Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-16
Monthly Notices of the Royal Astronomical Society, 2008, vol. 388, pp. 927 - 944
Astronomy and Astrophysics
Astrophysics
19 pages, 3 figures, published Mon. Not. R.A.S with minor errors that are corrected in the present version
Scientific paper
10.1111/j.1365-2966.2008.13471.x
The second order analytical approximation of the mean YORP torque components is given as an explicit function of the shape spherical harmonics coefficients for a sufficiently regular minor body. The results are based upon a new expression for the insolation function, significantly simpler than in previous works. Linearized plane parallel model of the temperature distribution derived from the insolation function allows to take into account a nonzero conductivity. Final expressions for the three average components of the YORP torque related with rotation period, obliquity, and precession are given in a form of Legendre series of the cosine of obliquity. The series have good numerical properties and can be easily truncated according to the degree of Legendre polynomials or associated functions, with first two terms playing the principal role. The present version fixes the errors discovered in the text that appeared in Monthly Notices RAS (388, pp. 297-944).
Breiter Slawomir
Michalska H.
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