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Japan becomes the fifth nation to land a spacecraft on the Moon

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Artist's illustration of the SLIM spacecraft on final descent to the Moon.

Enlarge / Artist’s illustration of the SLIM spacecraft on final descent to the Moon.

The Japanese space agency’s first lunar lander arrived on the the Moon’s surface Friday, but a power system problem threatens to cut short its mission.

Japan’s robotic Smart Lander for Investigating Moon (SLIM) mission began a 20-minute final descent using two hydrazine-fueled engines to drop out of orbit. After holding to hover at 500 meters and then 50 meters altitude, SLIM pulsed its engines to fine-tune its vertical descent before touching down at 10: 20 am EST (15: 20 UTC).

The Japan Aerospace Exploration Agency (JAXA), which manages the SLIM mission, streamed the landing live on YouTube. About two hours after the touchdown, JAXA officials held a press conference to confirm the spacecraft made a successful landing, apparently quite close to its target. SLIM aimed to settle onto the lunar surface adjacent to a nearly 900-foot (270-meter) crater named Shioli, located in a region called the Sea of Nectar on the near side of the Moon.

But ground controllers at JAXA’s Sagamihara Campus in the western suburbs of Tokyo soon discovered the lander was in trouble. Its solar array was not generating electricity after landing, and without power, officials expected SLIM to drain its battery within a few hours.

In what could be the mission’s final hours, engineers prioritized downloading data from SLIM, including imagery taken during its descent, and potentially new pictures captured from the lunar surface. Official reported good communications links between SLIM and ground stations on Earth.

“Minimum success”

Even if SLIM falls silent, the mission has achieved its minimum success criteria, JAXA said. The SLIM mission is a technology demonstrator developed to verify the performance of a new vision-based navigation system needed for precision Moon landings.

“First and foremost, landing was made and communication was established,” said Hiroshi Yamakawa, JAXA’s president. “So a minimum success was made in my view.”

One of the core goals of the SLIM mission was to land within 100 meters (about 330 feet) of its bullseye. This accomplishment would be a remarkable improvement in lunar landing precision, which typically is measured in miles or kilometers. It would also be an enabling capability for future Moon missions because it lays the foundation for future spacecraft to land closer to lunar resources, such as water ice.

Hitoshi Kuninaka, director general of JAXA’s Institute of Space and Astronautical Science, said it will take about a month for engineers to fully analyze data from SLIM and determine the precision of the landing.

“But as you saw on the real-time data livestream, SLIM did trace the expected course, so my personal impression is that we probably have been able to more or less achieve a high precision landing within 100-meter accuracy,” Kuninaka said. “So the solar cell state is unlikely to impact the full success criteria.”

Kuninaka said ground teams have seen no evidence of any damage to the solar array on SLIM. It’s possible the lander is sitting in an orientation with its solar cells facing away from the Sun. All other components of SLIM, including its propulsion, thermal, and communication systems, all appear to be functioning well.

SLIM launched September 6 on top of a Japanese H-IIA rocket, riding to orbit alongside an X-ray astronomy telescope. The spacecraft took a long route to get to the Moon, trading time for fuel to preserve propellant for Friday’s landing attempt. SLIM entered orbit around the Moon on December 25, then completed several maneuvers to settle into a low-altitude orbit in preparation for the descent to the surface.

A milestone moment for Japan

The landing of SLIM made Japan the fifth country to soft-land a spacecraft on the Moon, following the Soviet Union, the United States, China, and India. But landing on the Moon is a hazardous thing to do. Three commercial landers similar in scale to SLIM failed to safely reach the lunar surface over the last five years.

One of those was developed by a Japanese company called ispace. Most recently, the US company Astrobotic attempted to send its Peregrine lander to the Moon, but a propellant leak cut short the mission. After looping more than 200,000 miles into space, Peregrine reentered Earth’s atmosphere Wednesday, where it was expected to burn up 10 days after its launch.

A Russian lander crashed into the Moon in August, and India’s first lunar lander failed in 2019. India tried again last year and made history when Chandrayaan 3 safely landed.

This artist's illustration shows the SLIM spacecraft descending toward the Moon and ejecting two deployable robots onto the lunar surface.

Enlarge / This artist’s illustration shows the SLIM spacecraft descending toward the Moon and ejecting two deployable robots onto the lunar surface.

