130 likes | 256 Views
Fine-layered Meridiani crater for the MSL Landing Site. L. V. Posiolova, K. S. Edgett , and M. C. Malin Malin Space Science Systems.
E N D
Fine-layered Meridiani crater forthe MSL Landing Site L. V. Posiolova, K. S. Edgett , and M. C. Malin Malin Space Science Systems
Landing in northern Sinus Meridiani provides access to great diversity of light-toned, layered rock;the rocks here are lower in the stratigraphic column than at MER-B site. 8.6 N 9.0 W Source: Northwest Sinus Meridiani geologic sketch map by Edgett (2005, Mars, 1, 5–58). 4.5 S 352.5 W
Landing in northern Sinus Meridiani provides access to great diversity of light-toned, layered rock;the rocks here are lower in the stratigraphic column than at MER-B site. 8.6 N 9.0 W This site This site Source: Northwest Sinus Meridiani geologic sketch map by Edgett (2005, Mars, 1, 5–58).
6.4 N 2.5 W Site Location and Topography: • Site is located in northern Sinus Meridiani • - near 5.5 N, 2.0 W (358.1 E) ~500km NE of MER-B • 9-km wide elliptical depression with finely layered deposits • Located ~1.5km below the martian datum surrounded by relatively flat area 5.1 N 1.6 W
Why are we proposing this site: • Hypothesis - candidate for a small lake; lakes were once present on Mars • Layered sedimentary rock • Broad, banded repeated layers in this crater, different from the other sedimentary rocks in the area • Fine layering, requires a persistent aqueous setting during part of its history • Lacustrine sediments can provide a record of a habitable site • Localized character - plus and minus • Surrounded by other outcrops providing additional sites for the extended mission
Layers in this crater don’t exhibit severe stairstep pattern topogaphy as many other sedimentary rock sites do
A B A B • Smooth areas for landing and driving • Images are approximately from centers of ellipses 1 km R04-02122 S18-00278
Compare with terrains in landing ellipses for Opportunity in Meridiani (on the left) and Spirit in Gusev Crater (on the right) R02-00715 1 km E05-02645
R16-01694 Portion of V04756006 Possible Driving Route • THEMIS and MOC images showing possible driving route and an entry into the crater Portion of V05867017
Landing Site requirements: • It is a “go-to” site • Surrounding topography suggest relatively flat surface for a safe landing • At least two 20 km diameter ellipses can fit near the crater • From the orbiter do not see presence of large boulders • Site and ellipses ~1.5 km below martian datum
A B
Summary: • Testing Hypothesis - small crater lake in Sinus Meridiani • Subaquaous environment have high potential for past habitability; localized environment make easier for materials to concentrate • Stratigraphically this site is located lower then MER-B, so landing here will help to reconstruct the extended geological history of this portion of Mars • Surrounded by other outcrops providing additional sites for the extended mission • This site is equatorial, at an elevation ~–1.5 km surrondined by safe/flat areas for landing