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Unmanned Spaceflight.com > All posts by a member| Posted on: Sep 11 2012, 05:40 PM | |
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Senior Member  Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 
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QUOTE (Skyrunner @ Sep 11 2012, 09:01 AM)  One of the portion pokers? I don't think so, based on the drawings those are both closer to the deck, larger, and outside the area covered by the belly pan. But I'm not positive. |
| Forum: MSL · Post Preview: #191163 · Replies: 252 · Views: 429901 |
| Posted on: Sep 11 2012, 04:27 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (elakdawalla @ Sep 11 2012, 09:18 AM) I would assume until proven otherwise that mcaplinger... knows what he's talking about... While I appreciate the sentiment, in this case I really don't know and skyrunner might well be right. I've never even been in the same room as MSL and I'm just speculating about what that thing is. |
| Forum: MSL · Post Preview: #191159 · Replies: 252 · Views: 429901 |
| Posted on: Sep 11 2012, 03:34 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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By the way, I presume that the skinny rod sticking out of the corner of the rover body in http://mars.jpl.nasa.gov/msl-raw-images/ms...1000E1_DXXX.jpg (at the top near the middle of the image) is one of the static discharge "lightning rods" described here: http://www.nasa.gov/centers/glenn/moonandmars/mer.html |
| Forum: MSL · Post Preview: #191151 · Replies: 252 · Views: 429901 |
| Posted on: Sep 11 2012, 03:28 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (climber @ Sep 11 2012, 07:13 AM) I guess we can see MARDI on the right hand side. Can someone confirm? Yes, you can just see the forward edge of the MARDI sunshade in the upper left corner of http://mars.jpl.nasa.gov/msl-raw-images/ms...1000E1_DXXX.jpg Nice catch, I hadn't noticed that myself. |
| Forum: MSL · Post Preview: #191149 · Replies: 252 · Views: 429901 |
| Posted on: Sep 10 2012, 02:41 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (dombili @ Sep 10 2012, 07:23 AM) there are some small black dots on the images that MAHLI has sent. Can anybody elaborate as to what they could be? They're fragments of uralane threadlock that got on the CCD microlenses and couldn't be removed. (That's the last time we use that material in that application.) I'm working on an algorithm, similar to the old vidicon reseau removal algorithm, to cosmetically remove them. |
| Forum: MSL · Post Preview: #191074 · Replies: 252 · Views: 429901 |
| Posted on: Sep 10 2012, 01:23 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (DeanM @ Sep 10 2012, 01:25 AM) GDBG appears to be some kind of Caltech fraternity... Hint: Blacker House is an undergraduate house. http://en.wikipedia.org/wiki/House_System_...e_of_Technology Other related item: here's an extreme closeup of the MMM focal plane board, on the opposite side from the CCD:  I didn't go to Caltech so I only look on these things with bemusement. |
| Forum: MSL · Post Preview: #191069 · Replies: 252 · Views: 429901 |
| Posted on: Sep 10 2012, 04:34 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (PDP8E @ Sep 9 2012, 09:28 PM) MAHLI has tossed off its lens cover! That image was down and noted a couple of pages upthread. MAHLI data release is same day. |
| Forum: MSL · Post Preview: #191045 · Replies: 252 · Views: 429901 |
| Posted on: Sep 10 2012, 04:03 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Hungry4info @ Sep 9 2012, 08:45 PM) I figure this is either a moon or an LED. The sun, actually. |
| Forum: MSL · Post Preview: #191040 · Replies: 252 · Views: 429901 |
| Posted on: Sep 9 2012, 04:14 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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Many of sol 32's Mastcam turret inspection images are up also. http://mars.jpl.nasa.gov/msl-raw-images/ms...0000E1_DXXX.jpg |
| Forum: MSL · Post Preview: #190968 · Replies: 252 · Views: 429901 |
| Posted on: Sep 8 2012, 03:29 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Ant103 @ Sep 8 2012, 07:53 AM) This self-portrait pic, it's an amazing shot ! Thanks. Note on terminology: this isn't what we call the self-portrait. That's a multi-image mosaic of the whole rover taken with MAHLI, still in the planning process. This image is usually nicknamed for a Pixar character that visually looked something like the RSM.  |
| Forum: MSL · Post Preview: #190935 · Replies: 252 · Views: 429901 |
| Posted on: Sep 8 2012, 02:32 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Doc @ Sep 8 2012, 04:16 AM) Why would they need the LEDs in this case? To verify they were working. It also gives us some data on the dust loading on the cover. |
| Forum: MSL · Post Preview: #190931 · Replies: 252 · Views: 429901 |
| Posted on: Sep 7 2012, 02:10 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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Re Stardust: good reference on that in http://www.spaceops2012.org/proceedings/do...5-Paper-001.pdf |
| Forum: Exploration Strategy · Post Preview: #190820 · Replies: 19 · Views: 35631 |
