List of minor planets and comets visited by spacecraft

The following tables list all minor planets and comets that have been visited by spacecraft.

List of minor planets visited by spacecraft

Since the 1990s, a total of 13 minor planets – currently all of them are asteroids and dwarf planets – have been visited by space probes. Note that moons (not directly orbiting the Sun), comets and planets are not minor planets and thus are not included in the table below.

In addition to the listed objects, three asteroids have been imaged by spacecraft at distances too large to resolve features (over 100,000 km), and are hence not considered "visited". Asteroid 132524 APL was imaged by New Horizons in 2006 at a distance of 101,867 km, 2685 Masursky by Cassini in 2000 at a distance of 1,600,000 km, and 307 Nike by Pioneer 10 in 1972 at a distance of 8,800,000 km. The Hubble Space Telescope, a spacecraft in Earth orbit, has imaged several large asteroids, including 2 Pallas and 3 Juno.

Minor planet Space probe
Name Image Dimensions
(km) (a)		 Discovery
year		 Name Closest approach Remarks
year in km in radii (b)
1 Ceres
952 1801 Dawn 2015–present 200
approx.
(planned)
 0.42 first "close up" picture of Ceres taken in December 2014; probe entered orbit in March 2015; first dwarf planet visited by a spacecraft, largest asteroid visited by a spacecraft
4 Vesta 529 1807 Dawn 2011–2012 200
approx.
 0.76 space probe broke orbit on 5 September 2012 and headed to Ceres; first "big four" asteroid visited by a spacecraft, largest asteroid visited by a spacecraft at the time
21 Lutetia
120×100×80 1852 Rosetta 2010 3,162 64.9 flyby on 10 July 2010; largest asteroid visited by a spacecraft at the time
243 Ida
56×24×21 1884 Galileo 1993 2,390 152 flyby; discovered Dactyl; first asteroid with a moon visited by a spacecraft, largest asteroid visited by spacecraft at the time
253 Mathilde
66×48×46 1885 NEAR Shoemaker 1997 1,212 49.5 flyby; largest asteroid visited by a spacecraft at the time
433 Eros
34×11×11 1898 NEAR Shoemaker 1998–2001 0 0 1998 flyby; 2000 orbited (first asteroid studied from orbit); 2001 landing; first asteroid landing, first asteroid orbited by a spacecraft, first near-Earth asteroid (NEA) visited by a spacecraft
951 Gaspra
18.2×10.5×8.9 1916 Galileo 1991 1,600 262 flyby; first asteroid visited by a spacecraft
2867 Šteins
4.6 1969 Rosetta 2008 800 302 flyby; first asteroid visited by the ESA
4179 Toutatis
4.5×~2 1934 Chang'e 2 2012 3.2 0.70 flyby;[1] closest asteroid flyby, first asteroid visited by a Chinese probe
5535 Annefrank
4.0 1942 Stardust 2002 3,079 1230 flyby
9969 Braille
2.2×0.6 1992 Deep Space 1 1999 26 12.7 flyby; followed by flyby of Comet Borrelly; failure, missed it during flyby
25143 Itokawa 0.5×0.3×0.2 1998 Hayabusa 2005 0 0 landed; returned dust samples to Earth in 2010 - first sample return mission from asteroid; smallest asteroid visited by a spacecraft, first asteroid visited by a non-NASA spacecraft
134340 Pluto
2,370 1930 New Horizons 2015 12,500 10.5 flyby; first trans-Neptunian object visited, most distant object visited by a spacecraft
Notes:
a A minor planet's dimensions may be described by x, y, and z axes instead of an (average) diameter due to its non-spherical, irregular shape.
b Closest approach given in multiples of the minor planet's mean radius
 ·  Default order of list: by the minor planet's designation, ascending.

