Moon mission in jeopardy: Japanese lander crippled by power glitch

A robotic Japanese moon lander, known as Smart Lander for Investigating the Moon (SLIM), encountered a power glitch upon touching down on the lunar surface. This glitch inhibited its solar cells from generating the necessary electricity to sustain its operations in the harsh lunar environment. Consequently, without the ability to transmit telemetry and scientific data back to Earth, the lander was expected to deplete its batteries within a few hours of landing. While there is a glimmer of hope that the lander may “wake up” if the angle between the sun and the solar cells improves, the certainty of this outcome remains uncertain. Hitoshi Kuninaka, director general of the Japan Aerospace Research Agency (JAXA), conveyed that the lander is currently reliant on battery power and the mission’s operators are striving to maximize the scientific output before the batteries are depleted.

Demise of the Peregrine moon lander

Recent setbacks in moon exploration include the Peregrine lander, constructed by Astrobotic, which was stranded in a highly elliptical Earth orbit due to a valve malfunction. Consequently, its propellant tank ruptured shortly after launch, leading to its destruction upon re-entry into Earth’s atmosphere. Despite this setback, Astrobotic’s CEO, John Thornton, commended the efforts of the flight controllers in managing the mission and outlined the incorporation of lessons learned into their upcoming Griffin program, reinforcing the company’s commitment to future successful moon landings.

Japan's plans for a moon landing

JAXA’s SLIM lander was designed with the dual objectives of demonstrating a high-precision landing system and testing an innovative lightweight design that allows for the integration of more sensors and instruments. Launched from the Tanegashima Space Center in southern Japan, the spacecraft successfully maneuvered into a circular orbit around the moon prior to commencing its final descent to the lunar surface. The lander was also equipped with micro rovers, LEV-1 and LEV-2, and was programmed to execute a precise landing on a sloped surface to optimize solar power generation.
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In conclusion, the challenges encountered by the Japanese moon lander and the Peregrine lander serve as poignant reminders of the complexities and risks associated with space exploration. However, these setbacks also catalyze ongoing efforts to enhance mission resilience and success rates, further propelling the advancement of human endeavors beyond Earth.

Exploring the Successful Landing of the SLIM Spacecraft

The successful landing of the SLIM spacecraft has led to an exciting phase of discovery and data acquisition. The Japan Aerospace Exploration Agency (JAXA) initiated a mission that involved the deployment of SLIM, along with two tiny rovers, to investigate the surface of an asteroid. This groundbreaking mission aims to unlock the secrets of celestial bodies and enhance our understanding of the universe. Let’s delve into the details of the successful landing and the subsequent data acquisition process.

Achieving Successful Telemetry Reception

One of the critical milestones following the landing of the SLIM spacecraft was the reception of telemetry data. The Deep Space Network, operated by NASA, played a pivotal role in this process. Despite initial concerns about the survival of the spacecraft, telemetry data from SLIM and the accompanying rovers started to be received just an hour after touchdown. This prompt reception of data provided valuable insights into the status of the mission and the condition of the deployed assets.

Confirmation of Data Reception

During the post-landing news conference, JAXA officials confirmed the reception of telemetry from both SLIM and the rovers, demonstrating the functionality of these components. The successful acquisition of data from LEV-1, designed to transmit data directly to Earth, further affirmed the progress of the mission. Additionally, LEV-2 effectively relayed data through SLIM, enhancing the overall data transmission capabilities of the mission.

Assessment of Spacecraft Functionality

Kuninaka, a spokesperson for JAXA, provided an optimistic outlook regarding the condition of the SLIM spacecraft. He expressed confidence in the integrity of the solar cells, indicating that they remained undamaged during the landing. This assurance was supported by the spacecraft’s ability to transmit telemetry, signifying the proper functionality of its equipment. The successful descent and soft landing further contributed to the preservation of the spacecraft’s capabilities.
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Importance of Data Analysis

Following the successful landing and initial data reception, the focus shifted towards comprehensive data analysis to discern crucial aspects such as the spacecraft’s orientation on the asteroid’s surface. This analysis will enable the mission team to evaluate the precision of the landing and investigate any anomalies that may have occurred during the descent and touchdown. The intricate process of data analysis holds the key to unraveling the intricacies of the spacecraft’s behavior and the conditions encountered during the landing.

Future Implications and Discoveries

The triumph of the SLIM mission’s landing and the subsequent data reception mark a significant step in the exploration of celestial bodies. The successful transmission of telemetry and the intact functionality of the spacecraft and rovers pave the way for a deeper exploration of the asteroid’s surface. This achievement sets the stage for potential groundbreaking discoveries and a wealth of scientific insights that could broaden our understanding of the solar system and beyond.


The successful landing of the SLIM spacecraft and the subsequent reception of telemetry data represent a major triumph for the JAXA mission. The prompt and reliable acquisition of data from SLIM and the tiny rovers underscores the efficiency and resilience of the mission’s components. The upcoming phase of in-depth data analysis and exploration holds immense promise for unveiling the mysteries of the asteroid’s surface and enriching our knowledge of the cosmos. As the mission progresses, the scientific community eagerly anticipates the forthcoming discoveries and insights that will emanate from the remarkable SLIM mission.


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