= Shigeru Ida
{c}
<Shigeru Ida> studies the assembly of <planets> from smaller orbiting bodies. With <Eiichiro Kokubo>, he investigated <oligarchic growth>, in which a relatively small population of large <protoplanets> grows by accreting surrounding <planetesimals>.
The large bodies also stir the random <motion> of the smaller ones. That dynamical heating changes their capture efficiency, so growth cannot be inferred from <mass> alone. Their numerical calculations connected growth and orbital spacing, helping explain how a disk of many small bodies can develop a more orderly population of planetary embryos.<Oligarchic Growth of Protoplanets by Eiichiro Kokubo and Shigeru Ida>[Abstract: planetesimal velocity evolution, separated large bodies and oligarchic growth]{ref}
\Image[https://www.titech.ac.jp/english/public-relations/img/110-elsi-ida-lab-04.jpg]
{title=Portrait of <Shigeru Ida>}
{description=External portrait hosted by Tokyo Institute of Technology / Institute of Science Tokyo.}
{source=https://www.titech.ac.jp/english/public-relations/prospective-students/first-step/elsi-ida-lab}
{width=250}
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