Is there a 'simple' YORP calculation

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The YORP effect calculation is complex, influenced by an object's shape, size, and solar distance. A simplified version for estimating YORP is found in Rubincam's approximation, which provides a formula: dw/dt ~ +/- 18/(a^2*D^2). In this formula, 'a' represents the semi-major axis in astronomical units (AU), and 'D' is the diameter in kilometers. The result indicates the change in cycles per day per million years. This approximation allows for a rough estimation of the YORP effect on average asteroids.
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I known the calculation of the YORP effect on an object is quite complex (I have a lot of papers on the subject and all the math is a little beyond me) and is based on the objects shape, distance from the sun and size, but is there a 'simple' version that will allow one to calculate a 'ballpark' based on an 'average' asteroid shape, distance from the sun and diameter of the object?

Cheers

David
 
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Never mind, I found 'Rubincam's approximation' by Dr Alan Harris:

dw/dt ~ +/- 18/(a^2*D^2)

where a = semi major axis in AU and D = diameter in km and the result is the difference in cycles per day per million years.

Cheers

David
 

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