NASA’s Perseverance celebrated its second anniversary on the surface of Mars on February 18. Since arriving at Jezero Crater in 2021, the six-wheeled, nuclear-powered rover has been examining geologic features and collecting samples of the Red Planet that are central to the first step of the NASA-ESA (European Space Agency) Mars Sample Return campaign. Scientists want to study martian samples with powerful lab equipment on Earth to search for signs of ancient microbial life and to better understand the processes that have shaped the surface of Mars.

“Anniversaries are a time of reflection and celebration, and the Perseverance team is doing a lot of both,” said Perseverance project scientist Ken Farley of Caltech in Pasadena. “Perseverance has inspected and performed data collection on hundreds of intriguing geologic features, collected 15 rock cores, and created the first sample depot on another world. With the start of the next science campaign, known as ‘Upper Fan,’ on February 15, we expect to be adding to that tally very soon.”

In addition to the rock cores, Perseverance has collected two regolith samples and one atmospheric sample, and it has sealed three “witness” tubes. Click here to learn more about the samples taken so far.

Numbers play a big role in the life of a Mars rover mission, not just because the team includes an impressive quantity of scientists (who don’t usually mind numbers) and engineers (who love them), but because statistics provide the best and most efficient glimpse of vehicle trends and performance.

For instance, the mission can tell you not only that the rover has driven 14.97 kilometers (9.3 miles), but also that as of February 14, its left front wheel has performed 9,423 revolutions. They can tell you not only that the Mars Oxygen In-Situ Resource Utilization Experiment (MOXIE) technology demonstration has produced 92.11 grams (3.25 ounces) of oxygen, but also that the Gas Dust Removal Tool (gDRT) — the little gas-puffing device on the robotic arm — has puffed 62 times to clear residual dust and particles from rock-abrading activities.

“We deal with a lot of numbers,” said Perseverance deputy project manager Steve Lee from NASA’s Jet Propulsion Laboratory (JPL) in Southern California. “We collect them, evaluate them, compare them, and more times than we want to admit, bore our loved ones with them during a family dinner.”

With that, here are some of the most up-to-date statistics regarding Perseverance’s first two Earth years of Jezero surface operations. Some will seem obscure, while others are more immediate, but they all underscore how productive the mission has been.

The rover carries seven science instruments, and they’ve been busy.

• Laser shots fired by the SuperCam science instrument: 230,554
• Soundings performed by the Radar Imager for Mars’ Subsurface Experiment (RIMFAX) ground-penetrating radar to study underground rock layers: 676,828
• Mars audio recordings taken by SuperCam’s microphone: 662
• Hours of Mars weather data recorded by the Mars Environmental Dynamics Analyzer (MEDA): 15,769.1
• Hours the X-ray filament on the Planetary Instrument for X-ray Lithochemistry (PIXL) instrument has operated: 298.2
• Laser shots by the Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals (SHERLOC) instrument: 4,337,010
• SHERLOC spectroscopy observations: 33

Along with the massive drill-toting robotic arm, the rover has a small sample handling arm inside its belly.

• Times the rover’s main robotic arm has been unstowed and stowed: 64
• Times the drill on that arm has touched Mars: 39
• Times drill bits have been exchanged: 48
• Abrasions performed by the drill: 17
• Distance the rover’s sample handling arm’s z-stage has traveled up and down: 206.1 meters (676.1 feet)

Perseverance packs seven science cameras along with nine engineering cameras. Together, those cameras have taken more than 166,000 images. Here are the image tallies for several of them.

• Mastcam-Z: 86,660
• Navigation Cameras: 21,571
• Front Hazard-Avoidance Cameras: 3,909
• Rear Hazard-Avoidance Cameras: 474
• Sampling and Caching System Camera: 1,321
• SuperCam Remote Micro-Imager: 2,825
• MEDA SkyCam: 1,831
• PIXL Micro-Context Camera: 1,012
• SHERLOC WATSON: 5,754
• SHERLOC Context Imager: 2,260
• Entry, Descent, and Landing Cameras: 33,279

“Behind each number is a lot of thought and effort from a very talented group of women and men on the Perseverance team,” said Art Thompson, Perseverance project manager at JPL. “We have come a long way together, and I can’t think of a better group to work with as we go even farther.”

In fact, when Perseverance marked its second landing anniversary, Mars was 156 kilometers (97 million miles) from Earth. The weather at Jezero Crater was expected to be sunny with a high of about minus 14°C (7°F). The rover has instructions to perform remote science and take images of a place in Jezero Crater called “Jenkins Gap.” People on the mission team were able to take a moment to recall where they were and how they felt two years ago when Perseverance landed on Mars.

For more highlights of Perseverance’s first two years on Mars, visit https://mars.nasa.gov/mars2020/mission/highlights/.