On the Road Again - volume 8 - Page 10

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Posts: 5

Reply: 181

PostPosted: May 11, 2011 1:21 PM 

Kye; Thanks for the info. Semms like a reasonable explanation.

So not much going on around here for the last 100k except a little dust blowing around. Surprised


Posts: 3465

Reply: 182

PostPosted: May 11, 2011 4:41 PM 

sol 2593 ( May 11, 2011 ) R0 3x1 in next drive direction:

with a link to the L2 3x1 panorama.

Wow. Yesterday's parallax measurement to the crater is 279 +/- 40 meters and today's is 75 +/- 3 meters. So today's drive was 204 +/- 43 meters. Even taking the extremes of 239 and 78 means today's drive was at least 161 meters.


Posts: 5

Reply: 183

PostPosted: May 11, 2011 5:30 PM 

Looks like we could be passing one of those "round dust mesas" just ahead on the right.. Need to keep an eye out. Smile


Posts: 3465

Reply: 184

PostPosted: May 11, 2011 5:40 PM 

According to a twitter from MarsRoverDriver:

Another 117m yestersol. Will do only ~ 70m thisol (only 75 minutes to drive), pulling up near Skylab Crater and imaging it.

But this was sent 4 hours ago and it is now sol 2593 @23:40 LST and tosol's drive 2593 is over.

He claims only 117 meters driven "yestersol"?

And this crater is named "Skylab"??

I'm sooo confused.


Posts: 3465

Reply: 185

PostPosted: May 12, 2011 5:11 PM 

sol 2594 ( May 12, 2011 ) R0 6x1 near "Skylab" crater:

with map location and pancam L2 3x1 detail in next drive direction links.

The dust looks a little thicker than usual.


Posts: 3465

Reply: 186

PostPosted: May 13, 2011 6:58 AM 

The sol 2595 ( May 13, 2011 ) drive should be happening... now ( 11:59:34 LST ).

Before driving away a 7x1 L257R2 panorama was done of Skylab crater. ( Maybe see all of it in a few months? )

I find the shape of the crater and the ejecta field of Skylab crater very interesting.

This chapter, Formation of Impact Craters discusses the liquid drop model formation of craters.

Which got me to thinking about what happens to the drop and the column on an off axis impact:

If you look carefully to the right of the crater you will see a small circular debris field that wants to match the missing debris in the center of the crater. Also note the ray of debris from the crater to this debris field.

NOW for the fun part. What happens to the central "drop" and "column" when the impact is decidedly not normal to the surface??

Would the resulting crater look something like Skylab?

How literally can we take the liquid drop model? Can the impact angle be inferred from the distance of the "drop" from the center of the crater? Can the impact material be inferred from the "splash"?

This crater seems too small to create an actual liquid rock melt - but would the impact of, say, a block of ice into a dusty, rocky surface look something like this?

Here is a suggestive video of water drop "crater" formation in dry, granular material and here is a paper modelling the effect.

Mars. Damn queer place.

Psych Author Profile Page

Posts: no

Reply: 187

PostPosted: May 13, 2011 8:26 AM 

Google Skylab and Cape York together. You might see why that particular name for this mess.


Posts: 1661

Reply: 188

PostPosted: May 13, 2011 8:50 AM 

...is there any reason for water not to be present on the early planet Mars when 'some' of the meteors hit its shallow watery surface, especially the large flat Meridiani Planum Oppy is on now? I can see that happening-can anyone else?



Posts: 3465

Reply: 189

PostPosted: May 13, 2011 9:08 AM 

er, Psych I don't see why this crater was named Skylab.

According to the first result from the google, Skylab plunges to Earth on page 335: burning pieces of Skylab were scattered over an area 64 kilometres wide and 3,860 kilometres along the flightpath.

I couldn't find any reference to an actual crater anywhere.

The more interesting hit was The road to Endeavour, Stuart Atkinson's Mars rover blog. It is a must visit for MER fans.

Kevin Author Profile Page

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Reply: 190

PostPosted: May 13, 2011 11:09 AM 

Stu used to post here many years back, a few Trolls drove him away, shame.

Was Skylab formed by a low speed impact? Is it possible that a piece from the Endeavour impact ended up here?

Shallow water is also worth a shout as there was no surface depressions around Block Island which must weigh a few Tons.

Yep Mars is a strange place, it makes you scratch your head a lot.


Posts: 3465

Reply: 191

PostPosted: May 13, 2011 5:04 PM 

sol 2595 ( May 13, 2011 ) L0 3x1 in the next drive direction:

with a pancam detail link.

The 5 meter crater ahead is about 41 meters distant. The drive was about 93 meters.

In the last week ( sol 2588 to 2595 ) Oppy drove 2/3 km!


Posts: 73

Reply: 192

PostPosted: May 13, 2011 5:07 PM 

Stu was not attacked by trolls. Stu was caught up in a conflict between me and Doug, of UMSF. In typical journalistic fashion he was trying to post on both sites. This would be possible if he did not attempt to support both prospectives.

This happened at a time when temperatures between some here and some there were hot. I am sure Stu still lurks here. Why? Because a lot of great things come out of this forum and Stu looks for great things. He is free to post here I am sure, and will do so when he gets over himself, as I did.


Posts: 3062

Reply: 193

PostPosted: May 13, 2011 6:54 PM 


Very nice blog!!


Bill Harris

Posts: 3

Reply: 194

PostPosted: May 13, 2011 7:48 PM 

And at USF I see that Doug is making new member Eutectic feel welcome. Rolling Eyes

If he reads this site, he's welcome here.


Psych Author Profile Page

Posts: no

Reply: 195

PostPosted: May 13, 2011 8:28 PM 

My first hit was on a book, The mammoth book of space exploration and disasters, by Richard Russell Lawrence. From the section 'Skylab plunges to Earth': "The crash line is from Esperance in Western Australia to Cape York in Queensland."

What threw me was the jump from Mercury missions to Skylab without any mention of the Gemini Missions in between...


Posts: 5

Reply: 196

PostPosted: May 13, 2011 8:30 PM 

Could someone post here, Barsoomers reply 19 image in the Natural History of Crested------

I think it shows a good example of "soft sediment deformation ". THanks.

Psych Author Profile Page

Posts: no

Reply: 197

PostPosted: May 13, 2011 10:25 PM 

There may be an 'inside joke' there, Skylab never made it as far as Cape York...Skylab crash line. It 'splashed' into the Australian desert.


Posts: 344

Reply: 198

PostPosted: May 13, 2011 10:31 PM 

Here it is, Ben.


Posts: xxx

Reply: 199

PostPosted: May 13, 2011 10:34 PM 

Ben, I think you are spot on with that diagnosis. Barsoomer has found further evidence of surface water and if this is indeed soft sediment deformation then it is a significant find (take a bow Barsoomer). This type of feature requires a high deposition rate and typically a reasonably turbulent fluvial environment such as a river, a delta or a shallow water sea or lake that is current or wave affected. An environment with more water and turbulence than the playa setting on top of the mound. Of course we only have this reasonably long range shot and I guess that this will be another rear view mirror analysis. But all the jigsaw pieces are coming together to indicate that the sediment deposition in this area, and by inference the sediments deposited in Endeavour, were emplaced by fluvial action.


Posts: 5

Reply: 200

PostPosted: May 13, 2011 11:28 PM 

Thanks Barsoomer; I am also interested in the kobby rocks to the left and in back.

I wonder if they could be conglomeratic?

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