54509 YORP

This minor planet is named after four astronomers: Ivan Osipovich Yarkovsky, John O'Keefe, Vladimir Radzievskii, and Stephen Paddack. These astronomers each contributed to the understanding of the Yarkovsky-O'Keefe-Radzievskii-Paddack effect, or YORP effect, wherein parallel rays from the Sun produce a dynamically-significant torque on a small asteroid with a non-uniform geography or albedo over time. This minor planet in particular, along with 1862 Apollo, were useful in observing the kinematics of the YORP effect.

Also, "yorp" is a magnificently funny word.

The symbol of this minor planet is a diagram of the YORP effect: a small circle with a dot, representing the Sun, with a single short ray going down from the bottom of it to touch a tiny circle with a star inside it, representing an asteroid. This symbol also has the same general shape as an astronomer's symbol, which is reflective of the fact that it is indirectly named after four astronomers.

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