ExoMars - Schiaparelli landing |
ExoMars - Schiaparelli landing |
Aug 12 2016, 07:07 PM
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Solar System Cartographer Group: Members Posts: 10184 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 PD: 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 24 2016, 05:19 PM
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Martian Photographer Group: Members Posts: 352 Joined: 3-March 05 Member No.: 183 |
The images were taken with fixed exposure times to minimize a streak. The contrast was expected to be low, even in the unlikely event the lander came to a part of the sky where Opportunity had a line of sight. So, spreading the sub-pixel feature over lots of pixels would just further reduce it.
The few red images were to mitigate against model error or tau change--the contrast was predicted to go through 0 within the Pancam bandpass. But they were few due to bits and to image timing. Pancam is slow; slower still in the rover's current operational mode. Tests ahead of time struggled to demonstrate a way to go fast--generally, when the images have gone fast, subframes were used. So, after the first 5 images (4 L, 1 R), there was no chance. I was expecting ~6 L images, and was betting the descent would be a little later and farther downrange (not having a better option--imaging from inside the crater was like looking for your keys under the streetlight, even if you thought you might have dropped them off in the dark spot off to the left). |
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