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Topic: 25143 Itokawa

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	25143 Itokawa - Wikipedia, the free encyclopedia
		25143 Itokawa (IPA [itokawa], Japanese 糸川) is an Apollo and Mars-crosser asteroid.
		Itokawa was discovered in 1998 by the LINEAR project.
		The Japanese probe Hayabusa arrived in the vicinity of Itokawa on September 12, 2005 and initially "parked" in an asteroid-sun line at 20 km, and later 7 km, from the asteroid.
	en.wikipedia.org /wiki/25143_Itokawa (532 words)

	Hideo Itokawa - Wikipedia, the free encyclopedia
		The asteroid 25143 Itokawa, named in honor of Itokawa, is notable as the target of the Hayabusa mission.
		Itokawa was a genius who skipped grades in school and studied many topics.
		Topics that Itokawa became interested in or took as a hobby, include such sports as basketball, golf and swimming, as well as orchestral arrangements and such instruments as cello, harmonica, organ, piano, violin and taishokin (a type of xylophone).
	en.wikipedia.org /wiki/Hideo_Itokawa (251 words)

	Itokawa (minor planet 25143)
		25143 Itokawa, also known as 1998 SF36, was discovered by LINEAR in 1998 and is named after the late Dr. Hideo Itokawa, considered one of the fathers of Japan's space program.
		Itokawa's edges appear rounded, possibly the result of eons of being pelted by other space objects.
		It is strongly suspected from its appearance that Itokawa may be a rubble-pile asteroid.
	www.daviddarling.info /encyclopedia/I/Itokawa.html (302 words)

	[32.09] Improved NASA Infrared Telescope Facility (IRTF) Spectral Reduction Procedures and Compositional Results of ... (Site not responding. Last check: 2007-10-09)
		The Japanese Hayabusa (MUSES-C) spacecraft, launched in 2003, is slated to encounter asteroid 25143 Itokawa in the fall of 2005.
		Analyses of the data obtained suggest that Itokawa’s surface is composed of an olivine and orthopyroxene mineralogy.
		These pyroxene compositions are suggestive of phases crystallized from partial melts, which indicates that the parent body of 25143 Itokawa reached temperatures sufficient to initiate partial melting, but it did not attain the degree of melting required for significant melt mobilization.
	www.aas.org /publications/baas/v36n4/dps2004/310.htm (372 words)

	[14.12] Long Term Dynamics of the Asteroid (25143) Itokawa to be Sampled by the Spacecraft HAYABUSA (Site not responding. Last check: 2007-10-09)
		We have studied numerically the dynamical evolution of the asteroid (25143) Itokawa from which, for the first time, a sample is planed to be brought back to Earth in 2007 by the Japanese space probe HAYABUSA launched in May 2003.
		Beause of the chaotic nature of Itokawa's orbit, we performed a statistical study of its long term dynamics by integrating numerically over their whole dynamical lifetimes several initially ``indistinguishable" orbits (``clones"), obtained by small variations of the nominal initial conditions.
		We conclude that Itokawa is not a dynamically peculiar body and may well represent a typical NEO, which probably came on its orbit from the main belt, as suggested by its S spetral type which the most common type in the inner Solar System.
	www.aas.org /publications/baas/v37n3/dps2005/196.htm (371 words)

	Asteroid Sample-return Spacecraft "HAYABUSA" (MUSES-C) (Site not responding. Last check: 2007-10-09)
		Itokawa : 9/4 02:36 UTC (1), 9/6 03:32 UTC (2).
		Itokawa's rotation period is known to be approximately 12 hours by ground-based observations.
		At the end of operations on September 1, the distance to the Itokawa was 1,900 km and Hayabusa was moving toward it at a velocity of 18 km per hour.
	www.jaxa.jp /missions/projects/sat/exploration/muses_c/backnumber_e.html (3707 words)

	Hideo Itokawa - Indopedia, the Indological knowledgebase
		Hideo Itokawa (糸川英夫) (1912–1999) was a pioneer of Japanese rocketry and the Japanese space program.
		Itokawa was a genius skipping elementary grades and studied many topics.
		The asteroid 25143 Itokawa is named after him.
	www.indopedia.org /Hideo_Itokawa.html (228 words)

