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MET - Lidar & Telltale
Astro0
post May 30 2008, 04:54 AM
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Windy on Sol 3 between 15:50:08 and 15:55:44 local.
Gamma enhanced to see the image in the mirror.
Attached Image

Enjoy
Astro0
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Shaka
post May 30 2008, 05:53 AM
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QUOTE (Astro0 @ May 29 2008, 06:54 PM) *
Windy on Sol 3
Enjoy
Astro0

OUTSTANDING, Keemosobbee!
So we'd like one of those at least daily, with a weekly 'fast forward' summary.
Of course, the Canucks should really do it (What about it, "Steve G"?).
But if they can't get a round toit, you can hold up The Commonwealth's end.
TIA cool.gif


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Deimos
post May 30 2008, 05:54 AM
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QUOTE (Astro0 @ May 30 2008, 05:54 AM) *
Windy on Sol 3 between 15:50:08 and 15:55:44 local.


Good job. Thought you might like to know the animation is posted (with credit) for the PHX team. We'd normally have made it ourselves ... but the data hit the web long before it hit the SOC. (And I knew if I looked here I could avoid downloading the public data to make it myself.)

Mark
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djellison
post May 30 2008, 07:48 AM
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Practice what you preach and all that, I'm posting a thread on a sub-element of Phoenix activities.

This movie sequence was on Sol 3- you can see the laser firing, I think.

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jamescanvin
post May 30 2008, 08:15 AM
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Nice. Well spotted.

EDIT: Posts about MECA (the Microscope) split to a new thread


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djellison
post May 30 2008, 09:03 AM
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I'm on there, so are Helen and the much missed Suzi.

You're all members of The Planetary Society right. (anyone who says No at this point, hang your head in shame) So all our names should be on there.

Doug
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hal_9000
post May 30 2008, 11:59 AM
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.GIF



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Guest_PhilCo126_*
post May 30 2008, 02:16 PM
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Guests






Some background info on this Canadian/Danish experiment on Phoenix Lander
The 350 kg Phoenix Lander carries a meteorological station to measure daily conditions on the arctic pole. The most visible part is a 1.1 meter meteo-mast on the deck of the lander. However an original wind indicator was eliminated from the design, the Canadian Space Agency together with the Aarhus University in Denmark constructed an 8 cm curved device called a “telltale” which holds a tiny wind indicator tube on a short Kevlar string. The telltale is observed by the stereoscopic camera system, aimed at a small mirror under the dangling target, to reveal wind movements.
Thanks again for pointing it out in the photos taken so far!!!
cool.gif
The other Philip
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ElkGroveDan
post May 30 2008, 02:29 PM
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QUOTE (djellison @ May 29 2008, 11:48 PM) *
you can see the laser firing, I think.

You can also see the reflection of the sun moving overhead in the glint along the side of the instrument. Way cool.


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Airbag
post May 30 2008, 05:25 PM
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Lots of details on the tell-tale at:

http://www.marslab.dk/Filer%20til%20Tellta...rojectNews1.htm

I agree with a previous poster in one of the other topics that it looks as if the "kink" in the wire is not how it looked when "new"; perhaps a little damage resulting from the various (planned and designed for) vibrations at launch and landing. Indeed, the "pre launch" image (from the page above) shows what appears to be a straight(er) "wire":

http://www.marslab.dk/Filer%20til%20Tellta...elltaleATLO.jpg

The tell-tale was basically just dangling free during launch and landing, and was no doubt shaken all over the place!

Airbag

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ilbasso
post May 30 2008, 08:43 PM
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Is the lower Martian gravity partially an explanation for the wire not being straight? The weight obviously is not pulling as hard against the wire on Mars as it was on Earth. If there were any bias or bend in the wire before it was launched, its effects would be amplified once on Mars.


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remcook
post Jun 2 2008, 08:31 PM
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yes, I noted that a while back too---the thread seems bend permanently. Not seen a confirmation wherther this is really the case..anyone knows? (sorry, am on holiday, so can't check the forum thoroughly and am not that up to date)
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Saevar Helgi
post Jun 5 2008, 10:19 PM
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Hi there! My first post here though I've been reading the forum for more than a year. My friend Björn Jónsson told me about this forum some time ago, and I'm always amazed at how knowledgeable everyone here seem to be and also how terrific you are at image processing. I'm a geology student who is going to study planetary sciences in the not so distant future.

Anyway, I sent one scientist I know who's on the Telltale science team, Haraldur Páll Gunnlaugsson at the University of Aarhus, an e-mail in which I asked about the kink. This is his response:

QUOTE
The suspension structure of the Telltale line is made from braided Kevlar fibers (same material as used in bullet-proof west's), and this material has internal tension and bending that could not be avoided in the construction. Pictures below show the unit before launch and after landing. The bend was also observed on Earth before launch. If anything, it seem more pronounced on Mars, and this is due to the reduced gravity on Mars, where there is not the same force pulling the string.


I also asked if the Telltale is offset due to the kink and he said:

QUOTE
Taking all factors into account such as the tilt of the lander, tension of the Kevlar fibers and misalignment of the mirror etc., the rest position (equilibrium position in zero wind) of the Telltale is slightly shifted relative to the centre of the orientation marker. The rest position of the Kapton part is approximately 3 mm below and 1 mm to the left relative to the centre of the orientation marker in the mirror image.


He said that the kink has no effects whatsoever. Hope this clarifies something.

*Edited to remove the password protected embedded image link - Helvick.
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climber
post Jun 5 2008, 10:35 PM
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Welcome on board Saevar Helgi!
Very significant and informative post. Thanks


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Astro0
post Jun 6 2008, 06:37 AM
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Windy on Sol11 between 12:31:51 and 12:44:34 local.
Attached Image


Just curious about something. I noticed that the numbers on the Phoenix website for each image and the time noted against each for when they were taken don't seem to follow a logical progression.
eg: Img3207 taken at 12:37:28; Img3208 @ 12:44:34; and Img3213 @ 12:31:51 etc
Weird huh.gif

Anyone have any ideas?

Astro0
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