Only three countries have ever managed to land a spacecraft on the moon. Last month, Japan's ispace tried and failed with its Hakuto-R Mission 1 lunar lander.
It slammed into the surface after aiming for a landing site in a crater. A last-minute switch in the target shifted the altitude that its onboard sensors measured, and the software got confused.
The Crash
The moon has claimed many a spacecraft in its time, but few private companies have been able to successfully land their spacecraft on the surface. A Japanese startup called ispace is trying to change that with a mission scheduled for next year, and plans for another in 2025. But the company’s first attempt to make a soft landing on the lunar surface last month ended in disaster when its 7-foot lander plummeted from an altitude of 3 miles before smashing into the lunar terrain. A postmortem on the failure revealed that a software error caused the onboard computer to misjudge its distance from the ground.
ispace’s team of engineers are working on a full analysis of the telemetry data collected up until the end of the landing sequence, and will clarify the details once complete. But it’s safe to say that the problem was that the onboard computer believed it was closer to the ground than it really was, so it accelerated its descent and ran out of fuel.
The spacecraft, known as Hakuto-R, was attempting the world’s first commercial soft-landing on the moon when it went dark on April 25. It had completed eight out of the 10 required milestones before the crash, and was only 15 minutes away from a gentle landing. Then it was thrown into the crater-riddled surface and added to the already-pockmarked lunar regolith.
The Cause
The Japanese robotic spacecraft designed to land on the Moon smashed into its surface in April after a software glitch caused it to miscalculate its altitude, Japanese company Ispace says. During the landing attempt, the Hakuto-R Mission 1 lander estimated it was close to zero altitude when, in fact, it was about 3 miles up, Ispace says.
The lander was just 15 minutes away from a gentle landing when it smashed into the ground, creating another crater on the already pockmarked lunar regolith. A NASA satellite spotted the wreckage and other debris, and images from the site show the lander was at an unexpectedly high altitude.
Ispace CEO Takeshi Hakamada held out hope that the lander had survived until communication was lost shortly before the predicted touchdown time. He urged engineers to continue to watch the livestream but he conceded that the lander likely crashed.
Hakamada blamed computer simulations that did not include the terrain of the planned landing site, which was changed from its original destination months before launch. The change could have led to a discrepancy between the lander’s actual and expected altitude, and then the lander ran out of fuel as it struggled to slow down. Ispace plans to attempt a second Moon landing in 2024. If successful, it would be the first private company to do so. Only three countries—Russia, the United States and Israel—have ever landed on the Moon.
The Damage
The lander, the Hakuto-R Mission 1 — built by Ispace of Tokyo — ran out of fuel during its final descent and slammed into the moon, reports said. The start-up company was trying to become the first private company to land on the lunar surface.
It was just a few minutes before the planned landing time when the telemetry signal from the lander went dark, and the company lost contact with it. Engineers sat in a room in Tokyo, expressionless as minutes ticked by without word from the spacecraft. A webcast commentator asked for patience and urged everyone to keep watching.
Eventually, the engineers were forced to concede that they had lost contact with the unmanned craft. The Hakuto-R lander had been carrying payloads for the Japanese and international companies, including a small rover from the United Arab Emirates and a baseball-sized "transformable" robot from Japan's space agency.
If the lander had successfully made a soft landing, the spacecraft would have provided valuable data about the lunar environment and the conditions that exist underneath the surface. The mission's failure is a blow to Ispace and the growing community of private space startups aiming to compete with government-run space agencies for the next frontier in exploration. But even after the crash, the founders of ispace and other start-ups are determined to push ahead with plans for more moonshots.
The Recovery
A private company's attempt to send a spacecraft to the moon ended in failure after the craft lost contact as it descended toward the surface. Ispace says it appears the Hakuto-R Mission 1 lunar lander slammed into the lunar surface, a setback for the Tokyo-based company and Japan's push into commercial space.
The company's CEO, Takeshi Hakamada, had hoped for the best as the lander neared its final descent into Atlas Crater in Mare Frigoris on the Moon's northern hemisphere. He urged engineers to watch the live animation of the lander's telemetry, but as it drew closer to its destination communication was lost.
Engineers say the lander likely ran out of fuel as it began to slow down for its landing. They had expected the lander to use its thrusters to ease its landing. Instead, the lander may have hit too hard.
Hakuto-R, which means white rabbit, was carrying payloads from two nations -- the Japanese aerospace agency and the United Arab Emirates. JAXA had planned to deploy its two-wheeled transformable lunar robot, while the UAE wanted to test its Rashid rover on the Moon. Other payloads included a test unit for a solid-state battery and 360-degree cameras.
If the lander had succeeded, it would have been the first private commercial spacecraft to make it to the lunar surface intact. But that will have to wait.
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