Japan's 1st HTV-X cargo craft leaves the International Space Station (photo)

a cylindrical golden spacecraft with a pair of long, rectangular solar arrays extended is seen from above with earth in the background — Japan’s HTV-X1 cargo spacecraft departs the International Space Station after its release from the Canadarm2 robotic arm on March 6, 2026. (Image credit: NASA+)

Japan's new HTV-X cargo spacecraft departed the International Space Station today (March 6) after a four-month stay.

The vehicle — known as HTV-X1, because it's the first of its kind — was released by the station's Canadarm2 robotic arm today at 12 p.m. EST (1700 GMT), right on schedule.

closeup of a golden cylindrical spacecraft with earth in the background — The HTV‑X1 cargo spacecraft is pictured on Oct. 29, 2025, after its capture by the International Space Station’s Canadarm2 robotic arm. (Image credit: NASA)

The robotic HTV-X is the successor to Japan's H-II Transfer Vehicle (HTV), which flew nine cargo missions to the International Space Station (ISS) from 2009 to 2020.

The new freighter launched for the first time on Oct. 25, carrying about 9,000 pounds (4,080 kilograms) of food and other supplies to the orbiting lab. On Oct. 28, HTV-X1 reached its destination, where it was grappled by Canadarm2 and affixed to the station's Harmony module.

The arm removed the vehicle from the module on Thursday (March 5), then began positioning it for today's release.

HTV-X1 will now stay up for a while as a free flyer.

"The HTV-X1 spacecraft will remain in orbit for more than three months acting as a scientific platform for JAXA’s experiments," NASA officials said in an update on Monday (March 2), referring to the Japan Aerospace Exploration Agency.

"Following the deorbit command, the spacecraft will dispose of several thousand pounds of trash during reentry into Earth's atmosphere, where it will burn up harmlessly," they added.

Three other freighters haul cargo up to the ISS these days as well — Russia's Progress vehicle, Northrop Grumman's Cygnus, and Dragon, which is built by SpaceX. Dragon is the only one that's reusable.

Editor's note: This story was updated at 1:15 p.m. ET on March 6 with the news of HTV-X1's departure from the ISS.

Michael Wall is a Senior Space Writer with Space.com and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.