabled a YORP strength prediction of ν = (−6.39±0.96)×10−10 rad day−2. We also see evidence of surface compositional variation.

Conclusions. The low value of YORP predicted by means of thermophysical analysis, consistent with the results of the lightcurve study, might be due to the self-limiting properties of rotational YORP, possibly involving movement of sub-surface and surface material. This may also be consistent with the surface compositional variation that we see. The physical model of Cuyo can be used to investigate cohesive forces as a way to explain why some targets survive rotation rates faster than the fission limit.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361/201834162
Uncontrolled keywords: minor planets, asteroids: individual: (1917) Cuyo – methods: observational – methods: data analysis – techniques: photometric – techniques: spectroscopic – radiation mechanisms: thermal
Subjects: Q Science > QB Astronomy
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Stephen Lowry
Date Deposited: 21 May 2019 10:08 UTC
Last Modified: 07 Aug 2020 11:37 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/74005 (The current URI for this page, for reference purposes)
Rożek, A.: https://orcid.org/0000-0003-2341-2238
Lowry, S.C.: https://orcid.org/0000-0002-5605-4329
Green, S.F.: https://orcid.org/0000-0002-9153-9786
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