List of comets visited by spacecraft

Comet Space probe
Name Image Dimensions
(km) (a)		 Discovery
year		 Name Closest approach Remarks
year in km in radii (b)
Giacobini–Zinner
2 1900 ICE 1985 7,800 7,800 first flyby of comet
Halley
15×9 Known
since
antiquity		 Vega 1 1986 8,889 1,620 flyby
Vega 2 1986 8,030 1,460 flyby
Suisei 1986 151,000 27,450 distant flyby
Sakigake 1986 6,990,000 1,270,747 distant flyby
Giotto 1986 596 108 flyby; first direct images of a comet nucleus
Grigg–Skjellerup
2.6 1902 Giotto 1992 200 154 flyby
Borrelly
8×4×4 1904 Deep Space 1 2001 2,171 814 flyby; closest approach in September 2001 when probe entered the comet's coma[2]
Wild 2
5.5×4.0×3.3 1978 Stardust 2004 240 113 flyby; first sample return mission from comet to Earth (2006)
Tempel 1
7.6×4.9 1867 Deep Impact 2005 500 80 flyby; delivered an impactor
Deep Impact's impactor vehicle 2005 0 0 first landing on a comet (blasted a crater)
Stardust 2011 181 57.9 flyby; imaged the crater created by Deep Impact
C/2006 P1 ? 2006 Ulysses 2007 260 million ? unexpected ride through the comet's tail; detected complex chemistry; solar wind speed was halved
Hartley 2
1.4 1986 EPOXI
(was Deep Impact)		 2010 700 1,000 flyby; smallest comet visited
Churyumov–Gerasimenko
4.1×3.3×1.8 1969 Rosetta 2016 0 0 first orbiter of comet (November 2014); impacted surface as of 2016; OSIRIS captured image with 11 cm/px-resolution in Spring 2015[3]
Philae
(Rosetta's lander)		 2014 0 0 first soft landing on a comet (November 2014)
Notes:
(a) Due to a non-spherical, irregular shape, a comet's x, y, and z axes instead of an (average) diameter are often used to describe its dimensions.
(b) Closest approach given in multiples of the comet's (average mean) radius
 ·  List ordered in descending order by a comet's first visit

Spacecraft visited by comets

Comet C/2013 A1 passed close by Mars in October 2014, closer than the Moon is to Earth.[4] As of early 2014 it was calculated to pass as close as 0.00087 AU (130,000 km; 81,000 mi).[4] This was so close that the event was deemed dangerous to spacecraft in orbit around Mars.[5] Spacecraft that were active at that time included 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.

Planned visits

List of minor planets targeted for spacecraft visitation

The following table lists minor planets that are planned to be visited by spacecraft. NASA's Lucy spacecraft is scheduled to tour several Jupiter trojans and one main-belt asteroid between 2025 and 2033.[6]

Name Diameter(a)
(km) 		Year of
discovery 		Spacecraft Agency Year of
visit 		Notes
16 Psyche 186 1852 Psyche NASA 2026 Future planned orbiting
617 Patroclus 141 1906 Lucy NASA 2033 Jupiter trojan, Trojan camp, binary system with satellite, 5th largest Jupiter trojan
3548 Eurybates 72 1973 Lucy NASA 2027 Jupiter trojan, Greek camp
11351 Leucus 42 1997 Lucy NASA 2028 Jupiter trojan, Greek camp, a slow rotator
15094 Polymele 21 1999 Lucy NASA 2027 Jupiter trojan, Greek camp
21900 Orus 53 1999 Lucy NASA 2028 Jupiter trojan, Greek camp
52246 Donaldjohanson 4 1981 Lucy NASA 2025 inner main-belt
65803 Didymos 1 1996 AIDA ESA 2022 Proposal[7][8]
101955 Bennu 0.5 1999 OSIRIS-REx NASA 2020 Future planned landing
162173 Ryugu 1 1999 Hayabusa 2 JAXA 2018 Orbit expected June 2018 – December 2019. Several landers and sample collecting touchdowns planned.
(486958) 2014 MU69 35 2014 New Horizons NASA 2019 Flyby – 1 January 2019[9]
(a) given diameters are estimates
Note: asteroids that come to close enough to Earth can sometimes be observed, such as 4769 Castalia. (See List of asteroid close approaches to Earth.)

