Collisional and dynamical history of Ida

Richard Greenberg, William F. Bottke, Michael Nolan, Paul Geissler, Jean Marc Petit, Daniel D. Durda, Erik Asphaug, James Head

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


The history of Ida is constrained by its membership in the Koronis family, its satellite Dactyl, the record of impacts left on its surface, and other dynamical, morphological, and spectral properties. Models of crater production and comparably effective erasure processes, combined with the current size - frequency distribution of craters, suggest that the age of the surface is either about 50 myr or > 1 byr. The younger age may be inconsistent with the degraded appearance of many craters, while the older age conflicts with the collisional life expectancy of Dactyl. Consideration of Dactyl's evolution may resolve this issue as well as shed light on the formation of Dactyl, the density of Ida, and possible source regions for Ida and Dactyl within the Koronis parent body.

Original languageEnglish (US)
Pages (from-to)106-118
Number of pages13
Issue number1
StatePublished - Mar 1996
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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