EDP Sciences
Free access
Issue
A&A
Volume 381, Number 3, January III 2002
Page(s) 1059 - 1065
Section The solar system
DOI http://dx.doi.org/10.1051/0004-6361:20011587


A&A 381, 1059-1065 (2002)
DOI: 10.1051/0004-6361:20011587

Hyperion-Iapetus: Collisional relationships

S. Marchi1, C. Barbieri2, A. Dell'Oro3 and P. Paolicchi4

1  Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
2  Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
    e-mail: barbieri@pd.astro.it
3  Dipartimento di Fisica, Università di Pisa, piazza Torricelli 2, 56127 Pisa, Italy
    e-mail: aldo@astr15pi.difi.unipi.it
4  Dipartimento di Fisica, Università di Pisa, piazza Torricelli 2, 56127 Pisa, Italy
    e-mail: paolicchi@df.unipi.it

(Received 29 June 2001 / Accepted 25 October 2001)

Abstract
In this paper, we will deal with one of the most fascinating problems of the Solar System: the origin of the double face of Iapetus, where one half of the satellite is significantly brighter than the other. The "transfer of mass" process (see Marchi et al. 2001) may be a viable explanation for the visible dichotomy. In this process a satellite undergoes mass transfer from other satellites belonging to the same system. We analyze the pair Hyperion-Iapetus and suggest a possible explanation for the formation of the dark region, which is also known as Cassini Regio.


Key words: minor planets, asteroids -- solar system: general

Offprint request: S. Marchi, marchi@pd.astro.it




© ESO 2002