| Posted on: Sep 7 2012, 01:24 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Doug M. @ Sep 7 2012, 12:44 AM) The range of uncertainty is almost half the total amount of fuel. I wonder why... The amount of remaining propellant is only known by keeping track of the measured delta-V of all maneuvers and assuming a relationship between delta-V and used propellant mass, but that relationship is variable and imperfectly known. Most ways of narrowing this down would involve using more fuel, which is clearly not a great idea. A google search for "spacecraft fuel remaining estimate" turned up an interesting paper about various methods of determining remaining propellant, but most require special hardware that Odyssey doesn't have. Bookkeeping is usually good enough. http://yspm.net/pdf/11_AnikE.pdf Also, the usage rate is quite variable depending on torques, atmospheric density, solar activity, etc. |
| Forum: Exploration Strategy · Post Preview: #190816 · Replies: 19 · Views: 35631 |
| Posted on: Sep 6 2012, 05:38 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Doc @ Sep 6 2012, 10:25 AM) sol 33 seems to be the day for a MAHLI self-portrait(?) Depends on what you mean by self-portrait, but the belly pan is not what we think of as the self-portrait, nor do we call it the "MAHLI self-portrait" because it's not a self-portrait of MAHLI, but with MAHLI. Some people call the self-portrait of the rover taken with MAHLI the "Myspace image" but I'm too old to know what that means.  |
| Forum: MSL · Post Preview: #190743 · Replies: 252 · Views: 429901 |
| Posted on: Sep 6 2012, 03:49 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (john_s @ Sep 5 2012, 06:14 PM) Interesting number- "150 m" is about the size of the impact debris field... Right, but the debris is all in the forward scattering 180 degrees. The chance of something bouncing straight back would seem to be remote. Of course, I don't know how the descent stage engineers feel about the size of the debris field. http://www.engr.utexas.edu/features/marsskycrane QUOTE After the landing, it was confirmed that the flight distance was about 650 meters (more than 2,000 feet), which was way beyond our minimum flight distance requirement. |
| Forum: MSL · Post Preview: #190725 · Replies: 199 · Views: 178815 |
| Posted on: Sep 5 2012, 11:39 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Kaputnik @ Sep 5 2012, 03:55 PM) Probably going over old ground here, but my understanding is that the descent stage, once cut free, had no 'brain' as such... [This discussion is in the wrong thread.] See page 19 of http://trs-new.jpl.nasa.gov/dspace/bitstre...0/1/11-1328.pdf QUOTE Fly Away Segment. After touchdown is declared, transition to flyaway begins. Flyaway is performed using the flyaway controller executing on the descent stage processor (SPARC) in the Descent Motor Control Assembly (DMCA) on the descent stage. The following events occur after touchdown is declared: 1. Descent stage slows down to 0 m/s. 2. Controlled [sic] transferred from Rover Compute Element (RCE) to DMCA. 3. Bridle and electrical umbilical are cut. Once the bridle and electrical umbilical are cut, the flyaway controller exhibits three phases: 1. Hover – Used for the period of time required to cut the electrical umbilical between the rover and the descent stage. 2. Ascent – To maintain MLE plume ground pressure below landing pressure, the descent stage trav- els straight up. 3. Turn and Burn – Two of the MLE engines are brought to 100% while the other two engines are at slightly less than 100%, causing the descent stage to pitch about the descent stage Y-axis to 45°. Once the turn duration is complete, all four engines are brought to 100% with the controller mak- ing adjustments for maintaining zero attitude rates. Constant thrust is applied for enough time to ensure that the descent stage will impact the surface at least 150 m from the rover’s position. |
| Forum: MSL · Post Preview: #190679 · Replies: 199 · Views: 178815 |
| Posted on: Sep 5 2012, 02:39 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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I played with it some more and was unable to duplicate your results. There may be some subtlety with the order of the images or something. I'm also a bit confused about how the cropping works in hugin. If I were doing it I would pre-crop the images before hugin even sees them, just to be sure. Expecting it to sensibly handle the vignetted crap near/beyond the filter boundary is asking too much. Sorry I can't be of more help, I'm no hugin expert. |
| Forum: Image Processing Techniques · Post Preview: #190631 · Replies: 7 · Views: 8264 |
| Posted on: Sep 5 2012, 04:20 AM | ||
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (elakdawalla @ Sep 4 2012, 08:55 PM) Thanks for any help you can provide. The version of hugin in the Ubuntu 10.04 distribution (Version 2009.2.0.4461), using autopano-sift for registration and with default settings for blending, worked pretty well in fully automatic mode. I just tell it the horizontal FOV is 5 degrees. With these full-frame images I would cut off the 100-200 pixels on the left and right so the massive vignetting doesn't confuse things (I usually shoot 1200x1200 images for mosaics but not everyone listens to me  ) You can see some corner artifacts but not as bad as what you were getting.
