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On the Origin of Retrograde Orbit Satellites around Saturn and Jupiter

Published online by Cambridge University Press:  06 April 2010

Yuehua Ma ,
Jiaqing Zheng  and
Xiaohai Shen
Yuehua Ma
Affiliation:
Purple Mountain Observatory, Nanjing 210008, China, email: [email protected] Turku University, Tuorla Observatory, 21500 Piikkiö, Finland email: [email protected]
Jiaqing Zheng
Affiliation:
Purple Mountain Observatory, Nanjing 210008, China, email: [email protected] Turku University, Tuorla Observatory, 21500 Piikkiö, Finland email: [email protected]
Xiaohai Shen
Affiliation:
Jiaozuo Teachers College, Henan, 454000, China
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Abstract

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Many Retrograde Orbit Satellites around Jupiter and Saturn have been found recently. Most of them are small with irregular shapes. They are farther from the planet than regular satellites. Their orbits have big eccetricities.

We tested their dynamical origin and found:

  1. 1. The small bodies can be captured by normal satellites and form retrograde orbits. But these orbits are not stable. Sooner or later, they would escape from planetary region or fall down into the planets.

  2. 2. Another way is that they have formed by collisions just after regular moons formed. We studied the mechanism and obtained good results.

Keywords

Solar Systemplanets and satellites: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S263: Icy Bodies of the Solar System , August 2009 , pp. 157 - 160
Copyright
Copyright © International Astronomical Union 2010

References

Zheng, J. Q. 1994, ApJ Suppl., 108, 1994Google Scholar