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Substantial Revision[edit]

As you can tell, I substantially revised this page with new content. I wrote about the delay in rendezvous from June to September, eliminated the part about "phase I" and "phase II" since it's likely that the mapping schedule has been revised due to the delay, and talked about the Minerva lander. --Centurion328 19:51, 10 Jun 2005 (UTC)

Meaning of 'Hayabusa'[edit]

Anyone knows the original meaning of term "Hayabusa".. From Japanece history as I guess.. The preceding unsigned comment was added by (talk • contribs) .

  • I don't speak Japanese, but in Chinese translation, it's "??" (a kind of bird). The preceding unsigned comment was added by Yaohua2000 (talk • contribs) .

To answer the earlier question, hayabusa means peregrine falcon in Japanese. --Moki80 21:13, 12 Jun 2005 (UTC)

Hayabusa is the worlds fastest flying bird. That is why Suzuki named its flagship motorcycle GSX1300R a Hayabusa. The preceding unsigned comment was added by (talk • contribs) .


"Hayabusa is the first spacecraft designed to deliberately land on an asteroid and then take off again." - I wouldn't call it landing, the main spacecraft doesn't touch the surface of the asteroid (if all goes well). --Bricktop 00:50, 5 October 2005 (UTC)

I think, you are judging too hard. Does an airplane not land, because it only touches the ground with its wheels? More interesting would be the maneuver executed by Hayabusa: Does it fire its engines to leave the asteroid or not? Awolf002 00:57, 5 October 2005 (UTC)
Does a helicopter land only because its tethered payload touches the surface? I think this is a much better comparison for Hayabusa's landing. The spacecraft for itself isn't designed to survive a landing, to stay some time on the surface and then take off (like for example Luna 16 sample return mission). In my eyes Hayabusa performs a sort of landing, but I wouldn't specially point out "the first landing and takeoff" --Bricktop 01:11, 5 October 2005 (UTC)
Well, all this is moot given that Hayabusa is going to release an undeniable landing craft, the little Minerva probe. Maybe the article just needs rewording to reflect that?The Singing Badger 13:02, 5 October 2005 (UTC)
Yes Minerva lands indeed, but it doesn't take off any more (ok it jumps around :-), but it can not leave the gravitational pull of the asteroid any more). --Bricktop 14:02, 5 October 2005 (UTC)
I tried rewriting in light of this ... see what you think. The Singing Badger 15:14, 5 October 2005 (UTC)
Ok much better, technically correct and NPOV. Thanks! --Bricktop 16:44, 5 October 2005 (UTC)


At IAF in Fukuoka last week Hayabusa was announced to be 3 km from Hayabusa and new close up views were presented. Minerva will be dropped from an altitude of 30 meters. Hektor 23:35, 23 October 2005 (UTC)

Did they also say something on the LUNAR-A launch date? --Bricktop 14:24, 24 October 2005 (UTC)
No news about LUNAR-A. Indeed, they announced that the first flight of H-IIA 204 for next year and of H-IIB in 2008. High debate it seems in Japan to see whether or not the first HTV should fly on the first H-IIB.Hektor 16:48, 25 October 2005 (UTC)
Thanks! Another question: what about SELENE, will it fly 2006 like previously sheduled? I don't hear any news about it. --Bricktop 17:45, 25 October 2005 (UTC)
No news about SELENE either. The sequence of launch of H-IIA seems to be ALOS, then MTSat-2 and then the spy satellites and then ETS-8. So maybe in 2007 ? But just a guess on my side. SELENE is the fifth H-IIA in line it seems.Hektor 08:45, 27 October 2005 (UTC)

Is the mission a complete failure due to the problems with MINERVA? Or will Hayabusa still be able to land on the surface of this asteroid... Alex 04:18, 13 November 2005 (UTC)

The loss of MINERVA has no effect on the landing. The Singing Badger 05:05, 13 November 2005 (UTC)

NASA text appears twice[edit]

The text describing the miniature NASA rover, which was cancelled, appears twice. I can see why it does, as it fits in both sections, but it feels wrong when reading the article. I'd suggest removing it from the section on Minerva mini-lander, and leaving it in the section on Changes in mission plan. 00:01, 12 November 2005 (UTC)

MINERVA Status[edit]

I think this doesn't fit well in article, so I'll write here: Information from Shin'ya Matsuura's blog, which quotes JAXA public relations e-mail:

Project manager Jun-ichiro Kawaguchi's comment:

Q) Did MINERVA land on Itokawa?
A) There's no indication of that.

Q) Is there possibility of orbiting around Itokawa?
A) Since we're not observing cyclic ON/OFF signal change, probability of orbiting is low, unless it is some exceptional case.

