A compositional study of asteroid 243 Ida and Dactyl from Galileo NIMS and SSI observations

Details A compositional study of asteroid 243 Ida and Dactyl from Galileo NIMS and SSI observations A compositional study of asteroid 243 Ida and Dactyl from Galileo NIMS and SSI observations

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5090g&link_type=abstract

Journal of Geophysical Research (Planets), Volume 107, Issue E10, pp. 20-1, CiteID 5090, DOI 10.1029/2001JE001759

Physics

2

Planetary Sciences: Composition, Planetary Sciences: Remote Sensing, Planetary Sciences: Surface Materials And Properties

Scientific paper

On 28 August 1993 the Galileo spacecraft encountered the asteroid 243 Ida and its moon Dactyl. A variety of observations of this asteroid system were collected, including visible wavelength (0.4-1.0 μm) imagery with the Solid State Imager (SSI) instrument and infrared wavelength (0.7-5.2 μm) with the Near Infrared Mapping Spectrometer (NIMS) for both objects. These data indicate that 243 Ida has an orthopyroxene/(orthopyroxene + olivine) ratio of 0.35, a value consistent with that of LL chondrites. The ratio does not vary significantly for the portions of 243 Ida observed by the Galileo NIMS instrument. Asteroid 243 Ida is a SIV subtype of the S type asteroid population. Two very similar spectral units were identified in a combined SSI and NIMS spectral data set. The primary discriminator between the spectral units is a small difference in the amount of ``red'' slope. A larger ``red'' slope value corresponds to regions of 243 Ida where ejecta from the crater Azurra are present. Dactyl has a relatively deep absorption centered around 0.97 μm. This suggests that Dactyl has larger mineral grains on its surface in comparison to 243 Ida and thus was formed by a younger collision than that which formed 243 Ida.

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