ExoMars - Schiaparelli landing |
ExoMars - Schiaparelli landing |
Aug 12 2016, 07:07 PM
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
Starting a new topic here - hopefully that's OK! Clearly there will be a lot of action around this in the next weeks and months with descent images and HiRISE views of the hardware.
I thought I had posted this map earlier but apparently not. This shows the various landing ellipses in this area. The original plan was for an ellipse oriented NW-SE, but it changed with the different launch date and is now nearly E-W. Note that the ellipse shown in the recent ESA release is the envelope of all ellipses over a given launch period, but the actual landing ellipse for the given launch date is smaller. Opportunity's final landing ellipse is shown for comparison. http://exploration.esa.int/mars/57445-exom...6-landing-site/ http://exploration.esa.int/mars/57446-exom...6-landing-site/ Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Oct 25 2016, 06:51 AM
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#2
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Member Group: Members Posts: 149 Joined: 18-June 08 Member No.: 4216 |
Reported in Anatoly Zak's website:
"By October 24, engineers narrowed down a possible culprit to an error in the software of the Schiaparelli's Doppler radar altimeter, which misled the main computer into thinking that the spacecraft had already reached the landing altitude." That sounds like something you should catch during testing on the ground (Earth ground, that is) |
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Oct 25 2016, 09:57 AM
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#3
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
Reported in Anatoly Zak's website: "By October 24, engineers narrowed down a possible culprit to an error in the software of the Schiaparelli's Doppler radar altimeter, which misled the main computer into thinking that the spacecraft had already reached the landing altitude." That sounds like something you should catch during testing on the ground (Earth ground, that is) Maybe the radar caught the heatshield flying down in its line of sight... |
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Oct 25 2016, 10:52 AM
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#4
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Member Group: Members Posts: 149 Joined: 18-June 08 Member No.: 4216 |
Maybe the radar caught the heatshield flying down in its line of sight... It might be, but the way the sentence is phrased points to a coding issue instead. A simple unit conversion problem, for instance: alt=4km -> alt=4m. Not to suggest that this is actually the culprit, just an example. |
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