Reduced χ2 value as a function of assumed inflow longitude (J2000) for the Ulysses cruise phase, three polar orbits fitted separately (solid lines), and the three polar orbits fitted together (broken line). The optimum solutions correspond to the minima. The reduced χ2 value obtained from simulating all three polar orbits with the parameters taken from Witte (2004) is marked with the black cross sign. The poorly matching red line is obtained from the very few data frames collected shortly after launch, during the in-ecliptic cruise phase to Jupiter.
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