ИСТИНА

Spatial mission design of low-cost Delta V gravity assists tours for the Jovian moons exploration is considered, taking radiation hazard into account. The future space missions—the Laplace-P project of Roskosmos with the possible cooperation with the ESA’s JUICE project which involves a landing on one of Jovian moons must be very refined. This is caused by a fact that the necessary cruise, flyby, and landing on the Jovian moon imply multiple reductions in the approach velocity of the spacecraft (SC), which, in view of contemporary restrictions for propellant consumption, can be ensured only by using of gravity assist maneuvers (GAMs) near Jovian moons. For these projects the execution of limitations on a mission duration, minimization of the level of total ionizing dose (TID) of radiation, and the delta V budget are required. The urgency of the creating a regular procedure for the construction of optimal scenarios or schedules of flybys of the appropriate celestial bodies and the development of conditions for executing of these schedules becomes evident. Advanced of the 3D construction methodology for such scenarios taking into account the spatial model of the Jovian radiation is descripted. The reduction of the SC’s asymptotic velocity relative the satellite for the moon’s capture is impossible. A valid reason is in the invariance of the Jacobi integral and the Tisserand parameter in the restricted three-body problem model (R3BP). Formalized spatial beam’s algorithm of multibody GAMs used the refined ephemeris model has been implemented. Advanced modifications of the spatial Tisserand-Poincare graph for this purpose are introduced taking into account the 3D Divine/GIRE model of the Jovian radiation. Tisserand parameters of SC in several local R3BP for this purpose are used. The Multi-Tisserand graphs based on them are built. It is shown that the "cross" gravity assists at the early stage of SC’s orbital energy reduction for TID-comfortable tours are required. As a result, a reasonable increase in the duration of the mission for Jovian moons exploration can be exchanged on a sharp decline TID and "comfortable" spatial 3D tours can be found in the Jovian system: less than 65 Krad for standard SC protection 8 mm Al.