Stephane NOct 20

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Show threadPhil StookeJul 1, 2025

Wait - hematite? Haven't I been saying that composition was not available? It was just coming now, at low resolution, from Mars Global Surveyor's Thermal Emission Spectrometer. The background images in this map are from Mars Odyssey's THEMIS infrared instrument. Dark areas are warmed more by the Sun and are bright in THEMIS daytime images, but I have inverted the shading so dark areas look dark.

Tomorrow - Wobble! What if anything am I talking about?

#mars #mars2001

Show threadPhil StookeJul 1, 2025

All that work brought the Mars Surveyor 2001 mission to the point of drawing up a shortlist of preferred sites. But Mars Polar Lander crashed in 1999 and our plucky lander was cancelled. A few years later it was taken out of storage and used successfully for Phoenix. InSight was also the same design.

The shortlist of 8 sites had 2 in Meridiani and 4 in Isidis. The hematite site is close to Opportunity's location.
#maps #mars #mars2001

Show threadPhil StookeJun 30, 2025
A few more of the Mars Surveyor 2001 sites. Ellipses, circles, points - the different styles are just copied from the sources, abstracts for the workshop. Only site 58 (800 km east of Gale crater) had a traverse map. It's only a possible example because it would depend on the exact landing site, which could not be predicted. That's like Spirit and Opportunity, traverse planning only started when the team knew where they landed. Next: the shortlist.
#maps #mars #mars2001
Show threadPhil StookeJun 29, 2025
Below the map of Farmer's sites are examples of sites drawn from the larger set mapped 2 days ago for the downsized mission. I won't show all of them. Of particular note here are sites in Meridiani near Opportunity's later landing site. Because the traverse would be so short these sites don't come with routes. Only one site was shown with a rover route (we'll see it tomorrow). For scale, 1 degree of latitude is c. 60 km, a handy thing to remember.
#mars #mars2001
Show threadPhil StookeJun 29, 2025
The maps of all 2001 sites posted 2 days ago covered 2 workshops, the top for the first version of Mars Surveyor 2001 with a big rover, the bottom for the version with a small rover. A small rover implied a short traverse, 1000 m maximum, so sites which could be studied in a compact area were chosen for the second set. A subset of those sites were chosen by Jack Farmer (Arizona State University) et al. for astrobiology. The top map shows Farmer's sites.
#maps #mars #mars2001
Show threadPhil StookeJun 28, 2025
That site in Gusev was not the only current site in that old list. Gale crater was another, though no traverse was illustrated. There was no compositional data to identify the hematite on Vera Rubin Ridge, or the clay in Glen Torridon, so a traverse like Curiosity's would not be likely. Jezero was not on the list, and Mars Global Surveyor MOC images had not yet revealed its delta, but they would soon. Here are a few more sites to ponder.
#maps #mars #mars2001
Show threadPhil StookeJun 27, 2025
A few of the many sites for Mars Surveyor 2001 were given suggested traverses for the mission's big rover (before it was downsized). Traverses are typically about 40 km long, about the scale we are seeing today for our big rovers. They are shown here with some geological annotation. The Thira crater lake site (41 on yesterday's map) might not sound familiar, but Thira is a small crater inside Gusev, its rim visible to the Spirit rover from the top of Husband Hill.
#maps #mars #mars2001
Show threadPhil StookeJun 26, 2025
This map shows the many sites considered at the 2 workshops. The top 2 maps are for the big rover, the bottom 2 maps for the little one. That's a lot of sites! Site selection was now making use of high resolution images and topography from Mars Global Surveyor (both much better than Viking data) and even the Termoscan infrared instrument on Phobos 2. We will see some possible rover traverses tomorrow.
#maps #mars #mars2001
Show threadPhil StookeJun 26, 2025
We skipped Mars Pathfinder and Mars Polar Lander because they actually happened (though MPL crashed), so the next mission which did not happen was Mars Surveyor 2001. Its goal was to explore a site with a record of past water or even life, using a large rover. Soon it was downsized and would have carried a little rover called Marie Curie, similar to Sojourner. One workshop in 1998 looked at sites for the big rover, and another in 1999 looked at sites for Marie Curie.
#mars #mars2001 #mariecurie