Japan’s SLIM mission was primarily designed to test out new guidance algorithms and sensors, rather than pursuing scientific objectives. The technologies riding to the Moon on SLIM could be used on future spacecraft bound for the Moon. SLIM cost the Japanese government approximately 18 billion yen ($121 million) to design, develop, and build, according to JAXA.

The spacecraft is modest in size, measuring nearly 8 feet (2.4 meters) tall and nearly 9 feet (2.7 meters) across. Without propellant in its tanks, SLIM has a mass of roughly 660 pounds (200 kilograms).

“The start of the deceleration to the landing on the Moon’s surface is expected to be a breathless, numbing 20 minutes of terror!” said Kushiki Kenji, sub-project manager for the SLIM mission, before the landing.

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ULA’s Vulcan rocket shot for the Moon on debut launch—and hit a bullseye

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The first Vulcan rocket fires off its launch pad in Florida.

Enlarge / The first Vulcan rocket fires off its launch pad in Florida.

United Launch Alliance

CAPE CANAVERAL, Florida—Right out of the gate, United Launch Alliance’s new Vulcan rocket chased perfection.

The Vulcan launcher hit its marks after lifting off from Florida’s Space Coast for the first time early Monday, successfully deploying a commercial robotic lander on a journey to the Moon and keeping ULA’s unblemished success record intact.

“Yeehaw! I am so thrilled, I can’t tell you how much!” exclaimed Tory Bruno, ULA’s president and CEO, shortly after Vulcan’s departure from Cape Canaveral. “I am so proud of this team. Oh my gosh, this has been years of hard work. So far, this has been an absolutely beautiful mission.”

This was a pivotal moment for ULA, a 50-50 joint venture between Boeing and Lockheed Martin. The Vulcan rocket will replace ULA’s mainstay rockets, the Atlas V and Delta IV, with lineages dating back to the dawn of the Space Age. ULA has contracts for more than 70 Vulcan missions in its backlog, primarily for the US military and Amazon’s Project Kuiper broadband network.

The Vulcan rocket lived up to the moment Monday. It took nearly a decade for ULA to develop it, some four years longer than anticipated, but the first flight took off at the opening of the launch window on the first launch attempt.

Standing 202 feet (61.6 meters) tall, the Vulcan rocket ignited its two BE-4 main engines in the final seconds of a smooth countdown. A few moments later, two strap-on solid rocket boosters flashed to life to propel the Vulcan rocket off its launch pad at 2: 18 am EST (07: 18 UTC).

On the money

The BE-4 engines and solid-fueled boosters combined to generate more than 2 million pounds of thrust, vaulting Vulcan off the launch pad and through a thin cloud layer. A little over a minute after launch, Vulcan accelerated faster than the speed of sound, then jettisoned its strap-on boosters to fall into the Atlantic Ocean.

Then it was all BE-4. Each of these engines can produce more than a half-million pounds of thrust, consuming a mixture of liquified natural gas—essentially methane—and liquid oxygen. They are built by Blue Origin, the space company founded by billionaire Jeff Bezos. This was the first time BE-4s have flown on a rocket.

Rob Gagnon, ULA’s telemetry commentator, calmly called out mission milestones. “BE-4s continue to operate nominally… Vehicle is continuing to fly down the center of the range track, everything looking good… Nice and smooth operation of the booster.”

The BE-4s fired for five minutes, then shut down to allow Vulcan’s first stage booster to fall away from the rocket’s hydrogen-fueled Centaur upper stage. Two RL10 engines ignited to continue the push into orbit, then switched off as the upper stage coasted over the Atlantic and Africa. A restart of the Centaur upper stage 43 minutes into the flight gave the rocket enough velocity to send Astrobotic’s Peregrine lunar lander toward the Moon.

The nearly 1.5-ton spacecraft separated from Vulcan’s Centaur upper stage around 50 minutes after liftoff. “We have spacecraft separation, right on time,” Gagnon announced.

With Astrobotic’s lander deployed, a third engine firing on the Centaur upper stage moved the rocket off its Moon-bound trajectory and onto a course into heliocentric orbit. “We have now achieved Earth escape,” Gagnon said.

The spent rocket stage will become a human-made artificial satellite of the Sun. A plate on the side of the Centaur upper stage contains small capsules holding the cremated remains of more than 200 people, a “memorial spaceflight” arranged by a Houston-based private company named Celestis.

