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NASA Turns Off 2 Voyager Science Instruments to Extend Mission


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Preparations for Next Moonwalk Simulations Underway (and Underwater)

An artist’s concept of the Voyager spacecraft, set against a starry blue and purple background.
An artist’s concept depicts one of NASA’s Voyager probes. The twin spacecraft launched in 1977.
NASA/JPL-Caltech

The farthest-flung human-made objects will be able to take their science-gathering even farther, thanks to these energy-conserving measures.

Mission engineers at NASA’s Jet Propulsion Laboratory in Southern California turned off the cosmic ray subsystem experiment aboard Voyager 1 on Feb. 25 and will shut off Voyager 2’s low-energy charged particle instrument on March 24. Three science instruments will continue to operate on each spacecraft. The moves are part of an ongoing effort to manage the gradually diminishing power supply of the twin probes.

Launched in 1977, Voyagers 1 and 2 rely on a radioisotope power system that generates electricity from the heat of decaying plutonium. Both lose about 4 watts of power each year.

“The Voyagers have been deep space rock stars since launch, and we want to keep it that way as long as possible,” said Suzanne Dodd, Voyager project manager at JPL. “But electrical power is running low. If we don’t turn off an instrument on each Voyager now, they would probably have only a few more months of power before we would need to declare end of mission.”

The two spacecraft carry identical sets of 10 science instruments. Some of the instruments, geared toward collecting data during planetary flybys, were turned off after both spacecraft completed their exploration of the solar system’s gas giants.

The instruments that remained powered on well beyond the last planetary flyby were those the science team considered important for studying the solar system’s heliosphere, a protective bubble of solar wind and magnetic fields created by the Sun, and interstellar space, the region outside the heliosphere. Voyager 1 reached the edge of the heliosphere and the beginning of interstellar space in 2012; Voyager 2 reached the boundary in 2018. No other human-made spacecraft has operated in interstellar space.

Last October, to conserve energy, the project turned off Voyager 2’s plasma science instrument, which measures the amount of plasma — electrically charged atoms — and the direction it is flowing. The instrument had collected only limited data in recent years due to its orientation relative to the direction that plasma flows in interstellar space. Voyager 1’s plasma science instrument had been turned off years ago because of degraded performance.

Interstellar Science Legacy

The cosmic ray subsystem that was shut down on Voyager 1 last week is a suite of three telescopes designed to study cosmic rays, including protons from the galaxy and the Sun, by measuring their energy and flux. Data from those telescopes helped the Voyager science team determine when and where Voyager 1 exited the heliosphere.

Scheduled for deactivation later this month, Voyager 2’s low-energy charged particle instrument measures the various ions, electrons, and cosmic rays originating from our solar system and galaxy. The instrument consists of two subsystems: the low-energy particle telescope for broader energy measurements, and the low-energy magnetospheric particle analyzer for more focused magnetospheric studies.

Both systems use a rotating platform so that the field of view is 360 degrees, and the platform is powered by a stepper motor that provides a 15.7-watt pulse every 192 seconds. The motor was tested to 500,000 steps — enough to guarantee continuous operation through the mission’s encounters with Saturn, which occurred in August 1980 for Voyager 2. By the time it is deactivated on Voyager 2, the motor will have completed more than 8.5 million steps.

“The Voyager spacecraft have far surpassed their original mission to study the outer planets,” said Patrick Koehn, Voyager program scientist at NASA Headquarters in Washington. “Every bit of additional data we have gathered since then is not only valuable bonus science for heliophysics, but also a testament to the exemplary engineering that has gone into the Voyagers — starting nearly 50 years ago and continuing to this day.”

Addition Through Subtraction

Mission engineers have taken steps to avoid turning off science instruments for as long as possible because the science data collected by the twin Voyager probes is unique. With these two instruments turned off, the Voyagers should have enough power to operate for about a year before the team needs to shut off another instrument on both spacecraft.

In the meantime, Voyager 1 will continue to operate its magnetometer and plasma wave subsystem. The spacecraft’s low-energy charged particle instrument will operate through the remainder of 2025 but will be shut off next year.  

Voyager 2 will continue to operate its magnetic field and plasma wave instruments for the foreseeable future. Its cosmic ray subsystem is scheduled to be shut off in 2026.

