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Sols 4445–4446: Cloudy Days are Here
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Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions 2 min read
Sols 4458-4460: Winter Schminter
NASA’s Mars rover Curiosity captured this image of the Texoli butte, a Martian landmark about 525 feet (160 meters) tall, with many layers that scientists are studying to learn more about the formation of this region of the Red Planet. The butte is on the 3-mile-high Mount Sharp, inside Gale Crater, where Curiosity landed and has been exploring since 2012. The rover acquired this image using its Left Navigation Camera on sol 4456, or Martian day 4,456 of the Mars Science Laboratory mission, on Feb. 17, 2025, at 17:51:56 UTC. NASA/JPL-Caltech Earth planning date: Tuesday, Feb. 18, 2025
During today’s unusual-for-MSL Tuesday planning day (because of the U.S. holiday on Monday), we planned activities under new winter heating constraints. Operating Curiosity on Mars requires attention to a number of factors — power, data volume, terrain roughness, temperature — that affect rover operability and safety. Winter means more heating to warm up the gears and mechanisms within the rover and the instruments, but energy that goes to heating means less energy for science observations. Nevertheless, we (and Curiosity) were up to the task of balancing heating and science, and planned enough observations to warm the science team’s hearts.
We fit in DRT, APXS, and MAHLI on two different bedrock targets, “Chumash Trail” and “Wheeler Gorge,” which have different fracturing and layering features. In the workspace, ChemCam targeted a clean vertical exposure of layered bedrock at “Sierra Madre” and a lumpy-looking patch of resistant nodules at “Chiquito Basin.”
The topography of the local terrain and our end-of-drive position after the weekend fortuitously lined up to give us a view of an exposure of the Marker Band, which we first explored on the other side of Gediz Vallis Ridge. Having a view of another exposure of this distinctive horizon helps give us further insight into its origin, so we included both RMI and Mastcam mosaics of the exposure.
Documenting a feature that, unlike the Marker Band, has been and will be in our sights for a long time — “Texoli” butte (pictured above) — was the goal of additional Mastcam and ChemCam imaging. Observations of potential sedimentary structures on the flank of Texoli motivated acquisition of an RMI mosaic, and a chance to capture structures along its southeast face inspired a Mastcam mosaic. Good exposures of additional nearby bedrock structures at “Mount Lukens” and “Chantry Flat” drew the eye of Mastcam, while another small mosaic focused on the kind of linear troughs in the sand we often see bordering bedrock slabs. Environmental observations included Navcam cloud and dust-devil movies, Mastcam observations of dust in the atmosphere, and REMS and RAD measurements spread across the three sols of the plan.
Written by Michelle Minitti, Planetary Geologist at Framework
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Last Updated Feb 20, 2025 Related Terms
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Sols 4454-4457: Getting Ready to Fill the Long Weekend with Science
NASA’s Mars rover Curiosity acquired this image, which includes the pyramid-shaped rock at left in the photo, the science target dubbed “Pyramid Lake,” using its Left Navigation Camera. The rover acquired the image on sol 4452, or Martian day 4,452 of the Mars Science Laboratory mission, on Feb. 13, 2025, at 14:22:06 UTC. NASA/JPL-Caltech Earth planning date: Friday, Feb. 14, 2025
Curiosity is continuing to make progress along the strategic route, traversing laterally across the sulfate (salt) bearing unit toward the boxwork structures. The team celebrated the completion of another successful drive when we received the downlink this morning, and then we immediately got to work thinking about what’s next. There is a holiday in the United States on Monday, so instead of the typical three-sol weekend plan, we actually planned four sols, which will set us up to return to planning next Tuesday.
The first sol of the plan focuses on remote sensing, and we’ll be taking several small Mastcam mosaics of features around the rover. One of my favorite targets the team picked is a delightfully pointy rock visible toward the left of the Navcam image shown above. The color images we’ll take with Mastcam will give us more information about the textures of this rock and potentially provide insight into the geologic forces that transformed it into this comical shape. The team chose what I think is a very appropriate name for this Martian pyramid-shaped target — “Pyramid Lake.” The terrestrial inspiration behind this name is a human-made reservoir (lake) near Los Angeles with a big (also human-made) pyramidal hill in it.
