Perseverance has taken its first sample from the Jezero delta!
Since arriving at the delta, the rover has been observing and abrading different rocks to inform whether they are good candidate for our first core sample in this area. The first few rocks that were considered either fractured too easily or had surfaces that were too rough to safely place the drill. The team searched for a rock with the following:
- scientifically interesting,
- a manageable amount of surface topography,
- large enough to fit an abrasion and two cores, and
- predicted to be robust to drilling.
The best candidate was a rock named Skinner Ridge.
The first activity on this rock was an abrasion called Thornton Gap, and immediately the team was excited. The abrasion was successful, revealing the inner surface of the rock without fracturing the surrounding area. It revealed that this rock contained individual clasts with clear boundaries. The rover’s full instrument suite was used to investigate and document the abraded patch, then it was time to core.
It turned out to be a great choice. The core was named Swift Run, and collecting it went very smoothly. At 6.70 cm long, it is our longest core of the mission so far. Perhaps even more exciting was to see that those same clasts visible in the abraded patch were also visible in the core. The drill data showed that the rock was one of the softer ones we have cored so far. It only required low levels of percussion to make progress through the rock, occasionally turning off percussion altogether when rotary only drilling was sufficient.
One last note for anyone wondering where these names come from. The Perseverance mission names areas after different national parks on Earth. Rocks, abrasions, and cores are given names related to the current area. The rover is currently in the Shenandoah quadrangle, named for the U.S. National Park in Virginia. Skinner Ridge, Thornton Gap, and Swift Run are all features in Shenandoah.