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MARDI microphone, maybe possibly it'll be turned on?
Paul Fjeld
post Sep 19 2008, 03:59 AM
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If the camera's 22 degrees pointing out, and slightly away, to the west, from the nearest jet, then I don't think MARDI can see the HolyCow plume effect. I make the centerline of the camera about 18 inches from the nearest jet in the science deck plane (I think X/Y). The camera is below the deck some 5 inches, and that's about 3 feet (?) from the surface. A little trig tells me they'll miss it by half a foot, guessing the size of each "skating rink" to be maybe a foot and a half in diameter(??)

That's back of the envelope, so it's just a guess.
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elakdawalla
post Sep 19 2008, 04:09 AM
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OK, I've got more details for all of you! Enjoy.

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djellison
post Sep 19 2008, 07:11 AM
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Round up a bit. 66 deg FOV, 22 deg out-from-Nadir pointing.

That means 22 degrees of FOV inside of Nadir from the camera, and 44 degrees outside of Nadir.

Assuming a height of, say, 100 cm...

I make it 40cm of terrain inside a point directly under MARDI and 96 cm of terrain outside it ( Tan Theta = Opposite (the distance on the ground) over Adjacent ( the height of Mardi above the ground ) )




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climber
post Sep 19 2008, 09:53 AM
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Now that we "know" where Mardi is, can we determine the mike position relative to the incoming (main) wind and weather it'll pick up the wind strait or be shadowed by Mardi itself?


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mcaplinger
post Sep 19 2008, 01:33 PM
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QUOTE (climber @ Sep 19 2008, 01:53 AM) *
can we determine the mike position relative to the incoming (main) wind...

The microphone is more or less omnidirectional, and pointed in the same direction as the optics. You can see it in photos of the instrument; for example http://www.msss.com/phoenix/mardi/illustra.../phx_mardi2.jpg (you probably knew this already.)

I don't know where the prevailing wind is from.


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ustrax
post Sep 19 2008, 02:06 PM
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Now...wouldn't it be great to capture another DD sequence with a wooooosh as soundtrack?... smile.gif


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Paul Fjeld
post Sep 19 2008, 04:37 PM
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QUOTE (djellison @ Sep 19 2008, 02:11 AM) *
Round up a bit. 66 deg FOV, 22 deg out-from-Nadir pointing.

That means 22 degrees of FOV inside of Nadir from the camera, and 44 degrees outside of Nadir.

I think your arithmetic is wrong. The centerline of the camera is moved out 22 degrees. So straight down you get 33 degrees inside and outside of nadir. When you move the centerline out, it's 33 - 22 degrees inside of nadir.
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Guest_jumpjack_*
post Oct 2 2008, 07:12 AM
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It would be really cool to hear Phoenix digging Mars soli!
I stay tuned for news... Pleas keep us informed! smile.gif
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ElkGroveDan
post Oct 2 2008, 01:45 PM
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QUOTE (mcaplinger @ Sep 19 2008, 06:33 AM) *
The microphone is more or less omnidirectional, and pointed in the same direction as the optics. You can see it in photos of the instrument; for example http://www.msss.com/phoenix/mardi/illustra.../phx_mardi2.jpg (you probably knew this already.)



Glad to see the Swiss Military were part of the MARDI team.


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Decepticon
post Oct 3 2008, 12:35 AM
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When can we expect science return?
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CosmicRocker
post Oct 4 2008, 04:36 AM
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There was a small comment about when the microphone might be turned on in this news release.

QUOTE
The Phoenix mission, originally planned for three months on Mars, now is in its fifth month. However, it faces a decline in solar energy that is expected to curtail and then end the lander's activities before the end of the year. Before power ceases, the Phoenix team will attempt to activate a microphone on the lander to possibly capture sounds on Mars.

It sounds as if this experiment has a rather low priority. Is that because the event might trigger a fault?


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centsworth_II
post Oct 4 2008, 05:06 PM
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QUOTE (CosmicRocker @ Oct 3 2008, 11:36 PM) *
There was a small comment about when the microphone might be turned on...

Could they be planning to turn the microphone on only after there is insufficient power for digging? I was hoping to hear the sounds of Phoenix scrapping the surface of Mars. I suppose the next most interesting sound would be the solar panels creaking in the wind.
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Deimos
post Oct 5 2008, 02:21 AM
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SSI and MECA-OM are noisy.

I don't think the microphone is being deliberately delayed. It is just not the highest priority thing to work on--using equipment in a "new" way after months of thermal cycles is something that needs to be approached with care. There is special concern during RA use. That's not to say it won't happen, but I'd be surprised if it happened first.
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mcaplinger
post Oct 9 2008, 12:47 AM
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Does anyone know where the SSI exposure times might be tabulated? I need them to compute some exposure times for another instrument on the surface that may be operated soon rolleyes.gif


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01101001
post Oct 9 2008, 01:00 AM
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QUOTE (mcaplinger @ Oct 8 2008, 05:47 PM) *
Does anyone know where the SSI exposure times might be tabulated?


Like this?

QUOTE
Integration time 0-335 s in steps of 5.12 ms


From Texas A&M University Surface Stereo Imager Vital Statistics

From Texas A&M University Phoenix Surface Stereo Imager (SSI)
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