Curiosity Blog, Sols 4607-4608: Deep Dip

Written by Deborah Padgett, MSL OPGS Task Lead at NASA's Jet Propulsion Laboratory

Earth planning date: Monday, July 21, 2025

Curiosity continues our exploration of the fractured boxwork terrain on the slopes of Mount Sharp. After a successful 5-meter drive (about 16 feet), our rover is resting in a hollow on its way to a boxwork ridge viewpoint. Over the weekend, Curiosity began an atmospheric observation with the SAM instrument, which will continue into today's plan. Because the SAM instrument is complex and powerful, it uses a great deal of energy when it operates, causing what we call a "deep dip" in the battery charge level. This means that we have to wait a bit after the SAM observations complete for the battery to recharge enough for Curiosity to observe its surroundings with other science instruments, or move its arm or wheels. For this reason, the plan today does not include a drive, and contact science at this location will be done on the second sol of the plan.

On Sol 4607, Curiosity will begin the day with SAM atmospheric composition activity, which will run for several hours. After it finishes, we will use the rover's navigation camera to perform a cloud altitude observation, looking for cloud shadows on the upper reaches of Mount Sharp, and clouds drifting by overhead at the zenith. Overnight, Curiosity's battery will recharge, allowing us to perform a targeted science block on the morning of Sol 4608. This starts with Navcam observations of dust opacity across the floor of Gale Crater, then a measurement of dust in the air toward the Sun with Mastcam. Curiosity then turns Mastcam toward the ridge ahead to obtain a 15×1 mosaic on target "Cueva De Los Vencejos Y Murcielagos (Cave of Swifts and Bats)." Afterwards, Mastcam will look back along Curiosity's tracks, hoping to see freshly broken rocks and determine the texture of disturbed ground. Next, ChemCam's laser spectrograph will zap a nodular rock pillar named for the famous high-altitude "Lake Titicaca" bordering Bolivia and Peru. A second ChemCam observation with the RMI telescopic camera will study stratigraphy on the Mishe Mokwa butte with a 5×2 image mosaic. Mastcam will finish off this science block by looking at the pits left behind by the ChemCam laser on target "Lake Titicaca."

In the afternoon, Curiosity's arm will reach out to brush the dust from the bedrock target "La Tranquita," then observe it with the MAHLI microscopic imager and APXS. MAHLI and APXS will also investigate plate-like rock formations at target "Aqua Dulce." A third target with more complex rock structures dubbed "Paposo," after a natural monument along the Pacific Coast of northern Chile, will be imaged only by MAHLI. The next morning will include another targeted science block. Curiosity will then drive away toward the next viewpoint in the boxwork terrain of Mars.