	Hayabusa - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-09)
		In 2003, while Hayabusa was en-route to Itokawa, a large solar flare damaged the solar cells aboard the spacecraft.
		On November 7, Hayabusa was 7.5 km from Itokawa.
		On December 6, Hayabusa was 550km from Itokawa.
	www.knowledgehunter.info /wiki/Hayabusa (2701 words)

	BBC NEWS \| Science/Nature \| Probe yields Earth defence clues
		Data from the mission suggests Itokawa could be a relatively young body formed out of debris from the collision of two larger objects.
		Itokawa's "rubble pile" structure (it is estimated to be 40% porous) holds the key to how it was created.
		"Itokawa's age is probably in the order of several million years; so it is relatively young," Hayabusa mission manager Jun'ichiro Kawaguchi told the BBC News website.
	news.bbc.co.uk /2/hi/science/nature/4823526.stm (771 words)

	Tumbling Stone 22 - NEOs' spacemissions - Haybusa (Site not responding. Last check: 2007-10-09)
		The only difference in Itokawa as compared to the meteorites is a slight reddening that could be caused by minor surface alteration processes occurring in interplanetary space, a theory consistent with the findings from the visible wavelength studies.
		The average percentage of light reflected from main belt S-types is 20 percent, while Itokawa's is somewhere between 23 and 53 percent, depending on the measurement methods used and assumptions made.
		Measurements of Itokawa in the thermal infrared reveal higher values of thermal inertia than expected for most S-type asteroids, indicating a very thin surface regolith and/or the presence of exposed bare rocks.
	spaceguard.esa.int /tumblingstone/issues/num22/eng/musesc1.htm (1722 words)

	Astronomy News
		Itokawa's gravity is so faint that the probe won’t even bother to orbit the asteroid.
		Itokawa's shape and density are uncertain, and its 12-hour rotation period creates extra navigation hazards during the Hayabusa probe's slow approach.
		The distance from Hayabusa to Itokawa is approximately 30 km.
	www.activeboard.com /forum.spark?forumID=58381&subForumID=150688&action=viewTopic&commentID=3191136&topicPage= (2211 words)

	Probe fails to land on asteroid (Site not responding. Last check: 2007-10-09)
		The unmanned Hayabusa (Japanese for "falcon," had been scheduled to touch down on the surface of the 548-metre-long 25143 Itokawa for just one second after a voyage of two and a half years.
		Hayabusa was to have landed on Itokawa for just long enough to allow it to fire a metal pellet into its surface and collect a sample of the material stirred up by the impact.
		Itokawa is named after pioneering Japanese rocket scientist Hideo Itokawa.
	www.leadingthecharge.com /stories/news-00102353.html (513 words)

	Asteroid Itokawa
		The sharp contrast between the surfaces of some asteroids and comets is underscored by recent images of asteroid Itokawa.
		Though the probe was unable to complete two planned landings to gather dust samples from the asteroid, it did produce high quality pictures of the asteroid’s surface that are now the subject of much debate among astronomers.
		Asteroids that have no cratering (Itokawa being the case par excellence) are more likely to have acquired a boulder-strewn surface subsequent to their violent birth, but that does not make them just a heap of rubble.
	www.thunderbolts.info /tpod/2006/arch06/060328itokawa.htm (757 words)

	Database of Near-Earth Asteroids
		(Comparison of ground-based lightcurve observations of (25143) Itokawa with synthetic lightcurves generated from asteroid shape models)
		(2001) B.A.A.S. (CCD observations of asteroid 1998 SF36 (25143))
		(2001) B.A.A.S. (Radar observations of asteroid 25143 1998 SF36)
	earn.dlr.de /nea/025143.htm (396 words)

	Abstracts 39-3 March 2004
		We observed 25143 Itokawa, the target of Japan’s Hayabusa (MUSES-C) sample-return mission, during its 2001 close approach at Arecibo on twelve dates during March 18–April 9 and at Goldstone on nine dates during March 20–April 2.
		Itokawa’s average circular polarization ratio at 13 cm, 0.26 ± 0.04, is comparable to that of Eros, so its cm-to-m surface roughness probably is comparable to that on Eros.
		Itokawa’s topography is very subdued compared to that of other asteroids, for which spacecraft images or radar reconstructions are available.
	meteoritics.org /Abst_39-3.htm (2310 words)

