Opportunity in a sandtrap, again, A thread for the topic Options

[akuo]

Oppy looks like to be stuck in a dune once more!

The front wheels (rover was moving backwards into the dune) look to be closer to solid surface than during the purgatory incident, so hopefully they can back out pretty quickly.

I know this is already being discussed in the other thread, but I think this way the incident is clearer to a casual reader of the forum. Threads of nearly 1000 posts clog the discussion anyway.

http://qt.exploratorium.edu/mars/opportuni...GBP1151R0M1.JPG

http://qt.exploratorium.edu/mars/opportuni...GBP1311R0M1.JPG

inline images changed to links. 2048 x 1024 of images clogs discussions as well - Doug

[djellison]

A whole lot of doom and gloom when we don't know how stuck it is, how much driving took place.

Remember the mini-purgatory back toward the NE rim of Erebus. They were out of it a sol later, Give it 2 sols....THEN maybe there's grounds to be slightly nervous, but even then, we got out of Purgatory, this will be a breeze.

Doug

[jamescanvin]

I agree Doug it's not anywhere near as bad a Purgatory, I think we'll get out fine.

I do think it's much worse than the other event that we got out of straight away though.

---

Was this the other event?

http://qt.exploratorium.edu/mars/opportuni...FSP1235R0M1.JPG

http://qt.exploratorium.edu/mars/opportuni...FSP1335L0M1.JPG

[jamescanvin]

Assuming it was (Edit: it was, thanks Tesh) - the tracking site says there was about 5m of driving to get into that (and the rover made 1-2m) in this case we apparently have 24m of driving. Still, a lot less than at Purgatory (50m+ iirc)

[akuo]

The rear wheels don't seem to be as deep in the muck as they were during Purgatory.

[Ant103]

Okay Akuo. This significate that it's not desperate?
There is an other thing : the rock layer seems to be less deeper than the first time Oppy was "jailed" by sand. Is the wheel can touch this layer and the rover roll onto?

[climber]

I must admit that the situation is not clear to me. If you look the tracks, you can see that we moved backward at first then came back to the outcrop and finaly moved backward again... and there is NO sand in the direction we're driving so, we're FREE, aren't we?

[akuo]

If you look the tracks, you can see that we moved backward at first then came back to the outcrop and finaly moved backward again... and there is NO sand in the direction we're driving so, we're FREE, aren't we?

I don't think so. Looks like Oppy is plain backwards driving mode for this, and they just zigzagged around that flat piece of outcrop. Oppy executed a turn a few metres back from the place she is now. Then it was straight (backwards driving) into the dune and stopping there for whatever reason - either because of the end of the commanded drive or the slip protection stopping her.

[Guest_Myran_*]

Indeed jamescanvin, it was supposedly 24 m of driving, question are if the slippage detection did cut in or not.
Even though im usually pessimistic about most things, this time im not, to me its looks less severe than Purgatory and more similar to that 'slightly stuck' situation we had some time after that. In short, I view this as one small unforseen delay on the trek towards Victoria and nothing more.

[Vladimorka]

This is what happens when JPLers don't follow Tesh's route :-)

Rover drivers, take your lesson and stick to the blue line :-)))

[djellison]

where's the 24m figure coming from?

Doug

[Guest_PhilCo126_*]

Hopefully no Purgatory-Dune scenario !
It took the JPL-team about 5 weeks to get the MER out of its dug-in position ( Oppy was stuck from sol 446 to sol 484 ) ... fingers crossed

[ustrax]

Hopefully no Purgatory-Dune scenario !
It took the JPL-team about 5 weeks to get the MER out of its dug-in position ( Oppy was stuck from sol 446 to sol 484 ) ... fingers crossed

Humm...It looks like everyone is arriving to watch the accident...

I've got hope on seing Oppy out of there in less than a week...Let's vote?...
Just kidding Doug...

[jamescanvin]

where's the 24m figure coming from?

That's the distance from the tracking database.

Example:

..sol/832..::71::233::10.5673::-65.9588::-0.0208675
..sol/833..::71::327::12.1891::-89.7695::-2.32683

Last three numbers (I think) are: distance east, distance north & distance 'down' from 7100 in merters. As has been discussed at length in the route map thread these usually tally pretty well with Tesh's route map.

It's also very unusual to see such a large z displacement - I guess what has happened here is the rover knows it was pitched down for the whole drive and so after 24m forward it should have gone down ~2m.

I'll dig up these numbers for Purgatory and Near Purgatory, stand by.

James

[djellison]

Ahh - it may well be that 24m was the expected drive distance, but some in-drive visidom killed it. Those figures sound like the expected position based on predrive imaging.

Doug