List of comets visited by spacecraft
|Comet||Year of discovery||Spacecraft||Year of visit||Closest approach (km)||Notes|
|Halley||Known since antiquity||Vega 1||1986||8889||Flyby|
|Borrelly||1904||Deep Space 1||2001||?||Flyby|
|Wild 2||1978||Stardust||2004||240||Flyby; returned samples to Earth|
|Tempel 1||1867||Deep Impact||2005||Impacted||Flyby; blasted a crater using an impactor|
(was Deep Impact)
|2010||700||Flyby; smallest comet visited|
|Tempel 1||1867||Stardust||2011||181||Flyby; imaged the crater created by Deep Impact|
|Churyumov–Gerasimenko||1969||Rosetta||2014||?||Orbit and landing planned|
Spacecraft visited by comets
It was determined that Comet C/2013 A1 will pass close by Mars in October 2014, closer than the Moon is to Earth.  As of early 2014 it was calculated to pass as close as 0.00087 AU (130,000 km; 81,000 mi). This is so close that the event may threaten spacecraft in orbit around Mars. Spacecraft that may be active at that time include 2001 Mars Odyssey, Mars Express, MAVEN, Mars Orbiter Mission, and Mars Reconnaissance Orbiter in Mars orbit – and two on the surface – Mars Exploration Rover Opportunity and the Mars Science Laboratory Curiosity.
- "JPL Close-Approach Data: C/2013 A1 (Siding Spring)". 2014-02-09 last obs (arc=493 days w/619 obs). Retrieved 2013-02-19.
- Grossman, Lisa (6 December 2013). "Fiercest meteor shower on record to hit Mars via comet". New Scientist. Archived from the original on 2013-12-12.