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An illustration of the SLIM lander descending onto the moon’s surface
(Image credit: JAXA)
Japan successfully became the fifth nation to land on the moon on Friday (Jan. 19), when the country’s robotic Smart Lander for Investigating the Moon (SLIM) successfully descended to the lunar surface at 10:20 a.m. EST (or 12:20 a.m. on Saturday, Jan. 20 in Japan).
The craft seems to have succeeded in making a soft landing on the moon, as SLIM is currently sending and receiving data from its new home near Shioli crater on the lunar near-side, mission officials said in a televised press conference on Friday. However, the lander may only survive for a few hours there following an error with the lander’s solar energy cells, which are not generating electricity as expected, the officials said.
SLIM is currently running on reserve battery power, which will likely run out within a few hours. That gives researchers a limited time to carry out science operations with the lander before it goes offline. SLIM’s solar cells may yet be able to generate electricity if the orientation of incoming sunlight changes and hits the panels in the coming weeks, the officials added. However, the lander’s ultimate fate remains uncertain.
Despite this setback, Japan joins the United States, Russia, China and India as the only nations to successfully land a spacecraft on the moon.
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SLIM — built by Japan’s space agency (JAXA) and nicknamed the “Moon Sniper” — was designed to demonstrate a new navigation system capable of achieving pinpoint landings on the lunar surface. The mission’s goal was to land the craft within a scant 330 feet (100 meters) of its target landing site, near the rim of Shioli crater, according to Live Science’s sister site Space.com. It could take up to a month to verify how close the craft landed to its target, JAXA has said.
SLIM launched from Japan’s Tanegashima Space Center in Minamitane on Sept. 6, 2023, and it reached a lunar orbit on Dec. 25. The craft spent the following weeks orbiting the moon and testing various systems before attempting its landing on Friday.
SLIM, which measures about the size of a small truck, carried two robotic rovers with it, named Lunar Excursion Vehicle 1 and 2 (LEV-1 and LEV-2). The mission called for SLIM to deploy the two rovers during its attempted landing — and one of them (LEV-1) seems to be online.
This was not Japan’s first attempted lunar landing. Last year, the private Japanese company ispace attempted to land its Hakuto-R lunar lander, but ground controllers lost contact with the craft during its descent on April 25, resulting in a crash landing. Earlier, in November 2022, a small lander named OMOTENASHI hitched a ride on NASA’s uncrewed Artemis I mission. The tiny lander failed to survive its descent to the lunar surface, while the Artemis capsule continued its mission around the moon and then back to Earth.
An illustration of the two Lunar Excursion Vehicles (LEV-1 and LEV-2) carried by SLIM (Image credit: JAXA)
Several recent lunar landing attempts made by other nations and private companies have also gone awry.
On Jan. 8, the Peregrine lunar lander designed by U.S.-based space company Astrobotic Technology suffered a critical propellant leak just hours after launching, dooming the craft to burn up in Earth’s atmosphere instead of completing its trip to the moon. And in August 2023, Russia’s Luna 25 lander crashed into the moon’s south pole during its attempted landing, leaving a new 33-foot-wide (10 m) crater behind.
Several weeks later, India’s Chandrayaan-3 lander successfully landed at the lunar south pole, making India the first nation to land there, and the fourth to make a soft landing on the moon. However, the craft only remained operational for about a month before losing power.
The lunar south pole is a popular target for future space missions, due largely to the abundance of frozen water locked up in permanently shadowed craters there.
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Brandon is the space/physics editor at Live Science. His writing has appeared in The Washington Post, Reader’s Digest, CBS.com, the Richard Dawkins Foundation website and other outlets. He holds a bachelor’s degree in creative writing from the University of Arizona, with minors in journalism and media arts. He enjoys writing most about space, geoscience and the mysteries of the universe.
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