| Texto completo | |
| Autor(es): |
Winter, Othon C.
[1]
;
Souza, Alexandre P. S.
[1]
;
Sfair, Rafael
[1]
;
Giuliatti Winter, Silvia M.
[1]
;
Mourao, Daniela C.
[1]
;
Foryta, Dietmar W.
[2]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Sao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP - Brazil
[2] Univ Fed Parana UFPr, Curitiba, Parana - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ASTROPHYSICAL JOURNAL; v. 852, n. 1 JAN 1 2018. |
| Citações Web of Science: | 0 |
| Resumo | |
The Cassini spacecraft found a new and unique ring that shares the trajectory of Janus and Epimetheus, co-orbital satellites of Saturn. Performing image analysis, we found this to be a continuous ring. Its width is between 30% and 50% larger than previously announced. We also verified that the ring behaves like a firefly. It can only be seen from time to time, when Cassini, the ring, and the Sun are arranged in a particular geometric configuration, in very high phase angles. Otherwise, it remains ``in the dark,{''} invisible to Cassini's cameras. Through numerical simulations, we found a very short lifetime for the ring particles, less than a couple of decades. Consequently, the ring needs to be constantly replenished. Using a model of particle production due to micrometeorites impacts on the surfaces of Janus and Epimetheus, we reproduce the ring, explaining its existence and the ``firefly{''} behavior. (AU) | |
| Processo FAPESP: | 11/08171-3 - Dinâmica orbital de pequenos corpos |
| Beneficiário: | Othon Cabo Winter |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 16/24561-0 - A relevância dos pequenos corpos em dinâmica orbital |
| Beneficiário: | Othon Cabo Winter |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |