NASA’s Jet Propulsion Laboratory had to turn off Voyager 1’s LECP, or Low-energy Charged Particles experiment, in a bid to reduce power consumption as its nuclear power source continues to lose power over time due to aging. According to the government agency, an unexpected drop in power levels forced the team to reduce the number of instruments on board and prevent it from activating its undervoltage protection system. This would force the spacecraft to deactivate components on its own and require manual intervention from the flight team to ensure that it can continue operating until (and, hopefully, beyond) its 50th year in space.
The LECP measures ions, electrons, and cosmic rays from our solar system and the surrounding areas, which, NASA says, “has provided critical data about the structure of the interstellar medium, detecting pressure fronts, and regions of varying particle density in the space beyond our heliosphere.” While this has been a useful instrument aboard the Voyager 1, the spacecraft is slowly running out of fuel, requiring NASA to pick and choose which ones it will leave running to increase its longevity.
This space probe is powered by a radioisotope thermoelectric generator (RTG), its nuclear power source, which converts the heat of decaying plutonium into electricity. Its onboard RTG had around 470 watts when it launched in 1977 for a five-year mission, and it’s estimated that it loses about 4 watts annually. Universe Today estimated in 2019 that Voyager 1 still had under 270 watts left, about 57% of its onboard power, so it’s expected to have even less today.
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There shouldn’t have been an issue with this, but a planned roll maneuver in February caused a sudden drop in power. While this wasn’t a foreseen event, NASA scientists already have several planned contingencies for cases like this, which include turning off the LECP. The team did not fully shut off the instrument, though — it left its small motor, which only consumed 0.5 watts, turned on so that it’s easier to reactivate the LECP if they wanted to.
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