Perseverance - Early Drives, Sols 14-72 Options

[Andreas Plesch]

And here I thought that a meter was the length of a platinum bar kept in Napoleon's tomb.

Seriously though, I guess you're not using "meter" to mean a fixed length? There seems to be potential for confusion ...

Yes, it is confusing. I was just following the nomenclature and discussion of section 3.9.2 in https://pds-imaging.jpl.nasa.gov/data/msl/M...CES_PDS_SIS.PDF

See

http://www.unmannedspaceflight.com/index.p...st&p=250931

[PaulH51]

A short drive away from the ejected belly pan, then a turn in place during sol 23

[Tom Tamlyn]

Yes, it is confusing. I was just following the nomenclature and discussion of section 3.9.2 in https://pds-imaging.jpl.nasa.gov/data/msl/M...CES_PDS_SIS.PDF

Ahh.

3.9.2. Projected Meters vs. True Meters
It is important to note that the east/west measurement, called “easting”, is defined by meters at the equator. Orbital images as used by the MSL localization science team, and thus by PLACES, use a rectangular projection, so that lines of longitude are parallel (as are lines of latitude, naturally). For convenience there are an equal number of meters between each line of longitude, regardless of latitude. This greatly simplifies calculations, and as a nice side-effect causes site frames to be parallel in the orbital projection
****
It should be noted that the rover works only with true meters, and does not take into account planet curvature. Thus the “telemetry” view (and only the “telemetry” view) is actually expressed in true meters, and assumes a flat world. The localization error in telemetry, even with visual odometry turned on, is far greater than the true vs. easting meters difference, so in practice this distinction makes no difference.

Hmm. That's helpful, in that I now dimly grok what's going on. I seem to recall from that whimsical novel Flatland that the reaction of the animate geometrical figures to the idea of additional dimensions was irritable disbelief, and my emotional reaction is similar -- when I think about concepts of length, I want to assume a flat world.

Thanks very much!

[Sean]

[kenny]

I wonder of the dust inside that panel, on the right, penetrated the seal during landing blast, or bounced in there during panel jettison, or came from the wheels driving past?

[Dig]

Excellent. How to get the colors?

[John Moore]

Just a simple, experimental look at the impact dynamics of the pan with the surface on the pebbles from a macroscale level, at bottom-right.

As the impact caused three small pebbles to be shifted (well, at least three easily viewable ones amongst others too small to see), I wonder are
the two blue-high-lighted ones, in left view (before impact), those two same ones on the right (after impact).

As to which or where the orange-highlighted pebble originated from is, in the before impact view, anyone's guess.

John

[JRehling]

Fun mystery, John. I think I may see the origin of the orange pebble. In Image 1, there is what seems to be a smaller, bright, triangular pebble above (at the 1 o'clock position of) the leftmost of the two blue pebbles. I think the deployment of the hardware rearranged the soil and unearthed that pebble from a mainly-buried state to a mainly-exposed one.

[John Moore]

Cheers, JRehling...you could be right.

Thomas Appéré's animation above, at a zoomed-in view
of the pan's right-hand corner, shows the pebble 'jumps' nicely. There also is another 'jumping pebble' (yeah, the term might catch on ) examples on the pan's
bottom-left corner area, too.

John

[MahFL]

They opened a cover on the sample receiving part on the rover, does this cover remain permanently open ?

Attached thumbnail(s)

 

[PaulH51]

They opened a cover on the sample receiving part on the rover, does this cover remain permanently open ?

If I'm understanding this document correctly, then it's a 'one-time deployment door'.

The bit carousel (BC) assembly contains an upper and lower opening in its structure. The lower entry point allows for sample tubes to be inserted into bits for sample acquisition, as well as removal from a bit once a sample has been collected (Figure 8). The upper entry point supports bit exchange operations with the Corer assembly. Both of these openings utilize a one-time deployment door to maintain cleanliness of the hardware within the BC until release on the surface of Mars. Both doors consist of a passive spring-actuated hinge mechanism held closed by a latch that is deployed via a release mechanism. The release mechanism is a series of passive spring-actuated mechanisms initiated by a separation nut non-explosive actuator (NEA) device from Ensign-Bickford Aerospace & Defense Company.

[Andreas Plesch]

I have updated my animated map of the drive with the latest move. The segment from the last to the current way point does not have intermediate points in the geojson, unlike the previous segments. That is why it looks accelerated. On the technical side, I automated getting the traverse and converting it to the animation, as well as plotting the way points. So, if the the format of the source geojson does not change, the link should auto-update after new drives, at the same time when the Where is Perseverance map updates. I also added a perspective view (NORTH) which may be helpful in getting a sense of the subtle topography.

double click to recenter, middle button to pan, right button or wheel to zoom. There is a RESET button to the rescue if you get lost.

[Ant103]

Sol 22 MZ mosaic @110mm. Very rocky terrain ahead !

[Marvin]

They opened a cover on the sample receiving part on the rover, does this cover remain permanently open ?

This document also says it's a "one-time release door":

https://sites.nationalacademies.org/cs/grou.../ssb_180772.pdf

It seems counter-intuitive to have an open hole allowing dust to be blown into the rover.

Internally, the rotating carousel looks like this:



The literature says there are nine different drilling bits (in blue). Maybe the gray one at around 3 o'clock is null or closed, rotated to this position when not in use?

[Phil Stooke]

News from LPSC: I just asked Roger Wiens if the Supercam images will be available on Raw Images - yes. starting in a few days.

Phil