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jamescanvin
Posted on: Aug 16 2005, 12:36 AM


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QUOTE (djellison @ Aug 15 2005, 05:27 PM)
MARCI will do observations of the Moon at some point - and HiRISE will do I THINK Moon + Star focus tests.  Not sure of CTX, it may do the same.

Only one post-aerobraking deployment was mentioned, and that was SHARAD

Doug
*


Yes, I'd remembered it wrong (or read something unclear, can't remember). On further investigation it seems the only instrument with a cover removed after aerobreaking is CRISM.
  Forum: MRO 2005 · Post Preview: #17165 · Replies: 18 · Views: 18787

jamescanvin
Posted on: Aug 14 2005, 11:16 PM


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QUOTE (Bob Shaw @ Aug 13 2005, 10:34 PM)
Does anyone know if MRO is to take any test shots of the Earth and Moon?
*


I think the cameras have covers over them to protect the optics till after aero-breaking, so I suspect the answer to this is no.


J
  Forum: MRO 2005 · Post Preview: #17046 · Replies: 18 · Views: 18787

jamescanvin
Posted on: Aug 11 2005, 05:56 AM


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QUOTE (dilo @ Aug 11 2005, 03:24 PM)
Mars attack!  huh.gif  ohmy.gif  blink.gif Sol568
An entire DD moving front... I counted 7, maybe more... need avatar update!
*


ohmy.gif ohmy.gif Wow! smile.gif
  Forum: Spirit · Post Preview: #16728 · Replies: 142 · Views: 142446

jamescanvin
Posted on: Aug 11 2005, 04:52 AM


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QUOTE (blobrana @ Aug 11 2005, 02:21 PM)
Hum,
The word on the street says that there is already an asteroid called (10386) Romulus....

List of Asteroids (180Kb)
*


Yes, but not one named Remus which was lucky.
  Forum: Cometary and Asteroid Missions · Post Preview: #16721 · Replies: 4 · Views: 6551

jamescanvin
Posted on: Aug 9 2005, 02:23 AM


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Can't get enough of looking out of the window while flying. Which does mean I'm sitting here rather tired after flying back to Australia from a two week trip back to the UK yesterday! Worth staying awake for as just in the last, err, lets say 3 days, i've seen:

The Arctic ocean in twilight at local midnight,
Snow on the Ural Mountains,
The vast wilderness of Siberia,
The worlds longest suspention bridge (Akashi Kaikyo Bridge in Kobe) (landing at Kansai),
Dolphins off the Australian coast while on approch at Brisbane,
All the sights of Sydney, Harbour bridge, Opera house, etc.

Worth spending all that time squashed inside a metal cylinder!

Only problem is I now have two weeks of all your posts to catch up on! Slow down guys! smile.gif

James
  Forum: Chit Chat · Post Preview: #16565 · Replies: 14 · Views: 12958

jamescanvin
Posted on: Jul 12 2005, 08:05 AM


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Yes it looks like when the real image comes down they replace the stamp image on with a 200 x 200 pixel scaled image which is MUCH better smile.gif cool.gif
  Forum: Tech, General and Imagery · Post Preview: #14254 · Replies: 16 · Views: 15121

jamescanvin
Posted on: Jul 12 2005, 02:19 AM


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QUOTE (djellison @ Jul 11 2005, 10:18 PM)
http://marswatch.astro.cornell.edu/merweb/merweb.pl

Using that - you can see that Spirit is FINE - and has been imaging a LOT

*


Thanks Doug, great link for times when the images are not coming through.

In case you haven't noticed, if you click on 'Table of All Images For All Sols' and then by clicking on the links in the 'Seq.Ver.Iter' colum you get a page with the very small 'stamp' images that come down from the rovers. It's good to be able to keep getting my daily 'fix' of mars images, even if it's in small doses!

