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[NASA] Curiosity Blog, Sols 4825-4831: Exploring the Borderlands

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Curiosity Blog, Sols 4825-4831: Exploring the Borderlands

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NASA’s Mars rover Curiosity acquired this image of a pitted vertical rock face dubbed “Timboy Chaco,” using its Mars Hand Lens Imager (MAHLI), located on the turret at the end of the rover’s robotic arm. MAHLI uses an onboard process to merge multiple images of the same target, making a composite that brings as many features as possible into focus. Curiosity performed the merge on March 5, 2026 — Sol 4827, or Martian day 4,827 of the Mars Science Laboratory Mission — at 19:56:40 UTC.
NASA/JPL-Caltech/MSSS

Written by William Farrand, Senior Research Scientist, Space Science Institute

Earth planning date: Friday, March 6, 2026

Curiosity is in the last stage of its exploration of the spiderweb-like boxwork unit. This stage consists of exploring the eastern and southern borders of this terrain. There were two multi-sol plans assembled this week. The previous plan put Curiosity at a site on the eastern extent of the boxwork unit with bedrock that allowed for brushing and in-place measurements with APXS and MAHLI of the bedrock target “Infiernillo.” The ChemCam also took a LIBS chemical measurement of this target as well as a nodular-rich piece of bedrock assigned the name “Humahuaca.” MAHLI was tasked to image a pitted vertical rock face which was dubbed “Timboy Chaco” (part of which is shown in the MAHLI color image accompanying this report). Mastcam color mosaics and ChemCam Remote Micro-Imager (RMI) mosaics were also collected to characterize nearby terrain including a butte to the south and the geologic contact between the boxwork terrain and the adjacent layered, light-toned unit.

A midweek drive put the rover even closer to the eastern edge of the boxwork unit and set it up for two or more drives to the southern edge of the boxwork. The workspace present for Friday planning included bedrock exposures and a dark-toned float rock. The float rock was large enough for in-situ observation by APXS, and it was also targeted for up-close imaging by MAHLI and a measurement by ChemCam to observe its reflectance properties. Some other dark float rocks observed by Curiosity in the past year have been hypothesized as being stony meteorites (chondrites). Measuring the chemistry and reflectance of this dark rock, named “Thola,” will allow the team to determine if it is native to Mars or a meteorite from beyond. The Friday plan also included ChemCam remote chemistry measurements of the smooth bedrock target “Valle Fertil” and a nodular bedrock target “Norte Grande.” The plan also included Mastcam mosaics of light-toned bedrock across the eastern contact of the boxwork unit to assess sedimentary structures and determine stratigraphic relationships, observations of smaller troughs in the regolith, and other mosaics of nearby ridges as well as a two-frame mosaic of the dark float rock Thola and another dark-toned pebble.

The plan concludes with a drive toward the southern border of the boxwork unit. Given that this southern contact is approximately 100 meters (about 109 yards) away, it will likely require two drives.

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NASA’s Curiosity rover at the base of Mount Sharp
NASA/JPL-Caltech/MSSS

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Mar 11, 2026

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