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Science 9 September 1994:
Vol. 265. no. 5178, pp. 1543 - 1547
DOI: 10.1126/science.265.5178.1543
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Articles
First Images of Asteroid 243 Ida
M. J. S. Belton 1,
C. R. Chapman 2,
J. Veverka 3,
K. P. Klaasen 4,
A. Harch 4,
R. Greeley 5,
R. Greenberg 6,
J. W. Head III 7,
A. McEwen 8,
D. Morrison 9,
P. C. Thomas 3,
M. E. Davies 10,
M. H. Carr 11,
G. Neukum 12,
F. P. Fanale 13,
D. R. Davis 2,
C. Anger 14,
P. J. Gierasch 3,
A. P. Ingersoll 15, and
C. B. Pilcher 16
1 National Optical Astronomy Observatories, Tucson, AZ 85719, USA.
2 Planetary Science Institute—Science Applications International Corporation (SAIC), Tucson, AZ 85705, USA.
3 Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
4 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
5 Department of Geology, Arizona State University, Tempe, AZ 85287-1404, USA.
6 Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 87721, USA.
7 Department of Geology, Brown University, Providence, RI 02912, USA.
8 United States Geological Survey, Flagstaff, AZ 86001, USA.
9 National Aeronautics and Space Administration Ames Research Center, Moffet Field, CA 94035, USA.
10 RAND, Santa Monica, CA 90406, USA.
11 United States Geological Survey, Menlo Park, CA 94025, USA.
12 Deutsche Forschungsanstalt für Luft und Raumfahrt, Institute for Planetary Exploration, Berlin, Germany
13 Institute of Geophysics, University of Hawaii, Honolulu, HI 96822, USA.
14 Institute for Space and Terrestrial Science, Concord, Ontario, Canada L4K 3C8
15 California Institute of Technology, Pasadena, CA 91125, USA.
16 National Aeronautics and Space Administration, Washington, DC 20546, USA.
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.
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