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TEGA - Round 2
01101001
post Sep 29 2008, 04:59 AM
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QUOTE (Aussie @ Sep 28 2008, 09:45 PM) *
Where was this sample from? Ice or salts?


Smart money's on organic-free blank. It's the whitest thing around.

The wind was blowing when the delivery was attempted, if you believe the telltale. It was hopping around 10:30 local time that sol.

Sol 122 Raw Images

For instance, at 1033 local:
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Shaka
post Sep 29 2008, 05:19 AM
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mad.gif Aw, hell!.....and I was gonna make a snowman!


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01101001
post Sep 29 2008, 11:47 AM
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Sol 123 Raw Images

Source of the white stuff, the Organic-Free Blank:


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ElkGroveDan
post Sep 29 2008, 01:45 PM
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The Organic Free Blank (OFB)

http://www.lpi.usra.edu/meetings/lpsc2008/pdf/1067.pdf (top of page 2)

QUOTE
The Phoenix OFB will be used only if organic C is detected on Mars by TEGA. The OFB will then be sampled and analyzed, and results will be compared to the organic signatures released by the Martian sample. After OFB analysis, a TEGA run will be conducted on a second sample of the putative organic-containing material to validate the first analysis. High concentra-tions of organic molecules and possibly organic frag-mentation patterns not in the OFB will also contribute to a credible positive identification of organic mole-cules indigenous to Mars. The high total carbon con-tent in the OFB FM (1.6 μg C g-1 of sample) may re-quire that the total C content in the Martian materials substantially exceed this number, perhaps as much as 10 μg C g-1 of sample before a positive detection of organic molecules on Mars is credible.

MARS 2007 PHOENIX SCOUT MISSION ORGANIC FREE BLANK: METHOD TO DISTINQUISH MARS ORGANICS FROM TERRESTRIAL ORGANICS. [/b]
D.W. Ming1, R.V. Morris1, R. Woida2, B. Sutter3, H.V. Lauer3, C. Shinohara2, D.C. Golden3, W.V. Boynton2, R.E. Arvidson4, R.L. Stewart5, L.K. Tamppari6, M. Gross6, P. Smith2, and the Phoenix Science Team. 1ARES, NASA Johnson Space Center, Mail Code KX, Houston, TX 77058 (douglas.w.ming@nasa.gov), 2Lunar & Planetary Laboratory, University of Arizona, Tucson, AZ, 3Jacobs Engineering, ESCG, Houston, TX, 4Dept. Earth and Planetary Sciences, Washington University, St. Louis, MO, 5Corning Incorporated, Corning, NY, 6Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA.


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ConyHigh
post Sep 29 2008, 02:10 PM
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QUOTE (Aussie @ Sep 28 2008, 09:45 PM) *
Maybe. But it could also be an image taken when the scoop stopped at the end of a left to right swing while vibrating. The material in the scoop funnel seems to be concentrated to the right of the funnel which would imply movement of the particles through inertia when the scoop stopped, with the particles that fell out moving to the right. Inertia rather than wind energy. The CSA Mars Weather Report hasn't been updated since Sol 99 so we don't know what the wind was at ground level. But from the Sol 122 TEGA (1041) image the material ended up on the left of the oven lid as well so delivery would have been on target.

Where was this sample from? Ice or salts?


Mars weather report from Sol 109 is on the Univ. of Arizona Phoenix web page.
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climber
post Sep 29 2008, 04:23 PM
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QUOTE (ElkGroveDan @ Sep 29 2008, 03:45 PM) *
The Organic Free Blank (OFB)

We do not want talking about the subject of the press conf, don't we ? tongue.gif


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ElkGroveDan
post Sep 29 2008, 04:30 PM
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QUOTE (climber @ Sep 29 2008, 09:23 AM) *
We do not want talking about the subject of the press conf, don't we ? tongue.gif

They are probably going to unveil a picture of a beautiful sunset. That's all. wink.gif


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ConyHigh
post Sep 29 2008, 05:03 PM
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QUOTE (ConyHigh @ Sep 29 2008, 07:10 AM) *
Mars weather report from Sol 109 is on the Univ. of Arizona Phoenix web page.

And Sol 112 weather now up.
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Fran Ontanaya
post Sep 29 2008, 05:18 PM
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Mmh, during the last press conf they wore a witch hat to talk about Wicked Witch.

I wonder if they'll talk about Snow White today. laugh.gif


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climber
post Sep 29 2008, 08:26 PM
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QUOTE (Shaka @ Sep 29 2008, 07:19 AM) *
mad.gif Aw, hell!.....and I was gonna make a snowman!

so, you KNEW IT : http://www.jpl.nasa.gov/news/phoenix/relea...?ArticleID=1886


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CosmicRocker
post Oct 4 2008, 04:02 AM
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Hmm, it appears Christmas has fortunately come early to Phoenix. Not only has snow been detected, but also some decent evidence for carbonate and clay. That's pretty exciting news. smile.gif


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peter59
post Oct 18 2008, 06:40 AM
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The Phoenix Mars Lander's robotic arm successfully delivered soil into oven six of the lander’s thermal and evolved-gas analyzer, or TEGA, on Monday, Oct. 13, or the 137th Martian day, or sol, of the mission.
The University of Arizona news.


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akuo
post Oct 18 2008, 08:40 AM
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That's some good news at least. No mention where the soil was from, though. The article also mentions that six of the ovens have been used so far. Therefore there has been one succesful delivery between the last teleconf and this sample acquisition. Likely an OFB sample delivery was finally succesful?

I may be judging the goals of the TEGA without full information, but I feel that the instrument will have failed unless they manage to sample the ice completely. This is seperate from the actual mission goals, which always are set very conservatively for the equipment and the luck of the draw in the actual landing site. The mission goals would have been satisfied if Phoenix had landed in a completely dry place, with no ice at all.

Considering that they have landed in a place with obvious and abundant ice within easy access, it will be a huge disappointment if that ice isn't analysed properly.

Phoenix was extensively tested to make sure that all the critical gremlins in the landing process were found. The same dilligence should be applied on the most important science instruments of the mission. This doesn't help Phoenix at the moment, but must be taken into consideration for complex future instruments with expected mission times many times the Phoenix prime mission.


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mcaplinger
post Oct 18 2008, 02:48 PM
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QUOTE (akuo @ Oct 18 2008, 01:40 AM) *
Phoenix was extensively tested to make sure that all the critical gremlins in the landing process were found. The same dilligence should be applied on the most important science instruments of the mission.

Well, duh. (For non-native English speakers, that denotes a reaction to a very obvious statement.)

This was done for every instrument on Phoenix. It's just that you really can't test one-shot operations that will be performed in conditions and with materials that simply can't be replicated on Earth, if they are even known in advance. Is TEGA in 20-20 hindsight poorly designed? I have no idea. Was it "extensively tested"? Of course it was.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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centsworth_II
post Oct 18 2008, 04:25 PM
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QUOTE (akuo @ Oct 18 2008, 03:40 AM) *
...it will be a huge disappointment if that ice isn't analyzed properly.

Yes, but saying "the instrument [TEGA] will have failed unless they manage to sample the ice completely" is way off. TEGA provided much soil analysis data.
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