There are a few probes which don't fit the same classification as the others. Their main objective is asteroids, comets, or dwarf planets, not the sun, moon, or planets. Not mentioned here is Galileo (primarily a Jupiter probe).

• International Sun-Earth Explorer 3 (Explorer 59, International Cometary Explorer, ICE,   International Sun-Earth Explorer-C, ISEE-C) (USA)  12 August 1978. Launched as ISEE 3, it was first kept at the Lagrangian point between the Earth and the Sun. ISEE 3 was then moved from this orbit and made transits through the Earth's geomagnetic tail from September 1982 until December 22, 1983, when it made a very close swing-by of the Moon and began its cometary mission (and was given the new name ICE for International Cometary Explorer) to the comet Giacobini-Zinner. Operations terminated on May 5, 1997. It remains in a heliospheric orbit.
• Vega 1 (USSR)  15 December 1984. A probe which dropped off components at Venus while on the way to a rendezvous with Halley's comet on 6 March 1986. Now in solar orbit.
• Vega 2 (USSR)  21 December 1984. A probe which dropped off components at Venus while on the way to a rendezvous with Halley's comet on 9 March 1986. Now in solar orbit.
• SS-10 Sakigake ( MS-T5, Pioneer) (Japan)  7 January 1985. Japanese flyby of Halley's comet at about 7 million kilometers on 11 March 1986.
• Giotto (ESA)  2 July 1985. European probe to comet Halley (596 km on 13 March 1986) and comet Grigg-Skjellerup (200 km on 10 July 1992).
• SS-11 Suisei (Comet, Planet-A) (Japan)  18 August 1985. Japanese flyby of Halley's comet (151,000 km on 8 March 1986).
• NEAR (Near Earth Asteroid Rendezvous) (USA) 17 February 1996. Explores near Earth asteroids. A controlled crash landing on Asteroid 433 Eros was successfully executed on February 12, 2001. Data was returned for several days thereafter. Final communication came on February 28, 2001.
• Deep Space 1 (DS1,  New Millennium DS1) (USA)   24 October 1998. During a highly successful primary mission, it tested 12 advanced, high-risk technologies in space. In an extremely successful extended mission, it encountered Comet Borrelly (September 22, 2001) and returned the best images and other science data ever from a comet. During its fully successful hyperextended mission, it conducted further technology tests. The spacecraft was retired on December 18, 2001. It remains in solar orbit.
• Stardust ( Stardust Sample Return) (USA)  7 February 1999. This probe collected dust from Comet Wild 2 (encountered on January 2, 2004) and successfully returned the samples to Earth on 15 January 2006. The Stardust vehicle itself remains in a solar orbit awaiting future use.
• WMAP (Wilkinson Microwave Anisotropy Probe) (USA)   30 June 2001. This spacecraft headed for Lagrange point 2 where it arrived October 1, 2001. It is in a somewhat stable position on a line from the sun to the earth to the probe (approximately 1.5 million km from the Earth).
  Microwave Sky Image from WMAP
• Contour (Comet Nucleus Tour) (USA)  3 July 2002. The spacecraft was to fly within 62 miles of the inner core of at least two comets. It remained in Earth orbit until August 15, 2002, when it disappeared after the engines were fired to send it into deep space. It is assumed to have disintegrated.
• Muses-C (renamed Hayabusa, or Falcon) (Japan)   9 May 2003. This Japanese spacecraft landed on the asteroid Itokawa 25 November 2005. It is not clear if the effort to collect samples succeeded. After the vehicle took off again, thruster problems put the vehicle in safe mode. Efforts to regain control were only partially successful so the return to Earth in the summer of 2007 is uncertain.
• Rosetta (ESA)  2 March 2004. Cometary probe which will reach the comet 67P/Churyumov-Gerasimenko in 2014 after three flybys of the Earth and one of Mars. Currently in solar orbit.
• New Horizons (USA)   19 January 2006. Will fly 2.3 million km of Jupiter (28 February 2007) and reach the Pluto/Charon system in 2015. There could also be other Kuiper Belt Object flybys around 2017. New Horizons is the fastest probe ever launched.
• Dawn (USA)   27 September 2007. NASA planetary mission to visit two asteroids, Vesta and Ceres. A Mars fly-by (for gravity assist) is scheduled for February 2009,