On the second sol of the plan, we’ll use the instruments on Curiosity’s arm to collect data of rock targets at our feet, including “Strawberry Peak,” a bumpy piece of bedrock, “Lake Arrowhead,” a smooth piece of bedrock, and “Skyline Trail,” a dark float rock. ChemCam will also collect chemical data of Skyline Trail, “Big Tujunga” — which is similar to Strawberry Peak — and “Momyer.” We’ll also take the first part of a 360-degree color mosaic with Mastcam!
In the third sol of the plan, we’ll complete the 360-degree mosaic and continue driving to the southwest along our strategic route. The fourth sol is pretty quiet, with some atmospheric observations and a ChemCam AEGIS. Atmospheric observations are additionally sprinkled throughout other sols of the plan. This time of year we are particularly interested in studying the clouds above Gale crater!
I’m looking forward to the nice long weekend, and returning on Tuesday morning to see everything Curiosity accomplished.
Written by Abigail Fraeman, Planetary Geologist at NASA’s Jet Propulsion Laboratory
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Last Updated Feb 17, 2025 Related Terms
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Sols 4452-4453: Keeping Warm and Keeping Busy
NASA’s Mars rover Curiosity acquired this image of the science targets before it, including “Catalina Island,” the flat rock at image center, using its Left Navigation Camera. The rover captured the image on sol 4450 — or Martian day 4,450 of the Mars Science Laboratory mission — on Feb. 11, 2025, at 13:11:14 UTC. NASA/JPL-Caltech Earth planning date: Wednesday, Feb. 12, 2025
I woke up this morning to my weather app telling me it felt like minus 15° C (5°F) outside. On days like this, it can take me a little longer to get myself up and out into the world. Curiosity has a similar problem — as we head toward winter and it gets colder and colder in Gale Crater, Curiosity has to spend more time warming up to do things like driving and all our good science. I’ve also been watching a couple winter storms that are expected in the next few days here in Toronto. Luckily, Curiosity doesn’t have to deal with snowstorms, and our drive in the last plan went ahead as planned and put us in a good position to go ahead with contact science today, a relief after having to forego it on Monday.
The contact science location that the geology team chose is called “Catalina Island,” the flat rock you can see in almost the center of the image above. As you can likely also see above, there’s a whole jumble of rocks in that image, and Mastcam and ChemCam have picked out a couple others to take a look at. These are “Point Dume,” which will be the target of ChemCam’s laser spectrometer, and “Whittier Narrows,” on which Mastcam will image some linear features. Mastcam and ChemCam are also turning their gazes further afield for Mastcam targets “Cleghorn Ridge,” “Cuyamaca Peak,” “Kratka Ridge,” and two long-distance ChemCam mosaics of the top of the Wilkerson butte and a spot a little further down known as “Pothole Trail.”
Much like I’m keeping an eye out the window on the changing weather here, Curiosity is also continuing to keep an eye on the environment in Gale Crater. Even though it’s not the dusty season, we continue to monitor the dust around us and in the atmosphere with a dust-devil survey and a tau. But we’re especially interested in what the clouds are up to right now, which we’re checking in on with our normal zenith and suprahorizon movies, and our cloud-season-only Phase Function Sky Survey. This is a series of movies covering the whole sky that we can use to determine how sunlight interacts with the individual water-ice crystals in the clouds.
Written by Alex Innanen, Atmospheric Scientist at York University
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Last Updated Feb 14, 2025 Related Terms
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Sols 4450-4451: Making the Most of a Monday
NASA’s Mars rover Curiosity acquired this image of its brightly lit workspace and its right-front wheel in the shadows, perched on some tall rocks. The rover used its Right Front Hazcam (Front Hazard Avoidance Camera) to capture the image on sol 4449 — or Martian day 4,449 of the Mars Science Laboratory mission — Feb. 10, 2025, at 10:44:45 UTC. NASA/JPL-Caltech Earth planning date: Monday, Feb. 10, 2025
Last Saturday around 20:00 Pacific Standard Time I saw a 22-degree halo encircling our mostly-full Moon and Mars; an entire planet hanging in the sky between our Moon and the atmospheric phenomenon. As I took in the view I wondered what our rover was doing at that moment… turns out the Sun had just risen over Gale crater and Curiosity was still asleep, waiting for her alarm to go off in about 2.5 hours for another full day of science.
