• JAXA conducted a resupply mission to the ISS
  • An astronomer spotted JAXA's HTV spacecraft from Earth
  • HTV9 is the HTV spacecraft's last space mission

An astronomer was able to capture a short video of Japan’s spacecraft as it traveled across space to deliver supplies to the International Space Station (ISS). In the video, the robotic spacecraft can be seen producing a bright flash as it proceeds with its mission.

The spacecraft is officially known as the H-II Transfer Vehicle (HTV). It was developed by the Japan Aerospace Exploration Agency (JAXA) to deliver supplies to the ISS.

The HTV was recently launched by NASA on May 21 for its ninth space mission. Dubbed as HTV9, the objective of the mission is to deliver 13,600 pounds of cargo to the ISS. This includes supplies, experiments and other pieces of equipment needed by the astronauts.

JAXA’s spacecraft was captured by ISS’ robotic arm on May 25. Its payload was fully unloaded the following day.

As the HTV made its way towards the ISS, an astronomer from the Netherlands was able to observe it using his telescope. According to Ralf Vandebergh, he saw the spacecraft as it passed over the country on May 24.

In the short video he uploaded to’s gallery, the spacecraft can be seen producing a bright flash. Although the flash might seem like the result of an explosion, Vandebergh noted that it was caused by the reflection of sunlight from the spacecraft’s body.

“I used my 10-inch telescope to record this bright flare coming off the HTV9 on its way to the International Space Station,” he stated. “Sunlight briefly glinted from the HTV9's elongated body, creating an outburst of light.”

HTV9 is the final mission for JAXA’s robotic spacecraft. It will be replaced by an updated cargo vehicle known as the HTV-X. Unlike its predecessor, the HTV-X no longer needs to be captured by the ISS’ robotic arm. Instead, it can directly dock with the station just like SpaceX’s Dragon and Boeing’s Starliner capsules.

For the HTV’s final mission, NASA astronaut Chris Cassidy, the current commander of the ISS’ Expedition 63 crew, operated the robotic arm to capture the spacecraft.

“It was an honor for Expedition 63 to be part of the final HTV mission, a vehicle that has contributed so greatly to the International Space Station program,” he said, according to Spaceflight Now. Congratulations to our friends and colleagues in Tsukuba.”

JAXA's HTV9 mission to the ISS. JAXA/NASA