NASA's Mars 2020 Perseverance Rover Gets Balanced
The mission team performed a crucial weight-balancing test on the rover in preparation for this summer's history-making launch to the Red Planet.
With 13 weeks to go before the launch period of NASA's
Mars 2020 Perseverance rover opens, final preparations of the spacecraft
continue at the Kennedy Space Center in Florida. On April 8, the assembly, test and launch
operations team completed a crucial mass properties test of the rover.
Precision
mass properties measurements are essential to a safe landing on Mars because they
help ensure that the spacecraft travels accurately throughout
its trip to the Red Planet - from launch through its entry, descent and
landing.
On April 6, the meticulous
three-day process began with Perseverance being lifted onto the rover turnover fixture.
The team then slowly rotated the rover around its x-axis - an imaginary line
that extends through the rover from its tail to its front - to determine its
center of gravity (the point at which weight is evenly dispersed on all sides)
relative to that axis.
The
team then moved the rover to a spin table. To minimize friction that could affect
the accuracy of the results, the table's surface sits on a spherical air
bearing that essentially levitates on a thin layer of nitrogen gas. To
determine center of gravity relative to the rover's z-axis (which extends from
the bottom of the rover through the top) and y-axis (from the rover's left to
right side), the team slowly rotated the vehicle back and forth, calculating the imbalance in
its mass distribution.
Just as an auto mechanic places small weights on a car tire's
rim to bring it into balance, the Perseverance team analyzed the data and then added
13.8 pounds (6.27 kilograms) to the rover's chassis. Now the rover's
center of gravity is within 0.001 inch (0.025
millimeters) of the exact spot mission designers intended.
The Perseverance rover is a robotic scientist weighing
about 2,260
pounds (1,025 kilograms). It will search for signs of past microbial life,
characterize the planet's climate and geology, collect samples for future
return to Earth, and pave the way for human exploration of the Red Planet. No
matter what day Perseverance launches during its July 17-Aug. 5 launch period,
it will land on Mars' Jezero Crater on Feb. 18, 2021.
The Mars 2020
Perseverance rover mission is part of a larger program that includes missions
to the Moon as a way to prepare for human exploration of the Red Planet.
Charged with returning astronauts to the Moon by 2024, NASA will establish a
sustained human presence on and around the Moon by 2028 through NASA's Artemis
lunar exploration plans.
For more
information about the mission, go to:
https://mars.nasa.gov/mars2020/
For more about
NASA's Moon to Mars plans, visit:
https://www.nasa.gov/topics/moon-to-mars
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