James
  Forum: Tech, General and Imagery · Post Preview: #14247 · Replies: 16 · Views: 15121

jamescanvin
Posted on: Jul 5 2005, 10:06 AM


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I think ohmy.gif sums it up really!

I can't wait... smile.gif
  Forum: Tech, General and Imagery · Post Preview: #13861 · Replies: 945 · Views: 729981

jamescanvin
Posted on: Jun 29 2005, 12:29 AM


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QUOTE (hal_9000 @ Jun 29 2005, 10:10 AM)
I want to know more about Spacecrafts' OS!
How to work a OS in a spacecraft?
What OS work in Mars Rovers?
*


Google is your friend, try it. wink.gif

For instance,

Searching: MER Mars operating systems

Top hit is:

http://www.space.com/businesstechnology/te...ter_040128.html

which says:

QUOTE
"[JPL] needed the tools to be able to develop their mission software on a system from someone with a proven track record," explained Steven Blackman, director of business development for aerospace and defense for the software company Wind River. The Alameda, California-based company developed the VxWorks real-time operating system used in aboard the MER rovers, as well as other NASA and European Space Agency missions.


Easy! smile.gif
  Forum: Chit Chat · Post Preview: #13380 · Replies: 19 · Views: 16449

jamescanvin
Posted on: Jun 23 2005, 04:26 AM


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Hubble has caught a fantastic image of the Fomalhaut dust ring...

Elusive Planet Reshapes a Ring Around Neighboring Star

James
  Forum: Telescopic Observations · Post Preview: #13014 · Replies: 11 · Views: 8789

jamescanvin
Posted on: Jun 16 2005, 12:21 AM


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QUOTE (dilo @ Jun 16 2005, 09:52 AM)
A sad question/consideration. The impactor uses a high-precision star tracker, which imply some kind of optical instrument... why they didn't planned to use it (or add a dedicated small camera) to take a "movie" of nucleus approach?
Even using a low resolution and limiting bit rate (let's say, one picture/min) last images should easily reach sub-meter resolution of pre-impact area, a result impossible even with perfectly focused HRI... sad.gif
*


It will.

From the Press Kit:

QUOTE
The impactor begins science imaging 22 hours before impact with a pair of full-frame
images -- one exposed for the nucleus, and one exposed for the coma, the dimmer
cloud that surrounds the nucleus. Similar image pairs will then be obtained every two
hours until 12 hours before impact. At that time, the impactor will spend two minutes
taking the same pictures and other data that it will collect during the final two minutes
before impact. This demonstration is designed to verify that it will execute this critical
data-taking correctly during the final and most critical segment of its mission.
Beginning 10 hours before impact, images will be taken every two hours until 8 hours
before impact; every hour from 7 to 4 hours before impact; and every 30 minutes from
3 to 1 hour before impact. At that time, the pace of imaging will increase until it reaches
a maximum of one picture every 0.7 second at about 12 seconds before impact.
Engineers say that odds are at least 50-50 that dust hitting the impactor will end transmission
of its images during the final 10 seconds before impact. The final potential
image that could be transmitted in its entirety is one scheduled at about 2 seconds
before impact, with a scale of about 20 centimeters (approximately 8 inches) per pixel.
  Forum: Cometary and Asteroid Missions · Post Preview: #12591 · Replies: 192 · Views: 113457

jamescanvin
Posted on: Jun 15 2005, 06:52 AM


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QUOTE (Pando @ Jun 15 2005, 04:16 PM)
I think Oppy is hovering somewhere in the low-to-mid 400Whr range in the past few sols...
*


Any idea how much of that is due to atmospheric dust as opposed to dust on the panels? i.e what was the power output the last time tau was low?

