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Dust Storm
xflare
post Dec 13 2018, 02:50 PM
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QUOTE (marsophile @ Dec 13 2018, 07:31 AM) *


That article says pretty much the same as the one from the Planetary Society, however this tweet from systems engineer that came a few days later is less optimistic now sad.gif

https://twitter.com/AstroStaab/status/1072216372849954816
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RoverDriver
post Dec 14 2018, 01:14 AM
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My take is that the likelyhood of Oppy waking up increases as time goes by until end of January 2019 then it drops quite rapidly. The idea being that between Ls 290 and Ls 310 we have seen cleaning events. As it stands Oppy likely needs more than one cleaning event to regain consciousness. Once the windy season is over Winter will get the vehicle too cold to survive. This is *my* take, not an official position of my employer, yadda yadda yadda.

Paolo


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James Sorenson
post Dec 14 2018, 03:10 AM
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I have a question for you Paolo. I am trying to get an idea of what the final physical state of what the rover was left in. The last hazcam's show that the arm was placed on a target with the APXS in contact and I vaguely recall reading in a planetary society update that it was a team's decision to leave the arm placed on that target during storm prep. I have not been able to locate that again. Was this the case? What was the final position that the camera mast in? I assume it was placed so the cameras were pointed down in such a dust storm situation. I just find it fascinating to know because the final known pose position for any surface mission would be how they would look for millions or even billions of years. It is how they will look like when astronaut's walk up to them. smile.gif
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RoverDriver
post Dec 14 2018, 06:55 AM
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Yes, the APXS is down on the target. We didn't have any power to do anything except take the last tau measurement. The PMA is always "stowed" before a shutdown, that is the elevation is at least 17 deg below the horizon. We do not point the PMA straight down in case the elevation actuator stops working you can at least see a bit of terrain in front of the rover while having the cameras pointed down-ish.

Paolo


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James Sorenson
post Dec 18 2018, 05:24 AM
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Thank you for confirming that for me, Paolo.
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marsophile
post Dec 31 2018, 01:59 AM
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Assuming a clock fault has occurred on Opportunity, what happens to the clock once power is restored? Does it reset to a random time and continue from there? Or does it remain unusable until a reset is commanded from Earth?
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mcaplinger
post Dec 31 2018, 03:07 AM
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QUOTE (marsophile @ Dec 30 2018, 05:59 PM) *
Assuming a clock fault has occurred on Opportunity, what happens to the clock once power is restored? Does it reset to a random time and continue from there?

https://www-robotics.jpl.nasa.gov/publicati...Drift_final.pdf -- I expect that the Mission Clock would reset to zero if the power dropped below the maintenance level, but I'm not sure. It really doesn't matter for recovery as there are other sol-based timers that will be used. If they recover, resetting the clock should be simple.


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marsophile
post Jan 6 2019, 06:50 PM
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As we know, there have been many spurious DSN locks on Opportunity. I assume however that a DSN lock can only occur at a time when an antenna is scheduled for downlink on a mission, i.e., the antenna is actively listening.

Thus, I am puzzled by this, no doubt spurious, lock
https://twitter.com/dsn_status/status/1081774112303919105
which, if I am not mistaken, occurred around 5am local solar time at the Opportunity site. Why would a listening window be scheduled for a time that seems clearly before any "solar groovy" time? A scheduling artifact?
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mcaplinger
post Jan 6 2019, 07:55 PM
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QUOTE (marsophile @ Jan 6 2019, 10:50 AM) *
if I am not mistaken, occurred around 5am local solar time at the Opportunity site

Tweet is dated 8:47 PM 1/5/2019, which I assume is PST. That's 04:47 UT on 2019-006 which according to MarsJ24 is 11:12 LMST at Opportunity.


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serpens
post Jan 7 2019, 12:59 AM
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Nice and sunny albeit with a dusty haze. So was it a carrier lock on Opportunity?
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marsophile
post Jan 7 2019, 03:45 AM
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QUOTE (serpens @ Jan 6 2019, 04:59 PM) *
Nice and sunny albeit with a dusty haze. So was it a carrier lock on Opportunity?

Most likely a lock on Maven, which was active shortly afterwards at a similar frequency and power level (when it uses LGA)
https://twitter.com/dsn_status/status/1081790404515766272

I had thought the Oppy time specified at the Mars Rover site
https://mars.nasa.gov/mer/home/
matched that at the Lemmon site
http://www.lpl.arizona.edu/~lemmon/mars/MERClocks/merb.html
but they seem to have fallen out of synch.
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Deimos
post Jan 7 2019, 02:13 PM
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Not sure what's up with the JPL clock. The other one is out of date by several leap seconds (and a sol 1k issue). The tau site has a more up to date clock.
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