Icy Eclipse: Japan’s SLIM Moon Lander Faces Demise as Freezing Lunar Night Sets In, Signaling an Uncertain Celestial Fate

Japan's upside-down SLIM moon lander wakes up on lunar surface and snaps  new photos | Space

Days after being revived from its initial power loss on the moon, Japan’s SLIM lander will now sleep through the deep cold of lunar night — and may or may not wake up afterward.

Not dead yet: Japan prepares for possible recovery of SLIM moon lander |  Space

Mosaic images of the lunar surface captured by the Multiband Spectroscopic Camera (MBC) onboard Japan’s SLIM moon lander immediately after its Jan. 19 touchdown (left) and after power was restored about 10 days later (right). As the direction of the sun changed from east to west, so did the shadows cast on the lunar surface. (Image credit: JAXA)

Japan’s historic SLIM moon lander has powered down ahead of a likely mission-ending cold lunar nighttime — but not before grabbing some final images and loads of science data.

Japan's SLIM moon lander snaps eerie photo — and it could be its last |  Mashable

SLIM, short for “Smart Lander for Investigating Moon,” nailed its precision touchdown on the rim of Shioli crater on Jan. 19, despite engine troubles that saw it land nose-down. As a result, the spacecraft’s solar cells face westward and are unable to receive the expected levels of sunlight, initially cutting operations on the lunar surface very short. But SLIM triumphantly reawakened nearly 10 days after landing, as the sun finally shone on its panels.

Near death experience — Japan's Moon lander makes a comeback

The Japan Aerospace Exploration Agency (JAXA), which operates SLIM, has spent recent days scanning the nearby lunar surface with the spacecraft’s Multi-Band Camera (MBC) to learn about its composition.

MBC is designed to scope out olivine and other minerals through analyzing the light signatures, or spectra, of reflected sunlight, according to the nonprofit Planetary Society.

Image of the lunar surface captured by Japan’s SLIM moon lander. Due to different solar radiation conditions over time, some rocks to be observed were changed and added. (Image credit: JAXA , Ritsumeikan University, University of Aizu)

Japan: Moon lander Slim comes back to life and resumes mission

JAXA’s SLIM account on X, formerly Twitter, posted a final image taken by SLIM’s navigation camera on Jan. 31 Japan time, while stating that the agency confirmed the spacecraft had entered a dormant state as expected.

JAXA will need to wait out the roughly 14.5-Earth-day-long lunar nighttime and then wait for favorable lighting and temperature conditions later in the next lunar daytime (which starts around Feb. 15) before SLIM can potentially be revived once more. For the probe to awake again, however, its electronics must hold up in the face of equatorial lunar nighttime temperatures of around minus 208 degrees Fahrenheit (minus 130 degrees Celsius).

Japan's moon lander took this eerie photo before being enveloped by lunar  night

The lunar rock “Aki Inu,” imaged in near-infrared light by the Multiband Spectroscopic Camera instrument on Japan’s SLIM moon lander after power was restored. “Aki Tainu” is 2.07 feet (63 centimeters) wide and lies 59 feet (18 meters) from SLIM. (Image credit: JAXA , Ritsumeikan University, University of Aizu)

But whether or not SLIM wakes up, the spacecraft has hit its full and extended mission goals by achieving a precision landing, deploying a pair of small rovers and demonstrating their interoperability, and obtaining a wealth of science data.

Japan's upside-down SLIM moon lander wakes up on lunar surface and snaps  new photos | Space

SLIM’s X account also posted labeled images of targets of MBC’s spectroscopic imaging, showing the various rocks and regolith that are being studied.

“Based on the large amount of data we have obtained, we are proceeding with analyses to identify rocks and estimate the chemical composition of minerals, which will help solve the mystery of the origin of the moon,” a Google machine translation of a Feb. 1 JAXA statement read.

“We will announce scientific results as soon as they are obtained,” the statement added.


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