Talk:25143 Itokawa

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Article[edit]

How about writing the distance from earth to this asteriod ? Martin A


Well, the distance must vary dramatically as Earth and Itokawa progress around their orbits, but if anyone is able to figure out the asteroid's closest approach to Earth, that would be helpful. The Singing Badger 16:26, 13 September 2005 (UTC)[reply]

You could give the distance at a particular time, for example now when the Hayabusa probe is at the asteroid. The point is to give a feel of how far the probe has travelled to get there. Martin A


  • Maybe a word should be added that with 433 Eros, Itokawa is bound to become the best-known asteroid and the second on which a man made object will land and the second object sampled beyond Moon???Hektor 20:36, 15 September 2005 (UTC)[reply]

JAXA Image[edit]

Badger, you & I've talked about using JAXA images before, but Wikipedia's policies are in flux, so let's see how an image fares now. I liked this photo in particular because it really shows the boulders well.

Everyone else, JAXA releases its images for educational and non-profit use, as long as JAXA is credited, and as long as any people in the photos give their consent. I've linked to the JAXA copyright page from the image page.

Here's a version in English [1]. Doesn't say quite the same thing as the Japanese version, but pretty close. kwami 07:50, 19 November 2005 (UTC)[reply]

I tried putting the image in the table, under the name, but it doesn't look as though the table template is set up for that. kwami 07:35, 19 November 2005 (UTC)[reply]

The current version has a picture of the old radar model. Because we have high-resolution optical images of the object, that is redundant and mis-leading. We've been trying to track down the problems with the modeling process, but there is a better radar model from 2004 as well as the 2005-2006 Hayabusa pictures. Someone please put in an image from JAXA. Michaelbusch 14:58, 27 December 2006 (UTC)[reply]

It would be deleted if it was. JAXA's image policy isn't tolerated here, as it's educational and non-profit use only, like Wikipedia. Rather ironic, in my opinion--Planetary 20:39, 27 December 2006 (UTC)[reply]
There are press-release images available (check Google Images for example). But you are correct: JAXA has strange image policies. Michaelbusch 23:10, 27 December 2006 (UTC)[reply]
Actually not that strange. ESA's policy is similar.--Planetary 23:19, 27 December 2006 (UTC)[reply]
If the only existing images of this asteroid are under a restrictive licence, wouldn't this be a prime candidate for fair use? It's not like anyone else can go out and take their own photos of this. Bryan Derksen 22:14, 12 May 2007 (UTC)[reply]
Good idea, especially with the recent release of image data on the JAXA site, which is an obvious statement of permission to use and spread.--Planetary 04:34, 13 May 2007 (UTC)[reply]

Why?[edit]

There's no mention of why, of all asteroids, this asteroid was chosen for a sampling mission. Morganfitzp (talk) 23:15, 14 June 2010 (UTC)[reply]

The selection process was shown in a talk at COSPAR meeting in Bremen.
a) The launch vehicle is relative small and the delta-v is limited.
b) The space craft is small and has only little fuel on board.
c) The return capsule has a speed limit for re-entry.
Take a list of all asteroids of the solar system you know.
Delete all which are not close or little off from the ecliptic. because of a) they are out of reach
Delete all big ones. you can't go into orbit around a irregular body because of b)
Delete all the ones which would give you a too fast re-entry speed
Delete all fast rotating ones because they will kick you if you do something wrong
You will end up with 10 maybe 15 objects which you than sort by C, M .... or other types and than you pick the type which nobody up to that point visited. You end up with one and only one asteroid.
The same process made it possible that two groups of scientists chose (162173) 1999 JU3 for their next mission, not because this one is the best one, but the only one they can reach with their budget. --Stone (talk) 22:55, 18 November 2010 (UTC)[reply]

Color pictures?[edit]

With as cheap and lightweight as full color digital cameras are, why are the space agencies still sending out probes that only have monochrome cameras? Even when this probe was launched a fairly decent color digital camera was available for around $200 and only weighed a few ounces. That's a bare bones camera module, not the sort people use to take their vacation snaps. They need to shop more at places like "Spy Gear R Us" instead of putting out every part for bids and getting stuck with ludicrously overpriced, outdated technology. Bizzybody (talk) 05:44, 15 June 2010 (UTC)[reply]

Merging[edit]

Hello editors. This article seems to be small enough to hold this in it too. At the moment, I dont see any reason for it being separated. If no one disagrees in a merge, I will carry out the merge soon. Kind regards. Rehman(+) 03:43, 18 June 2010 (UTC)[reply]

 Done. The list-page seems to be an orphan, thus I don't see why a merge wouldn't help. Rehman(+) 04:12, 18 June 2010 (UTC)[reply]

orthography[edit]

Why is the Japanese name shown in katakana rather than as 糸川? —Tamfang (talk) 19:04, 26 September 2010 (UTC)[reply]

data on the table[edit]

Would it be a problem to change

  • Equatorial surface gravity ~0.0001 m/s²
  • Escape velocity ~0.0002 km/s

to more easy to read values such as

  • Equatorial surface gravity ~0.1 mm/s²
  • Escape velocity ~0.2 m/s

? RubenGarciaHernandez (talk) 21:24, 17 November 2010 (UTC)[reply]

Makes sense to me. —Tamfang (talk) 19:19, 9 December 2010 (UTC)[reply]

Albedo[edit]

Here the albedo is said to be 0.23. Even this is at the upper edge of the range for S-type asteroids (0.11 to 0.22). But 0.53 is a way too big. I must be a mistake. Oleksiy.golubov (talk) 01:06, 9 June 2014 (UTC)[reply]

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External links modified (January 2018)[edit]

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Expert needed[edit]

First sample returned... meriting a Hayabusa 2 (plus OSIRIS-REx)... and WATER... and this is it? Without the tables and graphics the article is ~3x stub length. Anyone who works with meteoriticists can tell you how deep they can go into minutiae... maybe too deep. 96.86.6.181 (talk) 22:00, 19 January 2019 (UTC)[reply]

A specific issue needs to be addressed concisely. 25143 Itokawa is a start level article. Rfassbind – talk 11:24, 25 February 2019 (UTC)[reply]

Non-free image[edit]

The lead image, File:Hayabausa Image of the asteroid Itokawa.jpg, is tagged as non-free. On this page, the image credit is given to NASA/JPL. So that would be free, wouldn't it? Rfassbind – talk 16:23, 25 February 2019 (UTC)[reply]

Sallest asteroid visited by a spacecraft.[edit]

"Itokawa is the smallest asteroid ever photographed and visited by a spacecraft."

This may be outdated since December 3, 2018 when OSIRIS-REx arrived at 101955 Bennu. Bennu has a mean radius approx. 50m less than Itokawa.

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