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・ Harold Goodwin
・ Harold Goodwin (American actor)
・ Harold Goodwin (American football)
・ Harold Goodwin (cricketer)
・ Harold Goodwin (English actor)
・ Harold Gordon
・ Harold Gore
・ Harold Gore Browne
・ Harold Gosnell
・ Harold Gough
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・ Harold Gould (baseball)
・ Harold Gould Henderson
・ Harold Gourley
・ Harold F. Kress
Harold F. Levison
・ Harold F. Linder
・ Harold F. Loomis
・ Harold F. Williamson
・ Harold F. Youngblood
・ Harold Fairburn
・ Harold Falkner
・ Harold Falls
・ Harold Faltermeyer
・ Harold Fanjoy
・ Harold Faragher
・ Harold Farberman
・ Harold Farncomb
・ Harold Fear
・ Harold Feehan


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Harold F. Levison : ウィキペディア英語版
Harold F. Levison

Harold F. "Hal" Levison is a planetary scientist specializing in planetary dynamics. He argued for a distinction between what are now called dwarf planets and the other eight planets based on their inability to "clear the neighborhood around their orbits", although his proposal suggested the terms "unterplanet" and "überplanet" and used the word "dwarf" to mean something else. Among other distinctions, he is the co-author of SWIFT, a commonly used symplectic integrator that solves planetary equations of motion for periods of billions of years. He currently works at the Southwest Research Institute, Boulder, CO, and studies planetary orbits and their evolution through solar system history.
Levison is the Principal Investigator of the proposed Lucy (spacecraft) Trojan asteroid mission which was selected as one of five semifinalists for the 2015 NASA Discovery Program mission competition.
== References ==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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