CaltechAUTHORS
Published September 9, 1994 | Version public
Journal Article Metadata-only

First Images of Asteroid 243 Ida

Creators

  • 1. ROR icon NOIRLab
  • 2. ROR icon Planetary Science Institute
  • 3. ROR icon Cornell University
  • 4. ROR icon Jet Propulsion Lab
  • 5. ROR icon Arizona State University
  • 6. ROR icon University of Arizona
  • 7. ROR icon Brown University
  • 8. ROR icon United States Geological Survey
  • 9. ROR icon Ames Research Center
  • 10. ROR icon RAND Corporation
  • 11. ROR icon German Aerospace Center
  • 12. ROR icon University of Hawaii at Manoa
  • 13. ROR icon California Institute of Technology
  • 14. ROR icon National Aeronautics and Space Administration

Abstract

The first images of the asteroid 243 Ida from Galileo show an irregular object measuring 56-kilometers by 24 kilometers by 21 kilometers. Its surface is rich in geologic features, including systems of grooves, blocks, chutes, albedo features, crater chains, and a full range of crater morphologies. The largest blocks may be distributed nonuniformly across the surface; lineaments and dark-floored craters also have preferential locations. Ida is interpreted to have a substantial regolith. The high crater density and size-frequency distribution (–3 differential power-law index) indicate a surface in equilibrium with saturated cratering. A minimum model crater age for Ida—and therefore for the Koronis family to which Ida belongs—is estimated at 1 billion years, older than expected.

Additional Information

© 1994 American Association for the Advancement of Science. We thank the Galileo project and the National Aeronautics and Space Administration (NASA) for support; in particular, the Galileo Flight Team, led by W. O'Neil, N. Ausman, M. Landano, and O. Adams. The Ida mosaic was constructed by L. Wainio's group and we wish to recognize H. Mortensen. We also acknowledge D. J. Tholen, R. P. Binzel, P. Magnusson, A. Barucci, S. Mottola, R. Sullivan, R. Pappalardo, P. Geissler, J. -M. Petit, J. Moore, W. F. Bottke, M. Nolan, E. Ryan, W. Merline, B. E. A. Mueller, E. Ashphaug, B. Carcich, P. Lee, D. Simonelli, R. Wagner, P. J. Guske, J. Yoshimizu, and R. Hasegawa. A portion of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. The National Optical Astronomy Observatories are operated by the Association of Universities for Research in Astronomy, Inc. (AURA), under cooperative agreement with the National Science Foundation.

Additional details

Identifiers

Eprint ID
37306
Resolver ID
CaltechAUTHORS:20130305-114445519

Funding

NASA

Dates

Created
2013-03-06
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Updated
2021-11-09
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Caltech Custom Metadata

Caltech groups
Division of Geological and Planetary Sciences (GPS)