| タイトル | Asteroid collisional history - Effects on sizes and spins |
| 著者（英） | Weidenschilling, Stuart J.; Paolicchi, Paolo; Farinella, Paolo; Davis, Donald R.; Binzel, Richard P. |
| 著者所属（英） | Massachusetts Inst. of Tech.|Pisa Univ.|Planetary Science Inst. |
| 発行日 | 1989-01-01 |
| 言語 | eng |
| 内容記述 | The effects of asteroid collisional history on sizes and spins of present-day objects are discussed. Collisional evolution studies indicate that collisions have altered the spin-rates of small bodies, but that the largest asteroids may have retained their primordial rotation rates. Most asteroids larger than 100 km diam have probably been shattered, but have gravitationally recaptured their fragments to form a rubble-pile structure. Large angular momentum asteroids appear to have Maclaurian spheroidal or Jacobi-ellipsoid-like shapes; some of them may have fissioned into binaries. An integrated size and spin collisional evolution model is presented, with two critical parameters: one which determines the spin rates for small fragments resulting from a shattering collision, and the other determines the fraction of impact angular momentum that is retained by the target. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 90A27037 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/357620 |
|
