satellites;
general;
satellites of Saturn;
orbits;
D O I:
10.1016/j.icarus.2004.08.018
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We have obtained numerically integrated orbits for Saturn's coorbital satellites, Janils and Epimetheus. together with Saturn's F-ring shepherding satellites, Prometheus and Pandora. The orbits are fit to astrometric observations acquired with the Hubble Space Telescope and from Earth-based observatories and to imaging data acquired from the Voyager spacecraft. The observations cover the 38 year period from the 1966 Saturn ring plane crossing to the spring of 2004. in the process of determining the orbits we have found masses for all four satellites. The ensities derived from the masses for Janus, Epimetheus, Prometheus. and Pandora in units of g cm(-3) are 0.61 (+0.07)(-0.06), 0.64(-0.09)(+0-13), 0.42(-0.13)(+0.27) and 0.54(-0.15)(+0.30), respectively. (C) 2004 Elsevier Inc. All riahts reserved.
机构:
Sao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP, BrazilSao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP, Brazil
Giuliatti Winter, S. M.
Madeira, G.
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Sao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP, BrazilSao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP, Brazil
Madeira, G.
Sfair, R.
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Sao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP, BrazilSao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP, Brazil
机构:
Queen Mary Univ London, Astron Unit, Sch Phys & Astron, London E1 4NS, EnglandQueen Mary Univ London, Astron Unit, Sch Phys & Astron, London E1 4NS, England
Cooper, N. J.
Murray, C. D.
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Queen Mary Univ London, Astron Unit, Sch Phys & Astron, London E1 4NS, EnglandQueen Mary Univ London, Astron Unit, Sch Phys & Astron, London E1 4NS, England
Murray, C. D.
Williams, G. A.
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Queen Mary Univ London, Astron Unit, Sch Phys & Astron, London E1 4NS, EnglandQueen Mary Univ London, Astron Unit, Sch Phys & Astron, London E1 4NS, England