	A sea otter-shaped rubble pile in space
		Asteroid Itokawa, named after Japanese rocket scientist Hideo Itokawa, was chosen as Hayabusa's "prey" in part because it is one of the most common types of rocky near-Earth asteroids, the so-called "S-type" asteroids.
		In a special issue of journal devoted to the Hayabusa mission, Fujiwara and his colleagues report that asteroid Itokawa has two parts, a smaller "head" and larger "body," giving it the shape of a sea otter, and appears to consist of rubble.
		Fujiwara and his colleagues report that, unlike previously explored asteroids, Itokawa's surface has patches of both rough, boulder-strewn terrain and "seas" of uniformly sized, finer gravel particles, which appear velvety-smooth in the photographs from the mission.
	www.eurekalert.org /pub_releases/2006-06/aaft-aso052506.php (1020 words)

	[No title]
		Very close approaches of 4179 Toutatis, 25143 Itokawa, and 6239 Minos are the highlights of the year.
		Planet 25143 Itokawa will approach Earth within 0.013 AU on June 26, more than a months before the maximum elongation date on July 31.
		Southern hemisphere observers are strongly favored for this brightest apparition of the 21st century as Itokawa will be south of -32 degrees declination for the entire interval it is brighter than magnitude 15.
	www.lpl.arizona.edu /~rhill/alpo/minplan/BRIGHT04.TXT (772 words)

	Institute of Space and Astronautical Science \| JAXA
		This release summarizes and reports the major scientific and engineering achievements in advance of Hayabusa's unprecedented and historic descent to the surface of Itokawa for sample collection middle to later this month.
		Specifically, at the time of arrival at Itokawa, Hayabusa had driven its proprietary new ion engines for 26,000 hours, including their operation during an Earth flyby.
		(A) Morphological and geological discoveries about Itokawa: The a priori theoretical assumption that small near-Earth asteroids should have geologically homogeneous features was completely overturned by the observation of a wide variety of surface features and types at Itokawa.
	www.isas.jaxa.jp /e/snews/2005/1102.shtml (1307 words)

	Could Earth Be Hit By An Asteroid This Week? NASA - "This object has the possibilty of impacting the Earth."
		Coincidentally, I have found that on June 27 and June 29 the Earth is also subject to an extremely close approach by two little known asteroids.
		Information is sparse on Itokawa, but what is known is that the asteroid is approximately 0.36 kilometers wide and on June 27 it will come within 0.0128968 Astronomical Units of Earth.
		Whether or not Itokawa and 2004 MC do pose a threat to Earth I cannot say.
	www.rense.com /general54/arth.htm (525 words)

	Dynamical origin of the asteroid (25143) Itokawa: the target of the sample-return Hayabusa space mission (Site not responding. Last check: 2007-10-09)
		We have studied numerically the origin and dynamical evolution of the asteroid (25143) Itokawa on which a Japanese space probe landed and may have collected a sample.
		To estimate the most probable source of Itokawa, we have used the most recent model of the Near-Earth Object population, which allows us to relate the orbital parameters of a NEO to the different identified source regions of the NEO population.
		Here, we show that its evolution is consistent with the typical evolution of asteroids coming from the identified source and which are extracted in the Earth-crossing zone by planetary encounters.
	www.edpsciences.org /10.1051/0004-6361:20054319 (336 words)

	Asteroid "Itokawa", Target of "HAYABUSA", Comes in Sight
		The distance between Itokawa and earth was about 0.77AU (about 115 million km, 1AU is about 150 million km).
		The distance between Itokawa and the Sun was about 1.52AU (228 million km).
		Itokawa will gradually close to earth and, on June 26, 2004, it will be closest to earth with distance of 0.013AU (about 1.95 million km).
	www.spacedaily.com /news/japan-muses-c-04b.html (369 words)