BTW, I'm not sure how hugin/autopano-sift works, but when autostitch works, it's a lot faster and easier for casual use. Hugin's output image quality is better, though. |
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| Forum: Image Processing Techniques · Post Preview: #190606 · Replies: 7 · Views: 8264 |
| Posted on: Sep 4 2012, 09:53 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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IMHO it's too early to say how often big mosaics will be taken. Mastcam can take color in a third the images of MER and it takes at least 10x less time to take a mosaic because the cameras are faster. And MSL should be able to return many times the data volume of MER. Balanced against that is the desire to target 100mm images of specific targets. We'll see how useful the narrowband filters are; if they prove valuable then that's another data consumer. And how often do you really want a full mosaic anyway, the scenery doesn't change that fast. Though it would be nice to get a pretty 360 including the deck. Anyway, they don't let me push the button so my opinion isn't worth much. |
| Forum: MSL · Post Preview: #190565 · Replies: 313 · Views: 278336 |
| Posted on: Sep 3 2012, 06:19 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Astro0 @ Sep 2 2012, 05:40 AM) Remember that NASA makes arrangements with 'education partners' when they do these sorts of things (eg: Lego/MER). For them, it's about the mission. Hmm. In the case of Pathfinder and Galileo, this was a deal between JPL (not NASA, per se) and Mattel. See http://www.jpl.nasa.gov/news/releases/97/workshop.html and http://articles.latimes.com/1998/oct/05/news/ls-29380 QUOTE Mattel will not release sales figures, and JPL will not disclose its share of the profits. At least the Pathfinder and Galileo (and MPL) models were fairly accurate. The MSL one, not so much. As a modeler from an early age, I'm pretty concerned that the profit motive of the big aerospace companies and licensing fees will severely impact the hobby. I'm not sure that JPL is much better. |
| Forum: MSL · Post Preview: #190449 · Replies: 12 · Views: 24732 |
| Posted on: Sep 2 2012, 04:39 PM | ||
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (fredk @ Sep 2 2012, 08:03 AM) I guess MARDI was coated pretty heavily in dust during landing... That seems inevitable, but nowhere near as bad as the MAHLI transparent cover. The MARDI images stretch quite nicely.
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| Forum: MSL · Post Preview: #190435 · Replies: 313 · Views: 278336 |
| Posted on: Sep 1 2012, 11:35 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (charleski @ Sep 1 2012, 03:45 PM) The KAI-2020 sensor only has 60dB of dynamic range at full resolution... That's at 40 MHz, though, and we aren't running that fast. I'd say we're getting more like 65 dB, almost twice as good. Also, remember that the images are square-root-encoded, so you can't just look at the straight histograms and compute the bit range. We'll see about HDR. I tend to think it's a bit overhyped, but I'd be willing to be proven wrong. |
| Forum: MSL · Post Preview: #190404 · Replies: 313 · Views: 278336 |
| Posted on: Aug 31 2012, 09:35 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (marsophile @ Aug 30 2012, 01:42 PM) The humidity sensor is on Boom 2, the damaged boom. Does that mean the humidity sensor is non-operational? I had the impression that the wind sensors were more fragile than the humidity sensor. http://cab.inta-csic.es/rems/rems_instrument.html I don't know, but I'd be surprised if the humidity sensor was damaged. |
| Forum: MSL · Post Preview: #190368 · Replies: 307 · Views: 455647 |
| Posted on: Aug 30 2012, 03:29 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (centsworth_II @ Aug 30 2012, 07:44 AM) So possibly the descent stage eclipsed the sun just before crashing? I can't rule that out, but I don't really know what the trajectory of the descent stage was. You'd think you'd want to go straight up for a while before tilting over, and the sun was low. |
| Forum: MSL · Post Preview: #190286 · Replies: 370 · Views: 290187 |
| Posted on: Aug 30 2012, 03:25 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Airbag @ Aug 30 2012, 07:51 AM) I created a plot of that for the available full frames post-wheels down... I saw that, but a subframe of just the sunlit strip is maybe less ambiguous since there's a lot of scattering in the shadows. |
| Forum: MSL · Post Preview: #190285 · Replies: 370 · Views: 290187 |
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