He once proposed that Pluto should be cross-listed as both a planet and a minor planet and assigned the asteroid number 10000; however, this proposal was not accepted.
He has studied the transport of meteorites between planets, the delivery of meteoroids from the main asteroid belt, and the possibility of the transport of life via this mechanism, known as panspermia.
The density measured by NEAR Shoemaker, 1,300 kg/m3, is less than half that of a typical carbonaceous chondrite; this may indicate that the asteroid is very loosely packed rubble pile.
He participated in the Palomar Planet Crossing Asteroid Survey (PCAS) as an observer and astrometrist under the direction of American astronomer Eleanor Helin (JPL/Caltech) from 1985 to 1988.
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