Juno is the second orbiter mission to Jupiter, following the Galileo Orbiter mission (1995 - 2003), and will arrive at Jupiter twenty years after Galileo. Pioneer 10 was the first space mission to fly past Jupiter in 1973, followed by its twin, Pioneer 11 in 1974. Both Pioneer10 and 11 were spin stabilized planetary spacecraft like Juno, but unlike Juno which is powered by solar cells, were powered by radioactive thermal generation batteries. The JunoCam imager will also share something more with its spinning cousins, the Pioneers - imaging using spin-scan technique.
Besides the solar system missions, other space observatories in earth orbit have also observed Jupiter and its moons. Follow the links in the left navigation bar to learn more about what these missions have discovered about Jupiter.
| Past Missions | Launch Date | Encounter Date |
|---|---|---|
| Pioneer 10 | 1972, March 02 | 1973, December 03 |
| Pioneer 11 | 1973, April 05 | 1974, December 04 |
| Voyager 1 | 1977, September 05 | 1979, March 05 |
| Voyager 2 | 1977, August 20 | 1979, July 09 |
| Ulysses | 1990, October 06 | 1992, February ~2004, March |
| Galileo Entry Probe | 1989, October 18 | 1995, December 07 |
| Galileo Orbiter | 1989, October 18 | 1995, December 07 |
| Cassini Mission Fly-by | 1997, October 15 | 2000, December 30 |
| New Horizons Mission Fly-by | 2006, January 19 | 2007, February |
