Perseverance Mars Rover will acquire the first sample

NASA is making final preparations for its Perseverance Mars rover to collect its very first Martian rock sample, which future planned missions will transport to Earth. The six-wheeled geologist is looking for a scientifically interesting target in a part of Jezero crater called “Cratered Floor Fractured Rough”.

This milestone of the mission is expected to begin within the next two weeks. Perseverance landed in Jezero Crater on February 18, and NASA launched the science phase of the rover’s mission on June 1, exploring a 1.5 square mile (4 square kilometer) crater terrain that can hold the layers. Jezero’s deepest and oldest exposed bedrock.

“When Neil Armstrong took the first sample of Sea of ​​Tranquility 52 years ago, he initiated a process that would rewrite what humanity knew about the Moon,” said Thomas Zurbuchen, associate administrator for science at NASA headquarters. “I expect the first Perseverance sample from Jezero Crater, and those to follow, will do the same for Mars. We are on the threshold of a new era of science and planetary discovery.”

It took Armstrong 3 minutes and 35 seconds to collect this first sample of the Moon. Perseverance will take around 11 days to complete its first sample, as it must receive its instructions from hundreds of millions of miles away while relying on the most complex and capable, as well as the cleanest mechanism ever sent. in space – the Sampling and caching system.

Precision instruments working together

The sampling sequence begins when the rover places everything needed for sampling within reach of its 2 meter long robotic arm. It will then perform an imaging study, so that the NASA science team can determine the exact location to collect the first sample and a separate target site in the same area for “proximity science.”

“The idea is to get valuable data on the rock we are about to sample by finding its geological twin and performing a detailed in situ analysis,” said Vivian Sun, co-head of the science campaign. , from NASA’s Jet Propulsion Laboratory in Southern California. “On the geologic double, we first use an abrasive drill to scrape the top layers of rock and dust to expose cool, unaltered surfaces, clean it with our gas dust removal tool, and then get close with our turret. proximity scientific instruments mounted SHERLOC, PIXL and WATSON. “

SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals), PIXL (Planetary Instrument for X-ray Lithochemistry) and the WATSON (Wide Angle Topographic Sensor for Operations and Engineering) camera will provide mineral and chemical analysis of the abraded target.

Perseverance’s SuperCam and Mastcam-Z instruments, both located on the rover’s mast, will also participate. As SuperCam shoots its laser at the abraded surface, spectroscopically measuring the resulting plume and collecting other data, Mastcam-Z will capture high resolution images.

Together, these five instruments will enable unprecedented analysis of geological materials on the jobsite.

“Once our pre-coring science is complete, we’ll limit the rover’s tasks to a Martian soil or day,” Sun said. “This will allow the rover to fully recharge its battery for the events of the next day.”

The sampling day begins with the sample handling arm in the Adaptive Caching Assembly which retrieves a sample tube, heats it, and then inserts it into a drill bit. A device called a drill bit carousel transports the tube and bit to a rotary impact drill on Perseverance’s robotic arm, which will then pierce the intact geologic “twin” of the rock under investigation into the previous soil, filling the tube with a core of about the size of a piece of chalk.

The Perseverance arm will then move the combination of bits and tubes through the bit carousel, which will transfer it to the adaptive caching assembly, where the sample volume will be measured, photographed, hermetically sealed, and stored. The next time the contents of the sample tube are seen, they will be in a clean room on Earth, for analysis using scientific instruments far too large to be sent to Mars.

“Not all of the samples Perseverance collects will be done as part of the Old Life Quest, and we don’t expect this first sample to provide definitive proof in one way or another,” he said. said Ken Farley, Scientist for the Perseverance Project, Caltech. “While the rocks in this geological unit are not excellent time capsules for organics, we believe they have been around since the formation of Jezero Crater and are incredibly valuable in filling gaps in our geological understanding. of this region – things that we will desperately need to know if we find that life has ever existed on Mars. ”