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A low-density M-type asteroid in the main belt.
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. margot@gps.caltech.edu
Science (New York, N.Y.)
|June 21, 2003
Summary
The bulk density of asteroid 22 Kalliope is low, suggesting it is not metallic. Its satellite may be impact ejecta, indicating different internal structures.
Area of Science:
- Planetary Science
- Asteroid Research
- Astrogeology
Background:
- M-type asteroids are theorized to be metallic cores of differentiated bodies.
- Understanding asteroid composition is key to solar system formation models.
Purpose of the Study:
- To determine the bulk density and composition of the main-belt asteroid 22 Kalliope.
- To investigate the origin and relationship of its satellite.
Main Methods:
- Analysis of orbital parameters of a satellite around 22 Kalliope.
- Calculation of bulk density based on orbital data.
Main Results:
- The bulk density of 22 Kalliope was calculated as 2.37 +/- 0.4 g/cm³.
- This low density suggests a non-metallic composition, possibly chondritic with 30% porosity.
- The circular orbit of the satellite implies differing internal structures and tidal dissipation rates between Kalliope and its satellite.
Conclusions:
- 22 Kalliope is unlikely to be a metallic core due to its low density.
- The asteroid may be composed of chondritic material with significant porosity.
- The satellite might be a result of impact ejecta, with distinct internal properties from Kalliope.
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