Radiation-induced torques on spheroids

Details Radiation-induced torques on spheroids Radiation-induced torques on spheroids

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...471..345b&link_type=abstract

Astronomy and Astrophysics, Volume 471, Issue 1, August III 2007, pp.345-353

Astronomy and Astrophysics

Astrophysics

9

Methods: Analytical, Celestial Mechanics, Minor Planets, Asteroids

Scientific paper

Radiation-induced torques on ellipsoids of revolution are discussed.
Exact formulae for the thermal YORP torques are given in terms of elliptic integrals.
It is demonstrated that in the absence of thermal inertia, the average values of
dynamically significant projections of these torques are zero if a spheroid rotates
around the axis of maximum inertia and if there are no resonances between rotation
and orbital motion. The thermal lag leads to a systematic drift in the obliquity, but
it does not affect the rotation period. The direct radiation pressure torques on spheroids are shown to be zero.

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