Thanks, James
  Forum: Opportunity · Post Preview: #12512 · Replies: 17 · Views: 17892

jamescanvin
Posted on: Jun 15 2005, 02:40 AM


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Given Steve Squyres consern for the upcoming dust storm season:

QUOTE (Steve Squyres)
And in the "it's always something" department... we are now facing a new threat to both vehicles. It is dust storm season on Mars. Dust storm season happens once per martian year, during the southern summer when the input of solar energy into the martian atmosphere is highest. And southern summer is now upon us. The atmospheric dust levels at both of our landing sites are high and climbing, and in fact the dust level at the Opportunity site is the highest we've ever encountered. It's not a serious threat yet, but it's a worry, and we're watching the dust levels in the atmosphere very closely.

The thing to realize about dust storms is that the threat is not high winds, nor is the primary threat dust buildup on the solar arrays. Instead, the primary threat is simply the attenuation of sunlight by dust that is suspended very high in the atmosphere, and the resultant loss of power from our solar arrays. RIght now we've got power to spare on both vehicles, and there is no imminent danger. But martian dust storms are notoriously hard to predict. In some years things are pretty quiet, and in other years what starts out as a small regional storm can blow up quickly into a monster that covers the whole planet, with solar attenuation that could be very bad for our vehicles. We have no way of knowing what's going to happen this year.


I think a thread about the possible effects is in order...

This page has some good info of the dust storm seasons. The peak season this year runs from July 01, 2005 (241° Ls) to August 16, 2005 (270° Ls). The good news is big bad 'global' storms are very rare so hopfully they won't be a problem anyway. (fingers crossed)

Steve mentioned that it is the loss of solar power due to the high levels of dust in the atmosphere that is the problem. I searched around for more info about how bad it could get and found this with regard to Sojourner:

QUOTE
a) Available panel power, any time during a clear-day (tau = 0.5) 6 hour period (20° N, untilted) exceeds ~11 W ( ~14.9 W at mid-day). This power could be attenuated by approximately a factor of two during severe dust storms (optical depth ~4, the worst that Viking experienced).


A factor of two loss of power wouldn't be good but that shouldn't be much worse than what Spriit had before her cleaning event, so should be survivable.

I think we'll have to be very unlucky to loose either rover to dust storms in the near future. I hope I'm right!


James
  Forum: Opportunity · Post Preview: #12506 · Replies: 17 · Views: 17892

jamescanvin
Posted on: Jun 6 2005, 01:30 AM


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QUOTE (From Steve Squyres Update)
You develop pretty strong feelings for these vehicles once you've spent enough time with them, and when one of them gets into trouble you really sweat it until the trouble is over.


I think we can all associate with that statement!

What a relef.

James
  Forum: Opportunity · Post Preview: #11895 · Replies: 171 · Views: 144352

jamescanvin
Posted on: May 31 2005, 01:59 AM


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Really incredible that sol 500 has come. I remember near the end of the primary mission being astonished that they were talking about getting to sol 250!

Lets hope there is a lot more to come.

James
  Forum: Spirit · Post Preview: #11482 · Replies: 17 · Views: 22576

jamescanvin
Posted on: May 30 2005, 03:50 AM


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QUOTE (mhoward @ May 30 2005, 12:35 PM)
Looks like a packaging error on my part. Rather than repackage it I'm posting version 1.1.1, which is better anyway. I'll make sure the Mac version works...
*


Thanks, working well now. Love the sol info window, great work.

James
  Forum: Tech, General and Imagery · Post Preview: #11404 · Replies: 945 · Views: 729981

jamescanvin
Posted on: May 30 2005, 02:01 AM


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Just downloaded 1.1 for OSX but it appears to be 1.0.9 inside the tar file.

