My Assistant
| Posted on: Feb 28 2021, 12:59 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Eh, it's a large flat shiny white rock, Looks the same as all the other rocks around to be honest - it just happens to be in the direction of the sun at 2-4pm in the afternoon and so is getting some glinting going on when it's photographed. Take the images about 5 hours earlier and I'd bet we be remarking just how 'shiny' this pile of rocks is https://mars.nasa.gov/mars2020-raw-images/p...6_110085J01.png |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250371 · Replies: 477 · Views: 263318 |
| Posted on: Feb 28 2021, 12:30 AM | ||
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
This is the best I could do with the Sol 3 Mastcam Z images of the foreground. https://sketchfab.com/3d-models/m2020-landi...7c685f31cf97c30 |
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| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250370 · Replies: 477 · Views: 263318 |
| Posted on: Feb 28 2021, 12:28 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
The entire sequence ( ncam00598 ) started at 18:34:56 LMST and finished at 19:25:36 LMST Sunset based on local topography was 18:23 LMST |
| Forum: MSL · Post Preview: #250369 · Replies: 990 · Views: 555597 |
| Posted on: Feb 26 2021, 05:45 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Ahh ok - they miss spoke at yesterdays thing then. This matches MSL Mastcam Left then |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250312 · Replies: 178 · Views: 141331 |
| Posted on: Feb 26 2021, 05:30 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Jim has put out a Mastcam-Z filename decode guide https://mastcamz.asu.edu/decoding-the-raw-p...mage-filenames/ It includes digits in there that describe the focal length in mm as three digits. All the stereo pan images report 34mm for that - which matches |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250310 · Replies: 178 · Views: 141331 |
| Posted on: Feb 26 2021, 04:37 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
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| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250296 · Replies: 477 · Views: 263318 |
| Posted on: Feb 25 2021, 04:17 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
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| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250261 · Replies: 477 · Views: 263318 |
| Posted on: Feb 25 2021, 02:04 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
It's not great - but this is my agisoft metashape results with the Navcam images so far https://sketchfab.com/3d-models/m2020-landi...7215aa7db2fb0c8 |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250249 · Replies: 178 · Views: 141331 |
| Posted on: Feb 24 2021, 08:34 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
So, it's the backshell then? No - the backshell isn't in that direction. Here is the basemap ( https://mars.nasa.gov/mars2020/mission/where-is-the-rover/ ) with hardware image ( https://www.uahirise.org/releases/persevera...ware-labels.jpg ) reprojected on to it. There is no hardware south of that distant mesa. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250206 · Replies: 477 · Views: 263318 |
| Posted on: Feb 24 2021, 03:38 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Turned on just before chute deploy - but behind the cover that comes off at deployment, hence some black frames at the start of the sequence |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250193 · Replies: 122 · Views: 103950 |
| Posted on: Feb 23 2021, 08:39 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
For the less technically minded among us...Ryan Kinnet has put up a page that grabs a listing with links to the PNG files that you can then use any browser-plugin-batch-downloader with https://twitter.com/rover_18/status/1364309922167488512 I tried Firefox with 'DownloadThemAll' and it worked perfectly. Meanwhile THIS GUY has python code to also grab the data https://twitter.com/kevinmgill/status/1364311336000258048 |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250146 · Replies: 178 · Views: 141331 |
| Posted on: Feb 23 2021, 06:16 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
I'm not sure what product you're trying to make that isn't put into the PDS with a large code base and expansive documentation in a few months time, just like HiRISE etc. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250139 · Replies: 477 · Views: 263318 |
| Posted on: Feb 23 2021, 05:04 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Easy test - go find the location in this map. If it's in this map - it's pre-EDL - it's just natural. You don't mean this by any chance? This is pre-landing. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250138 · Replies: 424 · Views: 308692 |
| Posted on: Feb 23 2021, 03:35 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
like we have with MSL, but unfortunately that has to go through JPL MIPL which is apparently very secretive. JPL really is conservative when it comes to releasing their code. There are reasons to be critical about how things have gone in terms of getting data out to the public over the past few days. But this is absolutely untrue. Those mosaics from Curiosity are auto-generated after images are received after every drive, and every time there are updated images to add to them. They get sent out to the MSL internal server, a thumbnail gets emailed out to the team, and it gets uploaded to the MSL public website all using the same end-of-pass script. https://mars.nasa.gov/msl/multimedia/mosaics/ . This is not ‘very secretive’. It’s about as proactively open as it’s possible to be. It happens entirely hands off - no human in the loop - automatically. If I have been on shift sequencing images ...that public website is the place I go to see the end result first thing in the morning. I would expect that M2020 will probably get to the same point in the near future. MIPL isn’t secretive. They have posters and presentations about their work at almost every planetary science conference I’ve seen. See https://trs.jpl.nasa.gov/handle/2014/42355 for example. As for ‘conservative when it comes to releasing their code’ - most of the MIPL code base is open source https://www-mipl.jpl.nasa.gov/vicar_open.html |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250133 · Replies: 477 · Views: 263318 |
