Descripción : This mission was the first to be sent to the outer solar system and the first to investigate the planet Jupiter, after which it followed an escape trajectory from the solar system. The spacecraft achieved its closest approach to Jupiter on 04 December 1973, when it reached approximately 2.8 Jovian radii (about 200,000 km). As of 01 January 1997 Pioneer 10 was at about 67 AU from the Sun near the ecliptic plane and heading outward from the Sun at 2.6 AU/year and downstream through the heliomagnetosphere towards the tail region and interstellar space. This solar system escape direction is unique because the Voyager 1 and 2 spacecraft (and the now terminated Pioneer 11 spacecraft mission) are heading in the opposite direction towards the nose of the heliosphere in the upstream direction relative to the inflowing interstellar gas. The spacecraft is heading generally towards the red star Aldebaran, which forms the eye of Taurus (The Bull). The journey over a distance of 68 light years to Aldebaran will require about two million years to complete.
Cap Canaveral post stamp and Pioneer 10 sonde.

USA 574 - picture enhanced ?

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PIONEER 10 (OUTER PLANETS PROBE) · THROUGH THE ASTEROID BELT