[FourtySeven]

The Yarkovsky effect is a force acting on a rotating body in space caused by the anisotropic emission of thermal photons, which carry momentum. It is usually considered in relation to meteoroids or small asteroids (about 10 cm to 10 km in diameter), as its influence is most significant for these bodies.

Yes of course! Who doesn't know THAT, pfft...(makes a "sure I knew that" face)

[Red Badger]

To put it in layman’s terms, The smaller the body the larger the effect of photons hitting it. But the sun’s output is not constant so it will take many years of measurements to average it out to determine the orbit accurately..............