| Posted on: Feb 22 2021, 12:50 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
I genuinely have no insider info for M2020 ECAM stuff - I'm guessing like everyone else - but it would appear.... Mars_Perseverance_RLB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01 Mars_Perseverance_RLG_0002_0667129481_373ECM_N0010052AUT_04096_00_2I3J01 Mars_Perseverance_RLR_0002_0667129466_057ECM_N0010052AUT_04096_00_2I3J01 Stack to an RGB image...... RLB being the Blue, RLG being the Green etc etc Images like Mars_Perseverance_FRE_0000_0666958359_772ECM_N0010052AUT_04096_00_0LLJ01 - the E is raw and needs to be debayered ( I used Fitswork ) |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250008 · Replies: 477 · Views: 263318 |
| Posted on: Feb 22 2021, 12:48 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
Re. the front Hazcams: is "A" the outboard of each L/R pair and "B" inboard? A is the pair connected to the A flight computer, and B is the pair connected to the B flight computer Image from https://link.springer.com/article/10.1007/s11214-020-00765-9 |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #250007 · Replies: 477 · Views: 263318 |
| Posted on: Feb 21 2021, 08:46 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
the sky crane engines are run at full throttle until the fuel depletes Sorry to belabor this point - but they are not. I asked the EDL Phase lead. I refer you again to this paper : https://ieeexplore.ieee.org/stamp/stamp.jsp...rnumber=8742167 |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249987 · Replies: 122 · Views: 103950 |
| Posted on: Feb 20 2021, 12:43 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
There must be good reason why an emptied fuel tank poses enough an explosion hazard they take measures to avoid, but seems counterintuitive, any explanation? Yup - the 'eyes' caption is just flat out wrong - I've let them know. As you run out of fuel you can get a mix of fuel and pressurizing gas coming through the pipelines together and bad things can happen. tl;dr don't run a rocket dry. Bad things happen. Shut the engines down after they've done all they need to and the problem goes away. Moreover - the longer you run those engines, the longer you need to maintain attitude to keep firing in a good direction - away from the rover. As the paper I cited earlier details - that's not trivial. 6 seconds is enough. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249911 · Replies: 477 · Views: 263318 |
| Posted on: Feb 19 2021, 10:10 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
I think the full frame is actually the whole frame from Front Left - and the wheel subframe is from the Front Right. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249894 · Replies: 477 · Views: 263318 |
| Posted on: Feb 19 2021, 09:30 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
It burns its fuel until depletion It does not do this. See Mars Science Laboratory Flyaway Guidance, Navigation, and Control System Design. Behçet Açıkmeşe et.al. The bridle umbilical device (BUD) has built-in retraction springs to retract the now free bridles away from the rover top deck. Once the flyaway controller on the DS assumes control, it first holds the current altitude for 600 ms to allow sufficient time for the umbilical to be cut. After the requisite hold time, the thrusters throttle up and the DS ascends vertically for a predetermined amount of time. Then, the DS begins to execute a turn to approximately 50 deg pitch. The DS holds this attitude with the thrusters at 60% for 4 s. The hold, ascent, and turn take place within 2 s, which corresponds to a total flyaway time of 6 s There is fuel and high pressure gas still onboard when this is finished. Flyaway consumes ~20-22kg of fuel. M2020 had ~90kg of fuel remaining so there were ~70kg of fuel left on the descent stage at burnout. To burn to depletion would be to risk an explosive event at fuel exhaustion causing a debris field the rover would be well within. https://static.uahirise.org/images/2012/det...028401_1755.jpg < The crime scene of the MSL descent stage impact. Note the explosive nature of the scar. The descent stage doesn't have a proper flight computer. It doesn't have it's own communications. It doesn't have it's own power generation. It doesn't have its own instruments. It doesn't have landing gear. It doesn't have enough fuel to land anyway. This is a big discussion we all had in this place 8+ years ago. The descent stage is not a missed opportunity for a lander. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249891 · Replies: 477 · Views: 263318 |
| Posted on: Feb 18 2021, 03:49 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
That's not a map of the surface - that's a map of a plan through deep space. The spacecraft actively flies its way through entry to target the center of the ellipse. You can't translate that entry mapping image onto a surface map. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249642 · Replies: 75 · Views: 93860 |
| Posted on: Feb 18 2021, 02:50 AM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
MRO will be doing bent-pipe realtime relay ( which is a new feature on MRO thanks to a software update ) MAVEN will be doing canister mode recording for later return to Earth. See pages 23 and 43 of the Landing Press Kit https://www.jpl.nasa.gov/news/press_kits/ma...g_press_kit.pdf |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249640 · Replies: 75 · Views: 93860 |
| Posted on: Feb 15 2021, 11:46 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
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| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249603 · Replies: 75 · Views: 93860 |
| Posted on: Feb 15 2021, 08:53 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
You can thank the Presidents Day holiday for the extra sol of downlink to spend on a full frame upper tier 5x1 |
| Forum: MSL · Post Preview: #249597 · Replies: 990 · Views: 555597 |
| Posted on: Feb 15 2021, 05:18 PM | |
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14457 Joined: 8-February 04 Member No.: 1 |
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| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249591 · Replies: 33 · Views: 34144 |
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