	Institute of Space and Astronautical Science \| JAXA
		As of September 4th morning of 2005, Hayabusa is at approximately 1,000 km toward Earth with respect to Itokawa, a near Earth asteroid target of the spacecraft, with the approach speed of 10 km per hour.
		Hayabusa took a series of its Optical Navigation Camera aboard on the day and the photos revealed, for the first time in space, the shape information of Itokawa.
		Left one was taken when the brightness was at the top, while the right one was at the bottom.
	www.isas.ac.jp /e/snews/2005/0905.shtml (280 words)

	[FPSPACE] FW: [JAXA:0041] Hayabusa arrives at Itokawa, starts hovering operations
		Hayabusa performed a short chemical thruster burn to slow its >asteroid-relative speed by 7 centimeters per second to settle into the >Gate Position, defined at a distance of 20 kilometers from Itokawa >towards the Earth.
		Hayabusa is now hovering with respect to Itokawa >and the project has made a great step toward its scientific >observations of the asteroid.
		In May 2004, the spacecraft >performed an Earth gravity assist while using ion engine propulsion, >this was the first time a spacecraft has flown such a powered flyby.
	www.friends-partners.org /pipermail/fpspace/2005-September/017838.html (444 words)

	Tman In Tennessee: NEO Updates: Japan Pitches In, Spaceguard 75% Complete, Apophis Makes the News......
		Itokawa, a 600 meter sized, potato-shaped asteroid, is named after Hideo Itokawa, a Japanese rocket pioneer.
		Although the primary objectives of the Hayabusa mission are to test new technologies, the mission will also provide a wealth of scientific returns.
		After closely observing the asteroid for several weeks, a few pellets will be fired from the spacecraft at close range into the asteroid's surface and about a gram of the pellet's impact ejecta will be collected into a sample capsule.
	tmancensored.blogspot.com /2005/08/neo-updates-japan-pitches-in.html (1241 words)

	Japanese probe snatches first asteroid sample - Wikinews
		No other mission has attempted to bring back material from an asteriod which is believed to be a remnant from the formation of the solar system.
		The actual success of the mission to the Itokawa asteroid cannot actually be known until 2007 when the probe returns to Earth.
		Only at that time can it be established if firing a metal pellet into the surface of the asteroid disturbed it enough to allow a sample to be obtained.
	en.wikinews.org /wiki/Japanese_probe_snatches_first_asteroid_sample (295 words)

	In Wake Of Stardust Comet Flyby, Hayabusa Aims For Asteroid Sample Return
		Launched May 8, 2003 from the Uchinoura Launch Center at Kagoshima on Kyushu Island, Japan's Hayabusa spacecraft is on its way to intercept and collect samples from asteroid 25143 Itokawa.
		In honor of the father of Japanese rocketry, it is now known as (25143) Itokawa.
		Scientists hope retrieving samples of Itokawa will increase knowledge and understanding of asteroid surfaces, directly improving our knowledge of the connections between asteroids and meteorites, and helping to shape our understanding of solar system formation in the asteroid regions.
	www.spacedaily.com /news/japan-muses-c-04a.html (1462 words)

	asteroid 25143 itokawa - Above Top Secret Conspiracy Community
		The differences between Toutatis and Itokawa is that Toutatis is almost twice the size of Itokawa.
		Itokawa on the other hand will be at its closest with two other NEO sumultaneously.
		This could be a reason why the ships are out at sea, I don't really know for sure, but the link is interesting in regards to the Itokawa scenario.
	www.abovetopsecret.com /forum/thread59223/pg1 (1438 words)

	The Daily Star Web Edition Vol. 5 Num 532 (Site not responding. Last check: 2007-10-09)
		On Sunday, JAXA officials had said the Hayabusa probe, on a mission to land on the asteroid named Itokawa, collect material, then bring it back to Earth, failed to touch down after maneuvering within yards of the surface.
		However, the agency said Wednesday that data confirmed that Hayabusa had landed on the surface Sunday for a half-hour, although it failed to collect material.
		The 548-metre long asteroid, '25143 Itokawa', is seen nearly 186 million miles from earth in this handout picture taken November 20, 2005 by the Japanese unmanned Hayabusa probe.
	www.thedailystar.net /2005/11/25/d51125012219.htm (225 words)

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