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Masses of the Trojan Groups of Jupiter

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Abstract

The possibility of obtaining dynamical estimates of the total masses in the two Trojan asteroid groups of Jupiter is investigated. The compact Greek (L4) and Trojan (L5) groups contain several tens of thousands of asteroids near the stable Lagrange points moving in a 1: 1 resonance with the orbital motion of Jupiter. The dynamical mass estimates

$$\begin{array}{*{20}{c}} {{M_{L4}} = (8.63 \pm 0.51) \times {{10}^{ - 6}}{M_ \oplus },} \\ {{M_{L5}} = (5.46 \pm 0.54) \times {{10}^{ - 6}}{M_ \oplus }} \end{array}$$

have been obtained by processing more than 800 thousand observations of planets and spacecraft using the new EPM2019 version of planetary ephemerides created at IAA RAS.

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Acknowledgments

We thank D.A. Pavlov for the development of the ERA software package that allowed us to take an important step in developing the EPM ephemerides and the EPM2019 version: including the additional gravitational accelerations from the Trojans in the general model to integrate the differential equations; integrating the isochronous derivatives.

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Correspondence to E. V. Pitjeva.

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Russian Text © The Author(s), 2019, published in Pis’ma v Astronomicheskii Zhurnal, 2019, Vol. 45, No. 12, pp. 902–908.

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Pitjeva, E.V., Pitjev, N.P. Masses of the Trojan Groups of Jupiter. Astron. Lett. 45, 855–860 (2019). https://doi.org/10.1134/S1063773719120041

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