List of minor planets formerly targeted for spacecraft visitation

Former targets (were at one time proposed as a target).

Name Diameter
(km)		 Body Discovered Spacecraft Year Notes
Siwa, 140140 Siwa 103 October 13, 1874 Rosetta 2007 target changed due to launch postponement[10]
Adeona, 145145 Adeona 151 June 3, 1875 Dawn 2016 abandoned target
Hamburga, 449449 Hamburga 86 October 31, 1899 CRAF 1998 mission cancelled
Geographos, 16201620 Geographos 5.1×1.8 September 14, 1951 Clementine 1995 mission failed before retargeting
van Albada, 20192019 van Albada n.a. September 28, 1935 NEAR 1998 abandoned target
Shipka, 25302530 Shipka n.a. July 9, 1978 Rosetta 2007 secondary target changed for better trajectory[10]
Rodari, 27032703 Rodari n.a. March 29, 1979 Rosetta 2007 target in early mission planning but not chosen[10]
McAuliffe, 33523352 McAuliffe 2–5 February 6, 1981 Deep Space 1 1998 abandoned target
Mimistrobell, 38403840 Mimistrobell n.a. October 9, 1980 Rosetta 2007 target changed[10]
Wilson–Harrington, 40154015 Wilson–Harrington 4 November 19, 1949 Deep Space 1
Hayabusa Mk2		 1999
2022		 abandoned target, also a comet
mission cancelled
Nereus, 46604660 Nereus ~1 February 28, 1982 NEAR
NEAP
Hayabusa		 1997 abandoned target
mission cancelled
abandoned target
Otawara, 49794979 Otawara 5.5 August 2, 1949 Rosetta 2007 target changed due to launch postponement[10]
(10302) 1989 ML n.a. June 29, 1989 Hayabusa 2002 abandoned target
(163249) 2002 GT n.a. April 3, 2002 Deep Impact 2020 communications with spacecraft lost
(185851) 2000 DP107 ~0.8 February 29, 2000 PROCYON 2016 ion engine failure in heliocentric orbit[11]

References

  1. ↑ "Chang'E 2 images of Toutatis".
  2. ↑ "Deep Space 1 – NSSDC/COSPAR ID: 1998-061A". NASA. 26 August 2014. Retrieved 1 July 2015.
  3. ↑ "Rosetta Spacecraft Sees Its Shadow on a Comet (Photo)". Space.com. 5 March 2015. Rosetta flew just 3.7 miles (6 kilometers) from Comet 67P's surface, resulting in a resolution of 4.3 inches (11 centimeters) per pixel [for OSIRIS].
  4. 1 2 "JPL Close-Approach Data: C/2013 A1 (Siding Spring)". 2014-02-09. Retrieved 2013-02-19. last obs (arc=493 days w/619 obs)
  5. ↑ 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.
  6. ↑ Levison, H. F.; Olkin, C.; Noll, K. S.; Marchi, S.; Lucy Team (March 2017). "Lucy: Surveying the Diversity of the Trojan Asteroids: The Fossils of Planet Formation" (PDF). 48th Lunar and Planetary Science Conference. Bibcode:2017LPI....48.2025L. Retrieved 13 April 2017.
  7. ↑ Asteroid Impact & Deflection Assessment (AIDA) study Archived 2015-06-07 at the Wayback Machine..
  8. ↑ Miriam Kramer (26 March 2013). "Asteroid Deflection Mission AIDA Set To Crash Two Spacecraft Into Space Rock In 2022". Huffington Post. Retrieved 19 September 2014.
  9. ↑ Talbert, Tricia. "NASA’s New Horizons Team Selects Potential Kuiper Belt Flyby Target". www.nasa.gov. Retrieved 29 August 2015.
  10. 1 2 3 4 5 Luigi Colangeli, Elena Mazzotta Epifani, Pasquale Palumbo, The New Rosetta Targets: Observations, Simulations and Instrument Performances, pp. 71-72, Springer Verlag, 2013.
  11. ↑ "Due to ion engine failure, PROCYON will not fly by an asteroid".
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