Hayabusa2 MINERVA-II-1 operation, 20-21 September 2018 |
Hayabusa2 MINERVA-II-1 operation, 20-21 September 2018 |
Sep 20 2018, 11:13 AM
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Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Hayabusa 2 has started its descent towards Ryugu for Minerva deployment. Real time navigation images are posted here. One new image every half hour or so.
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Guest_mcmcmc_* |
Sep 24 2018, 07:44 AM
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#2
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Guests |
Outstanding! I have one thing about which I am curious. The final of the three images states it was taken while its rover was in mid-hop. I'm wondering why any hopping activity was occurring without any commands sent from Earth -- I didn't see any indication of pre-programmed hopping set up in the deployment and landing timelines I don't remember which one, but one rover has an "automatic temperature-triggered hopping engine": every time it passes from light to shadow and viceversa, the mechanism is triggered and the rover bounces. For ever, as it does not use any fuel but the sun. It is one out of 4 or 5 different hopping mechanisms being tested. |
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Guest_mcmcmc_* |
Sep 24 2018, 07:58 AM
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#3
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Guests |
I don't remember which one Looks like it's the "next one": QUOTE Yamagata University was in charge of one of the moving mechanisms installed in MINERVA-II-2. We devised and developed an "environmentally driven" moving mechanism using bimetal as an actuator, utilizing large temperature difference caused by the presence or absence of sunshine. Bimetal is a laminate of two types of alloy thin plates with different expansion coefficients, and it is a buckling type (mainly developed by Mineki Laboratory) that tends to bend due to temperature change and momentarily warps to the opposite side when exceeding the limit point , And a magnetic latch type which momentarily warps off the magnet (mainly developed by Tsumiki Laboratory). Even if the ambient temperature varies depending on the MINERUVA - II - 2 's dropping position and surrounding conditions, the possibility of either of which can be coped with is raised by setting the operating temperature to be shifted to the high temperature area and the low temperature area respectively. The rotation period of this asteroid is about 8 hours, and hopping in random directions every 4 hours corresponding to morning and evening. http://mineta-lab.yz.yamagata-u.ac.jp/HAYABUSA2.html |
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