Back 25143 Itokawa Afrikaans إيتوكاوا 25143 Arabic إيتوكاوا 25143 ARZ (25143) Ітакава Byelorussian 25143 Itokawa BS (25143) Itokawa Catalan Itokawa (planetka) Czech (25143) Itokawa Danish (25143) Itokawa German 25143 Itokawa Esperanto

25143 Itokawa

25143 Itokawa
Image of Itokawa from the Hayabusa spacecraft
Image of Itokawa from the Hayabusa spacecraft
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date26 September 1998
Designations
(25143) Itokawa
Pronunciation/ˌiːtoʊˈkɑːwə/
Japanese: [itoꜜkawa]
Named after
Hideo Itokawa[2]
1998 SF36
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc20.38 yr (7,443 d)
Aphelion1.6951 AU
Perihelion0.9532 AU
1.3241 AU
Eccentricity0.2801
1.52 yr (557 d)
288.88°
0° 38m 48.48s / day
Inclination1.6214°
69.081°
162.82°
Earth MOID0.0131 AU (5.10 LD)
Physical characteristics
Dimensions535 m × 294 m × 209 m[4]
313 m[5]
330 m[3]
350 m[6][7]
Mass(3.51±0.105)×1010 kg[4]
(3.58±0.18)×1010 kg[8]
Mean density
1.9±0.13 g/cm3[4]
1.95±0.14 g/cm3[8]
12.132 h[6][9]
0.23[7]
0.283±0.116[5]
0.36±0.22[10]
0.53[11]
18.61[14] · 18.95 (R)[15]
19.00[13] · 19.2[1][3]
19.48[6][7] · 19.51±0.09[5]

25143 Itokawa (provisional designation 1998 SF36) is a sub-kilometer near-Earth object of the Apollo group and a potentially hazardous asteroid. It was discovered by the LINEAR program in 1998 and later named after Japanese rocket engineer Hideo Itokawa.[1] The peanut-shaped S-type asteroid has a rotation period of 12.1 hours and measures approximately 330 meters (1,100 feet) in diameter. Due to its low density and high porosity, Itokawa is considered to be a rubble pile, consisting of numerous boulders of different sizes rather than of a single solid body.

It was the first asteroid to be the target of a sample-return mission, of the Japanese space probe Hayabusa, which collected more than 1500 regolith dust particles from the asteroid's surface in 2005. Since its return to Earth in 2010, the mineralogy, petrography, chemistry, and isotope ratios of these particles have been studied in detail, providing insights into the evolution of the Solar System. Itokawa was the smallest asteroid to be photographed and visited by a spacecraft prior to the DART mission to Dimorphos in 2022.

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  2. ^ Cite error: The named reference springer was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference jpldata was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Fujiwara-2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Mueller-2011a was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference lcdb was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Sekiguchi-2003 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Abe-2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Kaasalainen-2003 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Thomas-2011b was invoked but never defined (see the help page).
  11. ^ S. M. Lederer, et al., "Physical characteristics of Hayabusa target Asteroid 25143 Itokawa", Icarus, v. 173, pp. 153–165 (2005)
  12. ^ Cite error: The named reference Thomas-2014 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Carry-2016 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Dermawan-2002 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Nishihara-2005 was invoked but never defined (see the help page).

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