Q) Is there possibility of MINERVA to return and fall to the asteroid surface?
A) Theoretically, there's possibility of falling by solar radiation pressure.
Its velocity of escaping Itokawa was 8.3cm/sec at infinity.
In case of MINERVA, it will be decelerated by solar radiation by 1.4cm/s/day, and this works like gravity.
It will stop ascending in 6 or 7 days, and it will go back to the same distance from sun around Itokawa after about same duration. That will be 2 weeks in sum.
If the returned position is close enough to Itokawa, it might collide with its surface. If it passes nearby, it will be swung by Itokawa's gravity, and since it isn't directed toward sun, it will gradually pushed away.
For about two weeks, I expect to monitor with Hayabusa's receiver. At least it will be blown back by solar radiation, so, if it is to be inside Hayabusa's receiving antenna pattern, it will be able to communicate. With that result, and after taking some time to lock on, we can deduce its trajectory.
We will continue to use the receiver to monitor the signal from MINERVA.

Q) Is MINERVA a failure?
A) As an engineering experiment payload, its function as probe robot such as its release, communication, data relay transfer, image acquisition, instrument data transfer are working in the place where it is, so I think I can say it proved the functionality.
As for the scientific observation: Although for short duration, temperture measurement affected by heat radiation was done, which I consider is meaningful.

--Fukumoto 20:01, 13 November 2005 (UTC)

Hayabusa not slated to return to Earth by 2007 due to problems[edit]

Please see the following:

I would edit the article, but do not feel like it at the moment. --Marsbound2024 02:56, 19 December 2005 (UTC)

No sample?[edit]

According to today's AP story, analysis of the data shows that "the probe did not show that it had fired a metal projectile onto the asteroid's surface during landing, as previously believed." Not sure what the source of this statement is, though. Rmhermen 23:10, 7 March 2006 (UTC)

Today's conference confirms this.[1] Rmhermen 14:23, 20 March 2006 (UTC)


"Second, since it was the first-ever soft contact with the surface of an asteroid it has enormous influence on further asteroid missions."

Is this statement from the 'Scientific and engineering importance of the mission' section correct? From what I have read on the NEAR Shoemaker article (the 'Orbits and landing' section), Shoemaker was the first-ever soft contact landing on an asteroid (even though the orbiter wasn't originally designed for landing). 15:32, 17 April 2007 (UTC)

Craft image[edit]

I've updated the "artist's impression" to show the last iteration of images that I drew for ISAS. It's more accurate and detailed than the one it replaces (which I also drew) - and on that topic, I for one would like some more pictorial references for MINERVA. This was a highly innovative micro-lander, and it has very little public-domain information about it.

JGarry 12:13, 6 May 2007 (UTC)J.R.C. Garry

Swirling dust[edit]

The article states that "there is a high probability that some dust swirled into the sampling chamber". Since there is no atmosphere to cause such swirling this probably needs to be reworded. I would change "swirled" to "was deflected" but I don't want to without reading the words used by scientists connected with the mission. Rsduhamel (talk) 19:15, 27 May 2008 (UTC)

I think it was written by me and I admit it was bad choice of the word. The original word used is like "there's possibility that some sample was captured to the sample capsule" with the assumption that during the first sampling attempt the sampler horn hit the asteroid surface with a velocity greater than planned, and the sampler horn is designed to deflect any upward-moving objects to the sample catcher.[2] --Fukumoto (talk) 15:59, 28 May 2008 (UTC)

Manual of Style (Date)[edit]

Editors should take note of Wikipedia:Manual of Style (dates and numbers) and Wikipedia:Manual of Style (dates and numbers)/Date autoformatting. Although I myself will not edit the article for unlinking only. --Fukumoto (talk) 04:58, 8 February 2009 (UTC)

Cite information in English where available[edit]

Nevertheless JAXA publishes English web pages in most occasions, many citation and notes rely on Japanese versions of JAXA web pages. Let's use English articles as much as possible. Hrkoew (talk) 08:48, 27 November 2009 (UTC)

Styling of the name "Hayabusa"[edit]

In the context of this article, "Hayabusa" is a proper noun (the name of the space probe and associated mission) and not simply a foreign word; therefore it need not (and should not) be italicized. See the section on italics in Wikipedia:Manual of Style. The article was very inconsistent on this point and has been tidied up. Piperh (talk) 08:20, 15 March 2010 (UTC)

