The Near-Earth asteroid 25143 Itokawa was visited by the Japanese spacecraft mission, Hayabusa (Fujiwara et al., 2006). The probe arrived in the vicinity of Itokawa on 12 September 2005 and initially "parked" in an asteroid–Sun line at 20 km (12 mi), and later 7 km (4.3 mi), from the asteroid (Itokawa's gravity was too weak to provide an orbit, so the spacecraft adjusted its orbit around the Sun until it matched the asteroid's). The first Hayabusa mission (Hayabusa1), launched on 9 th May 2003, was designed to collect samples from asteroid 25143 Itokawa. Itokawa was found to be about 350m in diameter. The gravitational accelerations from the Sun and the planets are well known, so we should estimate the solar radiation pressure and the gravitational attraction from Itokawa separately. The surface of asteroid 25143 Itokawa is covered with numerous boulders although gravity is very small compared with that of other asteroids previously observed from spacecraft.

Scientists think Itokawa is not solid, but rather is a rubble pile, an agglomeration of rocks loosely held together by their mutual gravity. The Hayabusa spacecraft w hich visited the asteroid 25143 Itokawa modeled its gravity field during close proximity. Radar observations of this asteroid also suggest a shape and gravity field model. On 25 November, a sec…

The regolith of the smooth-surface zone, which lays from the South pole to the North pole of Itokawa, has possibly gathered corresponding to the gravity distribution on the surface. The Dynamical Environment About Asteroid 25143 Itokawa: Target of the Hayabusa Mission D.J. From its perch in space it maneuvered around the object (its gravity field was too small to really orbit it), taking breathtaking images and making spectroscopic observations. Overview. gravity from Itokawa, the solar radiation pressure, and the gravity from other celestial bodies, such as the sun and planets. Then we can know the mass of Itokawa. The surface of asteroid 25143 Itokawa is covered with numerous boulders although gravity is very small compared with that of other asteroids previously observed from spacecraft. It used solar-powered ion engines to propel itself to asteroid 25143 Itokawa, arriving at a position only seven kilometers from the asteroid on October 4, 2005. Hayabusa MUSES-C is the asteroid sample return mission of Japan It was launched on May 9 2003 and it arrived at its destination Asteroid 25143 Itokawa on September 12 2005 For about three months Hayabusa made detailed observations of Itokawa and tried to touch down on its surface twice after several rehearsal approaches In this mission period Hayabusa was under the effect of gravity … Analysis of performance in constant density models for asteroid 25143 Itokawa and comet 67/P Churyumov-Gerasimenko show that ELM-based SLFN are able learn the …