Mission: Hayabusa 2 |
Mission: Hayabusa 2 |
Jan 22 2008, 02:59 PM
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#1
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Junior Member Group: Members Posts: 58 Joined: 17-September 06 Member No.: 1150 |
JAXA wants to continue with Hayabusa 2. However there is/was a huge fight about the budget. Main problem was the budget for the launch vehicle. 2 months ago or so there was a report which said, that JAXA had to find another launch vehicle or the project gets cancelled. Now the Italian space agency played saviour and overed the VEGA. So finally we might see another Hayabusa in 2011.
It was mentioned here: http://www.jspec.jaxa.jp/080110Final_IPEWG-ProgramBook.pdf |
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Jan 3 2013, 09:37 PM
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#2
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
From "Small carry-on impactor of Hayabusa2 mission"
A schematic of the shaped charge penetrator, a model, and a test impact. More pictures at the link. EDIT: The model pictured above is captioned: "Small model of the explosive part. Weight of the explosive is about 150 g." The schematic below is captioned: "Shape of explosive part. It has a liner face in the shape of a shallow dish. The weight of the explosive is about 4.5 kg." So it seems the actual impactor will have 30 times the explosive as the model. |
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Jan 4 2013, 07:48 AM
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#3
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Quote removed - Mod
This, actually is far better than the pictures and schematics carried in the document I was using. For instance, All I could find as the liner shape was a simple vertical line because only a cross section schematic was there in the document I was translating. Here, you can see a lot more. Anyway, I have been yapping about this mid spce explosion for a long time, thinking that such an explosion cannot possibly send the colliding mass in the right and accurate direction. I am now a lot happier. In case anybody is interested I am pasting the remaining pages of translation as follows. P P-7 Page title: Collision operation Outline: 1.Mothership descends to the asteroid with the collision device pointing to the asteroid 2.Seperation at an altitude of approx. 500m 3.Horizontal evacuation maneuver 4.DCAM seperation 5.Vertical evacuation maneuver 6.Detonation. Timing is by a pre-set timer. Timer is activated on detecting seperation. P-8 Page title: Evacuation time Time between seperation and detonation: If too short then delta V required for evacuation will get larger. If too long the error in colliding position will get larger, making the collision point area lager and/or fall to the asteroid before detonation (I remember there was a couple of pictures here, P) P-9 Page title: Evacuation maneuver and collision accuracy Time from seperation to detonation: 2400 seconds, collision point accuracy (radius) of approx. 200m, evacuation delta V is approx. 10m/s P-10 Page title: Explosive section: Shape: conical Liner: Copper without oxygeon Explosive charge: HMX type PBX Mass: Approx. 9kg (explosive charge alone is 4.5kg) P-11 Page title: Liner flight Liner shape: Shell type. Deformation time: < 0.5ms Relative collision velocity: > 2000m/s. Mass: > 2kg. P-12 Liner into sand experiment P-13 1/2 scale model tests P-14 1/2 scale model flight tests (continued) P-15 1/2 scale model flight tests (continued) P-16 Page title: Long flight tests Test flight distance of approx. 100m P-17 Page title: Long flight tests (continuation) Collision body : 1/1 scale model was used and it was confirmed that its intended flight shape was successfully formed by explosion P-18 Page title: Long flight tests (continuation) Deviation from designed flight path of less than 1 degree confirmed, velocity also confirmed P-19 Page title: Long flight tests (continuation) Observation of ejecta was carried out P-20 Page title: Summary Designed results confirmed and further improvements will be made. |
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Jan 28 2013, 08:21 AM
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#4
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Below is just for your information.
March edition of Scientific American (Japanese version) apparently gives the names of those involved in Hayabusa 2 as follows. Project manager is Prof Hitoshi Kuninaka of JAXA (ISAS). Project scientist is Prof Seiichiro Watanabe of Nagoya University. His main interest is planet formation. Mission manager is Prof Makoto Yoshikawa of JAXA (ISAS and National Astronomical Observatory) P |
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Jan 29 2013, 11:41 AM
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#5
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
On my way back from a gym session I walked into a library and amazingly found the March edition of this Scientific American!
There was a short article in it with some photos. Photos apart, what caught my eyes were: 1. There will be a small camera to televise the moment of crater creation. 2. There will be 4 reaction wheels (instead of 3 on Hayabusa), all supposedly trouble free because JAXA now know what went wrong with Hayabusa reaction wheels. 3. Improved (on Akatsuki's) chemical engines. 4. More powerful (+ 20%) ion engines. P |
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Jan 29 2013, 12:27 PM
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#6
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Forum Contributor Group: Members Posts: 1374 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Is the reason for the reaction wheels failure available to the public ?
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Jan 30 2013, 08:31 AM
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#7
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Is the reason for the reaction wheels failure available to the public ? I have no idea and the article did not mention the reason. If there are JAXA reports on this issue I am sure there are reasons given there, but finding those reports is a big problem, I think. By the way, Hayabusa 2 will definitely go in 2014 as the funding has been secured. There have been many newspaper reports on this. P |
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