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Navajo objection to flying human ashes to the Moon won’t delay launch

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The Moon sets over sandstone formations on the Navajo Nation.

Enlarge / The Moon sets over sandstone formations on the Navajo Nation.

Science instruments aren’t the only things hitching a ride to the Moon on a commercial lunar lander ready for launch Monday. Two companies specializing in “space burials” are sending cremated human remains to the Moon, and this doesn’t sit well with the Navajo Nation.

The Navajo people, one of the nation’s largest Indigenous groups, hold the Moon sacred, and putting human remains on the lunar surface amounts to desecration, according to Navajo Nation President Buu Nygren.

“The sacredness of the Moon is deeply embedded in the spirituality and heritage of many Indigenous cultures, including our own,” Nygren said in a statement. “The placement of human remains on the Moon is a profound desecration of this celestial body revered by our people.”

Last month, Nygren wrote a letter to NASA and the Department of Transportation, which licenses commercial space launches, requesting a postponement of the flight to the Moon. The human remains in question are mounted to the robotic Peregrine lander, built and owned by a Pittsburgh-based company named Astrobotic, poised for liftoff from Cape Canaveral Space Force Station in Florida on top of United Launch Alliance’s Vulcan rocket.

This is the second time a US spacecraft has gone to the Moon with human remains aboard. In 1998, NASA’s Lunar Prospector mission launched with a small capsule containing the ashes of Eugene Shoemaker, a pioneer in planetary geology. NASA intentionally crashed spacecraft into the Moon in 1999, leaving Shoemaker’s ashes permanently on the surface.

At that time, officials from the Navajo Nation objected to the scattering of Shoemaker’s ashes on the Moon. NASA promised to consult with tribal officials before another spacecraft flew to the Moon with human remains. A big part of Nygren’s recent complaint was the lack of dialogue on the matter before this mission.

“This act disregards past agreements and promises of respect and consultation between NASA and the Navajo Nation, notably following the Lunar Prospector mission in 1998,” Nygren said in a statement. He added that the request for consultation is “rooted in a desire to ensure that our cultural practices, especially those related to the Moon and the treatment of the deceased, are respected.”

An oversight

Officials from the White House and NASA met with Nygren on Friday to discuss his concerns. Speaking with reporters after the meeting, Nygren said he believes it was an oversight that federal officials didn’t meet with the Navajo Nation at an earlier stage.

“I think being able to consult into the future is one of the things that they’re going to try to work on,” he told reporters Friday. While Nygren said that was good to hear, “we were given no reassurance that the human remains were not going to be transported to the Moon on Monday.”

Removing the human remains would delay the launch at least several weeks. It would require removing Astrobotic’s lunar lander from the top of the Vulcan rocket, taking it back to a clean room facility, and opening the payload fairing to provide access to the spacecraft.

“They’re not going to remove the human remains and keep them here on Earth where they were created, but instead, we were just told that a mistake has happened, we’re sorry, into the future we’re going to try to consult with you,” Nygren said.

“We take concerns expressed from the Navajo Nation very, very seriously,” said Joel Kearns, deputy associate administrator for exploration in NASA’s science directorate. “And we think we’re going to be continuing this conversation.”

Buu Nygren, president of the Navajo Nation.

Enlarge / Buu Nygren, president of the Navajo Nation.

Astrobotic’s mission is different from Lunar Prospector in one important sense. The Peregrine lander is privately owned, while Lunar Prospector was a government spacecraft. NASA has a $108 million contract with Astrobotic to deliver the agency’s science payloads to the Moon as a commercial service. Astrobotic’s mission is the first time a US company will attempt to land a commercial spacecraft on the Moon.

While Nygren argues that NASA’s role as Astrobotic’s anchor customer should give the agency some influence over decision-making, the government’s only legal authority in overseeing the mission is through the Federal Aviation Administration.

The FAA is responsible for ensuring commercial launches, like the Vulcan rocket flight Monday, don’t put public safety at risk. The launch licensing process also includes an FAA review to ensure a launch would not jeopardize US national security, foreign policy interests, or international obligations.

“For our own missions … NASA works to be very mindful of potential concerns for any work that we’ll do on the Moon,” Kearns said. “In this particular case … NASA really doesn’t have involvement or oversight.”

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