James
  Forum: Tech, General and Imagery · Post Preview: #11399 · Replies: 945 · Views: 729981

jamescanvin
Posted on: May 24 2005, 02:19 AM


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QUOTE (mars_armer @ May 24 2005, 12:54 AM)
In the attached images, the blue position is the original "stuck" position, and the overlaid positions are after drives on sols 463-468.
*


Thanks, that is exactly what we need to see. We'll be out in no time now! smile.gif

James
  Forum: Opportunity · Post Preview: #11034 · Replies: 353 · Views: 223527

jamescanvin
Posted on: May 20 2005, 03:13 AM


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Wow ohmy.gif

I never thorght I'd see anything like that! smile.gif

James
  Forum: Mars Global Surveyor · Post Preview: #10808 · Replies: 33 · Views: 45602

jamescanvin
Posted on: May 19 2005, 12:11 AM


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QUOTE (djellison @ May 19 2005, 02:30 AM)
Using that BnW 20x20metre image they released of Oppy in its current 'situation' - and the colour self portrait from 100 sols ago or so... I made a preview of what Oppy might look like today to HiRise..
*


Wow, can't wait for the real thing smile.gif

Here's hoping that MRO doen't get to take this picture of Oppy in her current situation! unsure.gif

James
  Forum: MRO 2005 · Post Preview: #10762 · Replies: 3 · Views: 7583

jamescanvin
Posted on: May 18 2005, 02:38 AM


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QUOTE (mhoward @ May 18 2005, 12:51 AM)
QUOTE (jamescanvin @ May 17 2005, 05:09 AM)
I don't seem to be able to download the new OSX version, it apparently does not exist.

Anyone else having the same problem?

James
*


Whoops. It's fixed now.
*



Thanks, much better!

Proxy support works well (although .pac support would be nice smile.gif )

I can also confirm that MMB works well on OSX 10.4 (Tiger)

James.
  Forum: Tech, General and Imagery · Post Preview: #10675 · Replies: 945 · Views: 729981

jamescanvin
Posted on: May 17 2005, 05:09 AM


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I don't seem to be able to download the new OSX version, it apparently does not exist.

Anyone else having the same problem?

James
  Forum: Tech, General and Imagery · Post Preview: #10625 · Replies: 945 · Views: 729981

jamescanvin
Posted on: May 5 2005, 03:17 AM


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QUOTE (Myran @ May 5 2005, 12:57 PM)
I follwed the link recommended by jamescanvin and noted one patch that have caught my attention before, so I try asking here since you seem to be knowledgable people here, so here goes:

What might that that dark spot in the inner basin be, volcanic ash?
*


Oh, and just to add there is (no suprise!) a thread in this forum:

http://www.unmannedspaceflight.com/index.php?showtopic=585

That may be of more help than a lot of 'other' sites with there crazy ideas! laugh.gif wink.gif

This would also be the place to continue any discussion about it! smile.gif

James
  Forum: Spirit · Post Preview: #9969 · Replies: 663 · Views: 767520

jamescanvin
Posted on: May 5 2005, 03:09 AM


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QUOTE (Myran @ May 5 2005, 12:57 PM)
I follwed the link recommended by jamescanvin and noted one patch that have caught my attention before, so I try asking here since you seem to be knowledgable people here, so here goes:

What might that that dark spot in the inner basin be, volcanic ash?
*


Now that's a question that has been discussed WAY too much on various sites since Spirit landed! It's commonly known as the "Ultreya Abyss" do a google for lots of discussion about it

James
  Forum: Spirit · Post Preview: #9968 · Replies: 663 · Views: 767520

jamescanvin
Posted on: May 4 2005, 05:31 AM


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QUOTE (Redstone @ May 4 2005, 08:50 AM)
High resolution pictures of MRO have appeared on the KSC media archive. Click on this link and select page 3 (or find the page with pictures from May 2nd). No HGA installed yet, but I was interested to see three small thrusters on the underside of the spacecraft. See the image on this page especially. Is this triple redundancy for orbit insertion? I know Cassini had a fully redundant engine, but three seems a bit excessive.  smile.gif
*


You think three is excessive? Just wait till I tell you that there are infact six! smile.gif

See: http://marsprogram.jpl.nasa.gov/mro/mission/tl_moi.html

James
  Forum: MRO 2005 · Post Preview: #9902 · Replies: 9 · Views: 11699

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