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An age-colour relationship for main-belt S-complex asteroids
Robert Jedicke1, David Nesvorný, Robert Whiteley
1Institute for Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA. jedicke@ifa.hawaii.edu
Nature
|May 21, 2004
Summary
Space weathering alters asteroid surfaces, explaining why meteorite spectra differ from their parent bodies. This study quanties space weathering rates on S-complex asteroids, linking them to ordinary chondrites.
Area of Science:
- Planetary Science
- Astronomy
- Geology
Background:
- Asteroid collisions eject fragments that become meteorites.
- Spectra of ordinary chondrites (OC) meteorites do not match S-complex asteroids.
- Space weathering is a proposed explanation for spectral differences.
Purpose of the Study:
- Quantify the rate of space weathering on S-complex asteroids.
- Investigate the genetic relationship between S-complex asteroids and OC meteorites.
Main Methods:
- Analyzed the relationship between asteroid family ages and their colors.
- Extrapolated age-color data to young ages.
Main Results:
- Measured the rate of space weathering on S-complex asteroids.
- The extrapolated age-color relationship matched the color of fresh OC meteorite samples.
Conclusions:
- Strong evidence supports a genetic link between S-complex asteroids and OC meteorites.
- Space weathering is a key process in modifying asteroid surfaces and explaining meteorite origins.
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