[X] My Assistant

[jamescanvin]

Well that was unexpected. Yestersols drive looks like it was WSW (i.e more west than south) about 85m according to the PDT site.

Can't wait to see the images to confirm this. I assumed the next drive would be due south. Where are we off to now...

[Tesheiner]

You beat me by 10 minutes, James.
Those 85m might change (increase) a little when we get data from yestersol (1786) with the actual driving path. Definitely nothing close to the 160m stated on the monthly report.

[Tesheiner]

Now I'm a bit concerned.

1. Here are the positions pre and post-drive, mapped on a HiRISE image at 25cm which I usually use to double-check the rover's mobility data with the navcam mosaics in polar projection. And the current position seems to be in an area with a few ripples bigger then usual.


2. If I did my math correctly, the rover's attitude after this move is: yaw=-118º, pitch=10º, roll=-6º. Mike (Howard), could you double-check this with MMB?

Long drive aborted after excessive slip?
Can't wait to see the pictures too!

[jamescanvin]

My program for decoding the quaternions is at home, dam it, just when I need to dust it off.

The change in 'z' is also a little worrying; 3.5m is quite a lot for a 85m drive. A similar false reading was seen at Purgatory.

Not that I'm trying to worry anyone.

[mhoward]

It looks odd in MMB, seems to match the numbers you give. We've seen odd before though (and in normal situations); I'm going to hold off on freaking out until the pictures come in.

[djellison]

One mars bar says a Jammerbugt like event. Partial dune ingress - drive self aborted - back out within a day or three

http://www.nasa.gov/mission_pages/mer/imag...er20060720.html

Tesh's map does stop on a large DLO running perpendicular to direction of travel.

(dune like object - geologists seem a bit prickly over what is and isn't a dune)

Doug

[mhoward]

My mars bar says a confused drive terminating in a less-severe DLO collision...

[Tesheiner]

> The change in 'z' is also a little worrying; 5.5m is quite a lot for a 85m drive. A similar false reading was seen at Purgatory.

I got 3.6m (-2.6 to -6.2) instead. In any case, and regardless of the exact value, IMO it might be a consequence of slipping on a tilted position while driving in "blind" mode. Assuming the 10º pitch figure is correct it means slip-driving about 20m at such tilt to "climb" 3.6m.

[jamescanvin]

Yes - that was a mistake (Monday!) I must have been correcting the value when you replied. 3.5 is not so worrying but still maybe a little high.

That is exactly the mechanism that caused the Z error at Purgatory - driving while the rover is at a significant pitch.

[mhoward]

Here's the view from MMB, FWIW. Disclaimer: obviously the data does not match reality, unless Oppy can fly.

Attached thumbnail(s)

 

[Juramike]

Based on Eduardo's Sol1786 position, here is an image showing the Sol 1786 position, centered inside a 50 m black box, on two of the terrain models. There is some potential ickiness around there.



(And of course the excitement happens right at the artifact gap of my model)

-Mike

[Phil Stooke]

As for 'why west?' - they have to go some distance west to bypass the field of purgatoids down near "Porcupine"... I think...

Phil

[Juramike]

Current position/track compared to earlier proposed W Spur Route:


Sol 1786 position is about 75 m E of previously proposed corridor.

-Mike

[Tesheiner]

False alarm, I would say.

[Juramike]

Um, is this, like, wierd??