#yarkovsky — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #yarkovsky, aggregated by home.social.
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Computing the orbital dynamics of a #NEA is a difficult problem. The leading source of orbital uncertainty for #Apophis is the #Yarkovsky effect https://www.nature.com/articles/s43247-021-00337-x
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The Yarkovsky effect affects the orbit of small rotating bodies.
An object's day side heats up due to the sun and gradually radiates away the heat as it rotates. The surface is hottest and the radiation highest not at noon but around 2-3 p.m. This creates a net force in the 8-9 a.m. direction as shown below.
With prograde rotation, the force speeds up the body and expands its orbit. For retrograde rotation (like that of Bennu), the orbit shrinks.https://skyandtelescope.org/astronomy-news/apophis-pays-a-visit-this-week/
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#Bennu #Yarkovsky