She wouldn’t start the weekend’s drive until Monday morning about 1:30, while I was still asleep waiting for my alarm to sound at 5:15. The drive’s data arrived on Earth about 5:30, and told us we drove until our time-of-day limit for driving — stopping about 36 meters (about 118 feet) away from Friday’s location. Unfortunately, our right-front wheel was shown to be perched on some tall rocks and we couldn’t quantify the drop risk if we unstowed the arm. We decided to play it safe and keep the arm stowed instead.
Today’s two-sol plan would normally be in “nominal” sols — meaning we’d get a full day of science and a drive on the second sol — but due to some DSN downtime on Earth we moved our drive to the first sol, therefore switching to “restricted” sols a bit earlier than usual after our last soliday. Even though we couldn’t plan contact science, we’re making the most of our plan with almost 90 minutes of remote sensing. Mastcam will take an approximately 24-frame stereo mosaic of Wilkerson butte to the north, and ChemCam will shoot their laser at a rock in our workspace named “Carbon Canyon,” as well as three separate RMI mosaics! We’ll then attempt to drive until our time-of-day limit of about 15:00 local Gale time, hopefully getting us to a more stable spot on Wednesday for contact science. The second sol contains our usual dust-devil surveys with Navcam, atmospheric opacity measurements with Mastcam, and a blind LIBS on a piece of bedrock the rover chooses autonomously.
Written by Natalie Moore, Mission Operations Specialist at Malin Space Science Systems
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Last Updated Feb 11, 2025 Related Terms
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Sols 4447–4449: Looking Back at the Marker Band Valley
NASA’s Mars rover Curiosity captured this image of its workspace using the rover’s Rear Hazard Avoidance Camera (Rear Hazcam) on sol 4447 — or Martian day 4,447 of the Mars Science Laboratory mission — on Feb. 8, 2025, at 13:54:13 UTC. NASA/JPL-Caltech Earth planning date: Friday, Feb. 7, 2025
We are continuing our merry way alongside “Texoli” butte, heading toward the boxworks feature in the distance, our next major waypoint. This is a series of large-scale ridges, which appear from orbital data to be a complex fracture network.
Of course, we don’t actually expect to get there until late fall 2025, at the earliest. Our drives are long right now (the weekend plan has a 50-meter drive, or about 164 feet) but we are still taking the time to document all of the wonderful geology as we go, and not just speeding past all of the cool things!
As Conor mentioned in Wednesday’s blog, power is becoming a challenge right now. Those of us in the northern hemisphere might be thinking (eagerly anticipating!) about the return of Spring but Mars is heading into colder weather, meaning we need to use more power for warming up the rover. However, we are also in a very interesting cloud season (as Conor mentioned), so the environmental theme group (ENV) are keen to do lots of imaging right now. This means very careful planning and negotiating between ENV and the geology theme group (GEO) to make the most of the power we do have. Luckily, this plan has something for everyone.
The GEO group was handed a weekend workspace containing a jumble of rocks — some layered, some not. None of the rocks were very large but we were able to plan APXS and MAHLI on a brushed rock surface at “Aliso Canyon” and on a small, flat unbrushed target, “Bridge to Nowhere,” close to the rover. ChemCam will use the LIBS laser to shoot three bedrock targets, sampling regular bedrock at “Newcomb,” some cracked bedrock at “Devore” and some of the more layered material at “Rubio Canyon.” Mastcam will document the ChemCam LIBS targets. In addition to the cloud imaging, we have lots of other imaging in this plan. We are in position right now to look back down at the “Marker Band Valley,” which we first entered almost a thousand sols ago! Before we go too much further along the side of Texoli butte and lose sight of the Marker Band Valley for some time, both ChemCam and Mastcam will take advantage of this to image the Marker Band Valley and the “Marker Band.” Other images include ChemCam remote images of cap rocks in the distance and two Mastcams of near-field (i.e., close to the rover) troughs.
Written by Catherine O’Connell-Cooper, Planetary Geologist at University of New Brunswick
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