With the implementation of this power conservation plan, engineers believe the two probes could have enough electricity to continue operating with at least one science instrument into the 2030s. But they are also mindful that the Voyagers have been weathering deep space for 47 years and that unforeseen challenges could shorten that timeline.

Long Distance

Voyager 1 and Voyager 2 remain the most distant human-made objects ever built. Voyager 1 is more than 15 billion miles (25 billion kilometers) away. Voyager 2 is over 13 billion miles (21 billion kilometers) from Earth.

In fact, due to this distance, it takes over 23 hours to get a radio signal from Earth to Voyager 1, and 19½ hours to Voyager 2.

“Every minute of every day, the Voyagers explore a region where no spacecraft has gone before,” said Linda Spilker, Voyager project scientist at JPL. “That also means every day could be our last. But that day could also bring another interstellar revelation. So, we’re pulling out all the stops, doing what we can to make sure Voyagers 1 and 2 continue their trailblazing for the maximum time possible.”

For more information about NASA’s Voyager missions, visit:
https://science.nasa.gov/mission/voyager

News Media Contacts

DC Agle / Calla Cofield
Jet Propulsion Laboratory, Pasadena, Calif.
818-653-6297 / 626-808-2469
agle@jpl.nasa.gov / calla.e.cofield@jpl.nasa.gov

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      Shortly after reaching orbit, the crew opened the payload bay doors and deployed the shuttle’s radiators. Jernigan and Durrance activated the Spacelab pallet and its pointing system and the telescopes. The crew split into two shifts to enable data collection around the clock during the mission. Oswald, Gregory, Grunsfeld, and Parise made up the red shift while Lawrence, Jernigan, and Durrance comprised the blue shift. 
      Stephen Oswald conducts a session with the Middeck Active Control Experiment. NASA Wendy Lawrence monitors a protein crystal growth apparatus. NASA John Grunsfeld, left, and Samuel Durrance at the controls of the telescopes on the shuttle’s aft flight deck. NASA William Gregory conducts a biotechnology experiment in Endeavour’s middeck. NASA Samuel Durrance and Tamara Jernigan assemble the day’s teleprinter message. NASA Ronald Parise floats near the shuttle’s overhead window.NASA For the remainder of the mission, the astronauts operated the telescopes, conducting 385 maneuvers of Endeavour to point the instruments at the celestial targets. The results met or exceeded preflight expectations. The crew also conducted a series of middeck investigations in technology demonstration and biotechnology. The Middeck Active Control Experiment studied the active control of flexible structures in space. Five years later, a newer version flew as one of the first experiments on the International Space Station. 

      A selection of the STS-67 crew Earth observation photographs. Gulf of Batabano, Cuba.NASA Antofagasta, Chile. NASA Volcanic eruption on Barren Island, Andaman Islands.NASA Disappointment Reach, Western Australia. NASA Like all space crews, the STS-67 astronauts also spent time taking photographs of the Earth using handheld cameras. The mission’s long duration enabled them to image many targets. 
      The seven-person STS-67 crew poses for an in-flight photo. NASA Endeavour touches down at Edwards Air Force Base in California. NASA On March 14, an eighth American joined the STS-67 crew in space when NASA astronaut Norman Thagard blasted off with two cosmonauts, headed for space station Mir. With three other cosmonauts already aboard Mir, the total number of humans in orbit grew to a then-record of 13. Two days later, Oswald and Thagard, who had flown together on STS-42, talked to each other via ship-to-ship radio. 
      Inclement weather at Kennedy thwarted the planned reentry on March 17, and the astronauts spent an extra day in space. On March 18, they again waved off a Kennedy landing and one orbit later, Oswald and Gregory piloted Endeavour to a smooth landing at Edwards Air Force Base in California. The crew had flown 262 orbits around the Earth in 16 days, 15 hours, and 9 minutes, at the time the longest space shuttle mission. A few hours later, a large crowd greeted the astronauts upon their return to Houston’s Ellington Field. Endeavour began its ferry flight back to Kennedy on March 26, arriving there the next day. Workers towed Endeavour to the processing facility to prepare it for its next flight, STS-73, then planned for September 1995. 
      Watch the crew narrate a video about the STS-67 mission.  

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