of the first, third and fourth orbits of Juno around Jupiter. Using the method described in the previous section we will focus on the region around the perijove in order to unveil any possible anomalies in the trajectory as they have already been found in close flybys of the Earth [@Anderson2008]. We have not considered the second flyby in which a period reduction manoeuver was planned but, later on, cancelled because the helium check valves were not operating properly [@Junovalve]. Consequently, the spacecraft was set into safe mode during that particular flyby.

We considered the telemetry data for the first flyby starting from August, 26th at $00\mbox{:}00.000$ Barycentric dynamical time (TDB). From such reference the minimum distance to the center of Jupiter was attained at minute $t_P=2212$. The spatial coordinates and velocity at that instant were taken as the initial conditions for our integration procedure.

![Comparison among the distance to the center of Jupiter of the Juno spacecraft during the first flyby (open circles) and the ideal hyperbolic approximation (solid line). Coordinate $r$ is measured in km and time in minutes since the initial condition close to the perijove.[]{data-label="fig1"}](Figure1.eps){width="\columnwidth"}

If we ignore the perturbation terms in Eqs. (\[eqmotionr\])-(\[eqmotionv\]) we obtain 