Nasa announces new rover mission to Mars in 2020 |
Nasa announces new rover mission to Mars in 2020 |
Jun 23 2020, 10:00 AM
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#331
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Newbie Group: Members Posts: 9 Joined: 27-February 12 Member No.: 6346 |
More information about the helicopter here: https://trs.jpl.nasa.gov/bitstream/handle/2...L%2317-6243.pdf Brilliant. Thanks. That answers my question. I'll take away that the landing system is fairly robust in terms of surface properties (soft/hard) but that the area for a test flight should only contain a few rocks higher than 5 cm and a general slope of up to 10 degrees. |
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Jun 23 2020, 03:15 PM
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#332
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Junior Member Group: Members Posts: 39 Joined: 9-August 12 From: London, UK Member No.: 6521 |
Getting exciting as we approach the launch date.
Just watching the final assembly of the rover and packing for the transit to Mars, along with some great detail pictures of the 'skycrane'. Was wondering if anyone had any reference to PDFs etc. on the development of this part of the EDL? And the control software? For example, was this one (or Curiosity's) system tested in any way, as per the helicopter? Or was that impractical and it was all done with simulations and component testing? Thanks for any detail:) |
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Jun 25 2020, 09:26 AM
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#333
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Junior Member Group: Members Posts: 39 Joined: 9-August 12 From: London, UK Member No.: 6521 |
Getting exciting as we approach the launch date. Just watching the final assembly of the rover and packing for the transit to Mars, along with some great detail pictures of the 'skycrane'. Was wondering if anyone had any reference to PDFs etc. on the development of this part of the EDL? And the control software? For example, was this one (or Curiosity's) system tested in any way, as per the helicopter? Or was that impractical and it was all done with simulations and component testing? Thanks for any detail:) Answering my own post here but managed to locate a few interesting PDFs about the Descent Stage for MSL/Curiosity. Not sure how much of the system has been upgraded for this mission though. |
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Jun 25 2020, 10:06 PM
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#334
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Newbie Group: Members Posts: 2 Joined: 26-May 16 Member No.: 7962 |
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Jun 26 2020, 12:02 AM
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#335
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Not sure how much of the system has been upgraded for this mission though. A good source of information is the JPL Tech Report Server at https://trs.jpl.nasa.gov . Go there and search for "skycrane". See, for example, https://trs.jpl.nasa.gov/bitstream/handle/2...L%2316-2401.pdf -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Jun 27 2020, 02:05 AM
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#336
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Member Group: Members Posts: 613 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
When I said "fluid loop" I meant "fluid loop heated by the RTG". Look at the Cassini and Galileo examples, that had big RTGs and a whole bunch of little RHUs, leaving all the RTG heat just being wasted into space. Of course fluid loops have their own problems. Technically there were fluid loops in the Cassini RTGs, but they were for cooling during ground handling - they didnt take the heat to the spacecraft. There was some exploitation of conducted/radiated heat in keeping the propulsion system a bit warm, but in fact there were shields to keep the RTGs from radiating too much heat onto the instruments. A recent example of a non-RTG non-rover pumped fluid loop is Parker Solar Probe. Dragonfly (which you could not unreasonably describe as a rover) will use a fluid loop, in the same way as Curiosity. |
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Jun 28 2020, 11:49 PM
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#337
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Member Group: Members Posts: 101 Joined: 3-May 12 From: Massachusetts, USA Member No.: 6392 |
Technically there were fluid loops in the Cassini RTGs, but they were for cooling during ground handling - they didnt take the heat to the spacecraft. There was some exploitation of conducted/radiated heat in keeping the propulsion system a bit warm, but in fact there were shields to keep the RTGs from radiating too much heat onto the instruments. For that matter, the Viking landers had a fluid loop, also primarily used during ground handling to keep the lander interior cool (each of the landers' two RTGs produced more heat in Earth's sea-level-pressure and warmish atmosphere environment than in vacuum or on the surface of Mars). The coolant loop was also used during the two-day terminal sterilization cycle when the lander was baked in a giant oven, to pump sterile hot water through the loop to heat the lander interior more quickly than would otherwise occur due to the very effective body insulation. During portions of the on-surface mission corresponding to Mars local winter, heat from the RTGs was conducted into the lander via automatic Thermal Switches. |
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Jul 2 2020, 11:20 AM
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#338
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Member Group: Members Posts: 241 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
Launch delayed to the 30th due to rocket sensor issue. They are extending the optimistic launch window to the 15th of August.
https://www.mynews13.com/fl/orlando/ap-onli...eks-left-to-fly -------------------- "Thats no moon... IT'S A TRAP!"
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Jul 22 2020, 12:53 AM
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#339
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Member Group: Members Posts: 241 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
Here is a Google Earth overlay showing the rover/drone landing site. It has a geologic overlay map and a HiRISE image covering most of the ellipse. Would do the same for Tianwen but... it's just a giant polygon over Utopia.
Attached File(s)
-------------------- "Thats no moon... IT'S A TRAP!"
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Jul 31 2020, 10:05 PM
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#340
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Member Group: Members Posts: 291 Joined: 29-December 05 From: Ottawa, ON Member No.: 624 |
I'm curious about MOXIE. It separates oxygen from the carbon in CO2. The Oxygen is released as a gas, but what form will the carbon be?
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Jul 31 2020, 10:34 PM
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#341
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
I'm curious about MOXIE. It separates oxygen from the carbon in CO2. The Oxygen is released as a gas, but what form will the carbon be? Dumped as gaseous carbon monoxide and unseparated CO2. It's worth noting that AFAIK the O2 is not actually collected, just measured to see that it existed. You could ask how useful this really is, but I'm not a chemist so my opinion doesn't count. https://www.hou.usra.edu/meetings/marsdust2017/pdf/6036.pdf -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Aug 3 2020, 05:55 PM
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#342
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Member Group: Members Posts: 102 Joined: 12-August 12 Member No.: 6540 |
Here is a Google Earth overlay showing the rover/drone landing site. It has a geologic overlay map and a HiRISE image covering most of the ellipse. Would do the same for Tianwen but... it's just a giant polygon over Utopia. Thanks for that. I wonder what route the rover will take? Here is a wild guess: W then SW until it finds a way up the escarpment: |
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Feb 20 2021, 08:46 PM
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#343
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
I found this resource on NASA's own site to be misleading:
An animation at https://mars.nasa.gov/mars2020/timeline/surface-operations/ Shows a mission traversal in which the rover climbs the fan deposit once and returns to the bottom, leaving a cache. Then it climbs on a second, similar but different route, and returns to the bottom, leaving the other cache. Other discussion here indicates that the plan is to ascend the south (from Perseverance's POV, left) side of the fan deposit, and keep going west, leaving two caches atop the plain outside the crater. If the second is correct, it's unfortunate that NASA has an animation with incorrect information featured so prominently. |
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Feb 20 2021, 10:18 PM
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#344
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
To be fair, considering that MSR mission design is still evolving it may be asking a lot to hold them to a high standard of accuracy here. Investing the time and money to update this & other EPO/PR tool every time things change before CDR (which is undoubtedly still years away) doesn't seem like a wise use of resources.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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