### Abstract

Original language | English |
---|---|

Article number | A61 |

Journal | Astronomy and Astrophysics |

Volume | 608 |

DOIs | |

Publication status | Published - 1 Dec 2017 |

### Fingerprint

### Keywords

- celestial mechanics
- minor planets
- asteroids

### Cite this

*Astronomy and Astrophysics*,

*608*, [A61]. https://doi.org/10.1051/0004-6361/201731338

}

*Astronomy and Astrophysics*, vol. 608, A61. https://doi.org/10.1051/0004-6361/201731338

**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.; Vasile, M.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Constraints on the near-Earth asteroid obliquity distribution from the Yarkovsky effect

AU - Tardioli, C.

AU - Farnocchia, D.

AU - Rozitis, B.

AU - Cotto-Figueroa, D.

AU - Chesley, S. R.

AU - Statler, T. S.

AU - Vasile, M.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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 chi^2 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.

AB - 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 chi^2 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.

KW - celestial mechanics

KW - minor planets

KW - asteroids

U2 - 10.1051/0004-6361/201731338

DO - 10.1051/0004-6361/201731338

M3 - Article

VL - 608

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A61

ER -