Parker Solar Probe Begins Space Environment Testing

People in clean suits work on the spacecraft inside a large chamber
Parker Solar Probe team members from the Johns Hopkins Applied Physics Laboratory work to attach testing and monitoring equipment and sensors to the spacecraft inside the thermal vacuum chamber at NASA’s Goddard Space Flight Center. Space environment testing duplicates the airless environment of space and simulates the cold and hot temperature cycles the spacecraft will endure during its seven-year exploration of the Sun. Credit: NASA/Johns Hopkins APL/Ed Whitman

On Saturday, Jan. 27, NASA’s Parker Solar Probe began space environment testing, starting with the air being pumped out of the 40-foot-tall thermal vacuum chamber at NASA’s Goddard Space Flight Center in Greenbelt, Maryland where the spacecraft is currently housed. The chamber – officially called the Space Environment Simulator – creates a nearly identical replication of the conditions the spacecraft will face during its mission to the Sun.

After the air was slowly removed from the chamber over the course of five hours, cooling tubes behind the chamber walls were chilled to -320 degrees Fahrenheit (-196 Celsius).

Several people in clean suits work on the spacecraft inside a large chamber
Members of the Parker Solar Probe team prepare the spacecraft for space environment testing in the thermal vacuum chamber at NASA’s Goddard Space Flight Center. The thermal vacuum chamber duplicates the airless environment of space and simulates the cold and hot temperature cycles the spacecraft will endure during its seven-year exploration of the Sun. Credit: NASA/Johns Hopkins APL/Ed Whitman

Engineers will cycle the chamber’s temperatures from hot to cold to ensure Parker Solar Probe will be prepared for operations around the Sun. During this cycling, the spacecraft’s systems will undergo testing that mimics critical events that occur during its planned seven-year mission in space. The tests are designed to make sure all the systems and components of Parker Solar Probe are operating as designed.

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This space environment testing will continue for about seven weeks. Parker Solar Probe will emerge from the vacuum chamber in mid-March for final tests before setting off for Florida, where it will launch from NASA’s Kennedy Space Center on July 31, 2018.

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By Justyna Surowiec

Johns Hopkins Applied Physics Laboratory

The spacecraft sits inside a large chamber with wires all around an two people in clean suits in the background.
To prepare NASA’s Parker Solar Probe for space environment testing, the team must make hundreds of connections to allow the engineers and technicians to monitor the safety and performance of the spacecraft’s systems. Four hundred thermocouples mounted on the spacecraft let the team track the health of the probe as it undergoes temperature cycling in the thermal vacuum chamber at NASA’s Goddard Space Flight Center. Credit: NASA/Johns Hopkins APL/Ed Whitman
The spacecraft is seen from a low angle inside the thermal vacuum chamber.
NASA’s Parker Solar Probe sits inside the thermal vacuum chamber at NASA’s Goddard Space Flight Center. On Jan. 27, the spacecraft began space environment testing inside the chamber, which simulates the hot and cold airless environments that the mission will experience during its voyage to the Sun. Credit: NASA/Johns Hopkins APL/Ed Whitman
The spacecraft is seen sitting in a large chamber through the doorway.
NASA’s Parker Solar Probe sits inside the thermal vacuum chamber at NASA’s Goddard Space Flight Center just before the main hatch is closed to begin space environment testing. The thermal vacuum chamber duplicates the airless environment of space and simulates the cold and hot temperature cycles the spacecraft will endure during its seven-year exploration of the Sun. Credit: NASA/Johns Hopkins APL/Ed Whitman

Parker Solar Probe Enters Thermal Vacuum Chamber

On Wednesday, Jan. 17, NASA’s Parker Solar Probe was lowered into the 40-foot-tall thermal vacuum chamber at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. The spacecraft will remain in the chamber for about seven weeks, coming out in mid-March for final tests and packing before heading to Florida. Parker Solar Probe is scheduled to launch from NASA’s Kennedy Space Center on July 31, 2018, on a Delta IV Heavy launch vehicle.

The spacecraft is lifted into the air by a crane
Parker Solar Probe is slowly lifted and carried to the top of the thermal vacuum chamber, which will simulate the airless environment of space, in addition to conducting intense hot and cold temperature testing.
Credit: NASA/JHUAPL/Ed Whitman

The thermal vacuum chamber simulates the harsh conditions that Parker Solar Probe will experience on its journey through space, including near-vacuum conditions and severe hot and cold temperatures.

“This is the final major environmental test for the spacecraft, and we’re looking forward to this milestone,” said Annette Dolbow, Parker Solar Probe’s integration and test lead from the Johns Hopkins Applied Physics Lab. “The results we’ll get from subjecting the probe to the extreme temperatures and conditions in the chamber, while operating our systems, will let us know that we’re ready for the next phase of our mission – and for launch.”

The spacecraft is lowered into the thermal vacuum chamber
NASA’s Parker Solar Probe descends into the thermal vacuum chamber at NASA’s Goddard Space Flight Center. The spacecraft will be inside the chamber for about seven weeks.
Credit: NASA/JHUAPL/Ed Whitman

During thermal balance testing, the spacecraft will be cooled to -292 degrees Fahrenheit. Engineers will then gradually raise the spacecraft’s temperature to test the thermal control of the probe at various set points and with various power configurations.

Next, thermal cycling testing will transition the spacecraft from cold to hot and back again several times, simulating the conditions it will experience many times during its mission to the Sun. The Parker Solar Probe team will also test operation of the spacecraft’s hardware at both hot and cold plateaus, as well as perform a mission simulation.

People push a spacecraft wrapped in translucent material on a rolling platform
Members of the NASA Parker Solar Probe team wheel the spacecraft – bagged to protect it from contamination – from its cleanroom at NASA’s Goddard Space Flight Center in Greenbelt, Md., to the thermal vacuum chamber, where it will undergo approximately seven weeks of testing at extreme temperatures that will simulate the space environment.
Credit: NASA/JHUAPL/Ed Whitman
The spacecraft is lowered into the thermal vacuum chamber
Engineers and technicians from the Parker Solar Probe team monitor the descent of the spacecraft into the thermal vacuum chamber.
Credit: NASA/JHUAPL/Ed Whitman
People begin reconnecting the spacecraft to power inside the thermal vacuum chamber
Parker Solar Probe team members begin the process of reattaching the spacecraft to power and other systems in preparation for testing the operation of the probe in intense heat and cold while in an airless environment.
Credit: NASA/JHUAPL/Ed Whitman

Download these images in HD formats from NASA’s Scientific Visualization Studio. 

By Sarah Frazier

NASA’s Goddard Space Flight Center