The Open UniversitySkip to content
 

Constraints on the near-Earth asteroid obliquity distribution from the Yarkovsky effect

Tardioli, C.; Farnocchia, D.; Rozitis, B.; Cotto-Figueroa, D.; Chesley, S. R.; Statler, T. S. and Vasile, M. (2017). Constraints on the near-Earth asteroid obliquity distribution from the Yarkovsky effect. Astronomy & Astrophysics, 608, article no. A61.

Full text available as:
[img]
Preview
PDF (Version of Record) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (803kB) | Preview
DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201731338
Google Scholar: Look up in Google Scholar

Abstract

Aims. From lightcurve and radar data we know the spin axis of only 43 near-Earth asteroids. In this paper we attempt to constrain the spin axis obliquity distribution of near-Earth asteroids by leveraging the Yarkovsky effect and its dependence on an asteroid’s obliquity.
Methods. By modeling the physical parameters driving the Yarkovsky effect, we solve an inverse problem where we test different simple parametric obliquity distributions. Each distribution results in a predicted Yarkovsky effect distribution that we compare with a X2 test to a dataset of 125 Yarkovsky estimates.
Results. We find different obliquity distributions that are statistically satisfactory. In particular, among the considered models, the best-fit solution is a quadratic function, which only depends on two parameters, favors extreme obliquities, consistent with the expected outcomes from the YORP effect, has a 2:1 ratio between retrograde and direct rotators, which is in agreement with theoretical predictions, and is statistically consistent with the distribution of known spin axes of near-Earth asteroids.

Item Type: Journal Item
Copyright Holders: 2017 ESO
ISSN: 1432-0746
Project Funding Details:
Funded Project NameProject IDFunding Body
Probing solar system process using extreme asteroidsNot SetRoyal Astronomical Society (RAS)
Keywords: methods: statistical; celestial mechanics; minor planets; asteroids: general
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 54141
Depositing User: Benjamin Rozitis
Date Deposited: 06 Apr 2018 15:25
Last Modified: 21 Oct 2019 00:00
URI: http://oro.open.ac.uk/id/eprint/54141
Share this page:

Metrics

Altmetrics from Altmetric

Citations from Dimensions

Download history for this item

These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU