  We propose an analytic model for the normal YORP and diurnal Yarkovsky
effects experienced by a convex asteroid. Both the YORP torque and the
Yarkovsky force are expressed as integrals of a universal function over the
surface of an asteroid. Although in general this function can only be
calculated numerically from the solution of the heat conductivity equation,
approximate solutions can be obtained in quadratures for important limiting
cases. We consider 3 such simplified models: Rubincam's approximation (zero
heat conductivity), low thermal inertia limit (including the next order
correction and thus valid for small heat conductivity), and high thermal
inertia limit (valid for large heat conductivity). All three simplified models
are compared with the exact solution.