No, it should be italicized as the name of a ship. Rmhermen (talk) 13:46, 24 February 2011 (UTC)
It looks like italicizing is the general consensus on most spacecraft pages, although there is considerable variation. Does someone feel up to standardizing this?Rppeabody (talk) 19:34, 24 February 2011 (UTC)
Only when it would be correct to do so, for example see the difference between Deep Impact or Mir and International Space Station. Not every name should be Italicised. If you wish to standardise I suggest you discuss it with Wikiproject Spaceflight first. ChiZeroOne (talk) 08:57, 25 February 2011 (UTC)

Surface photos[edit]

The BBC article says that there were amazing surface photos. I can't seen any on the Nasa website ... are there any to be had for this article? -- maxrspct ping me 11:30, 31 May 2010 (UTC)

Because this is not a NASA mission. JAXA's license term seems considered incompatible with Wikipedia requirement, although, 25143 Itokawa page is using one. --Fukumoto (talk) 14:17, 31 May 2010 (UTC)

Main Mission[edit]

There are a number of contradictions with Japanese version of this page. For example, the main mission of this project, as Japan Aerospace Exploration Agency claims, is mechanical testing of the engines. Bringing back samples from Itokawa is not the main mission. -- (talk) 15:47, 13 June 2010 (UTC)

It is true that the article description is poor, but, its mission is the demonstration of the technology of asteroid sample return.[3] Ion engine is a major element, but not sole one. --Fukumoto (talk) 18:17, 13 June 2010 (UTC)
I'd suggest updating the mission objectives, i.e., verifying the implementation of controlled ion engine navigation, asteroid probing, and collecting a sample. Yes, there has been a lot of media coverage on the "sample return" mission. However, JAXA explicitly stated that the space probe was intended to "verify the practicality of acquired technology developed to archive[sic - this might be a typo. achieve?] future full-scale 'sample return missions'."[4] Resources from different engineering sectors have been involved to incorporate more than several backup systems, including the ability to reroute/reconfigure the engine circuitry, for a rainy day in deep space. Hayabusa has certainly proved that many of the implementations involved do work. --Hayarkon (talk) 20:18, 16 June 2010 (UTC)

Re Entry Exposure[edit]

I dont know whether these are of any significance or use to this artical, however I'f uploaded a photograph and crop taken of the re-entry onto Commons. They where taken roughly 200km to the south of the final touch down. —Preceding unsigned comment added by (talk) 07:14, 15 June 2010 (UTC)

I've removed the noise from the 18mm, the resault being a far cleaner image —Preceding unsigned comment added by (talk) 00:50, 9 August 2010


How much did it cost?andycjp (talk) 06:21, 16 June 2010 (UTC)

According to the Mainichi shimbun, the development cost was 12700000000 Yen (127億円). Oda Mari (talk) 08:29, 16 June 2010 (UTC)

no pictures of Itokawa odd for an article on the article for the probe it visited[edit]

its just damned odd. i would add the picture myself but i dont want to f*ck up the article, if no ones added it or replied to this comment in a few days I will attempt to "be bold" and add it myself without mucking up the page :V - CryoKeen —Preceding unsigned comment added by (talk) 09:17, 16 April 2011 (UTC)

The Little Blue Dealie?[edit]

on the lead's image ( there seems to be a little blue...dealie on the left side near the center of the picture. Does anyone know what that is? I couldnt find any corresponding description on the page about it, and since it was made on a computer, i have to assume it was put there intentionally. (talk) 18:40, 28 August 2011 (UTC)

A reasonable guess: Hayabusa#MINERVA_mini-lander. - SummerPhD (talk) 01:30, 29 August 2011 (UTC)

How long did the spacecraft travel?[edit]

I tried to look up but I don't know the keyword ("mileage"?). See Hayabusa Spacecraft Returns With Fiery Show: "The capsule's safe return caps a seven-year, four billion miles (six billion kilometers) space journey that took Hayabusa to a near-Earth asteroid and back." (talk) 07:55, 4 March 2012 (UTC)

"distance"? —Preceding signed comment added by MythSearchertalk 10:43, 4 March 2012 (UTC)

Change Cuusoo website to Wiki page?[edit]

Title says it all. If there's a Wiki page, why not change the link? Lythronaxargestes (talk) 04:00, 17 June 2014 (UTC)

Lagrangian point[edit]

I'm not an expert in either orbital mechanics or the history of the Hayabusa, but wouldn't the "station-keeping heliocentric orbit close by." in fact have been a Lagrangian point? It seems unlikely that JAXA would have wasted energy stationing the craft elsewhere (?) This being the case, 'station-keeping orbit' seems a rather imprecise term. — Preceding unsigned comment added by (talk) 08:01, 21 August 2014 (UTC)

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