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TEGA - Round 2
marsophile
post Oct 20 2008, 04:11 PM
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Apologies for my last post; it is clear on re-reading that the previous posters were well aware of the rationale for the D/H measurement.
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01101001
post Oct 20 2008, 05:06 PM
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QUOTE (marsophile @ Oct 20 2008, 09:04 AM) *
The whole point of the D/H measurement for both the ice table and the atmosphere is to see if they are different, because that would indicate whether the ice table is ancient (possibly from an earlier ocean) or recent (from H2O frost or snow).


I believe they are coming to that conclusion independently of the D/H measurement. From the September 29 briefing, my contemporaneous notes, not a direct quotation, of Peter Smith's opening was:

QUOTE
Ice is connected to ice in atmosphere.

Shows panorama, and notes patterned ground, polygons and troughs, and where ice is under each. Don't see large rocks or dunes. Not much brought in by wind. Nearby: Helmdal Crater, a new crater (just 1 million years). This is not ancient, but new environment. What do we know?

Snow's coming down. Vapor in atmosphere. Vapor can freeze out on ice layer.


I don't recall how they are coming to that conclusion. In the same, was my note:

QUOTE
Haven't looked at ice isotopics.
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Ipparchus
post Oct 25 2008, 05:48 PM
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Do you know which TEGA ovens are full and with which samples? I really want to know the last sample deliveries! are we going to have an ice sample delivery? WHEN? Did they succeed with the WCL-3 try to push the sample into the cell?
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01101001
post Oct 26 2008, 07:16 AM
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QUOTE (Ipparchus @ Oct 25 2008, 10:48 AM) *
Do you know which TEGA ovens are full and with which samples? I really want to know the last sample deliveries! are we going to have an ice sample delivery? WHEN? Did they succeed with the WCL-3 try to push the sample into the cell?


I don't think they've announced the results of assisting soil into MECA WCL 3. I'm not sure, but I think the clog is shown before and after in robotic arm images from sol 147 raw images. It shows a mound that appears to to have been mashed. I haven't compared the scenery, or metadata, to see if it's near MECA WCL 3, nor have I examined the image to see parts of the MECA.

My scorecard for used ovens, at the end of September, is above. I'm pretty sure ovens 4, 5, 0, 7, and lately 6 have been announced to be filled.

Oven 3 still appears unopened.

Oven 2 had an organic-free blank delivery attempt during a windy time and probably little to no matter entered; I saw no announcement of success.

Oven 1 had at least 2 icy soil attempts, one missed, one clumped; I saw no announcement of success.

According to a recent press release (Phoenix Lander Finishes Soil Delivery to Onboard Labs), they are through attempting sample deliveries to anything.

A Mid-October press release (Phoenix Gets Bonus Soil Sample) said 6 of 8 ovens have been used, but doesn't specify which, or exactly what 'used' means -- attempted, delivered to, succesfully?
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centsworth_II
post Oct 26 2008, 02:26 PM
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QUOTE (1101001 @ Oct 26 2008, 03:16 AM) *
...Oven 3 still appears unopened.....

And that is one of the end ovens that should open well. I was hoping it was being saved for one last attempt at getting an ice sample into an oven.
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Paul Fjeld
post Oct 28 2008, 07:37 PM
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Looking at Mark's page for SOL 152: "Re-place RA..." . So that's it for arm ops? I guess that's what the last few days of grooming and DOC pics were about.

Sad about the ice...
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Phil Stooke
post Oct 28 2008, 08:59 PM
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"Re-place" might not mean it's over for the arm (though it must be soon) - but it looks like we are getting to the point of alternating charging days and activity days.

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Deimos
post Oct 28 2008, 10:42 PM
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A combination of a weekend plan, lower than normal opacities (colder nights), and then high opacities (less power) made it clear that the attempt to stretch out the final days of the RA and TEGA was just not workable. So, as the news release said, the survival heater for the RA, TEGA, and RAC/OM electronics is being shut off tonight (sol 152 afternoon). Any further attempted motion of the RA risks leaving it arbitrarily placed, so I doubt that would happen. RAC/OM imaging may be possible without the heaters, but the warranty is definitely voided. Personally, I expect the RA is already in its final resting place--but if the weather is much improved for sol 152 (in progress), the science plan would execute, attempting to optimize the placement. Either way, there is no option to delay the switch.

The good news is that this frees up much power, so once Phoenix is healthy again, the discharge/recharge cycle can be broken. Even so, the science-days are short. Sol 154 should be the first sol of the rest of the mission, and we should be able to start a final pan of the workspace and RA (and maybe settle any TA-3 door configuration pools).

BTW, I believe the most recent set of RAC images starts here: http://phoenix.lpl.arizona.edu/images.php?...203&cID=375
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Harder
post Oct 29 2008, 04:00 PM
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Is it known how the last TEGA days have been spent? E.g. heating all remaining samples a bit, just to get to the peroxide released, or doing perhaps only one sample but analyzing it in full?
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01101001
post Nov 1 2008, 06:53 AM
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QUOTE (Harder @ Oct 29 2008, 09:00 AM) *
Is it known how the last TEGA days have been spent?


Nothing in the press releases. But, they've probably been too busy to say, if they've done anything along those lines.
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