Space Junk Cleanup: Astroscale’s Inspection Mission

Earth’s orbit is becoming a crowded highway filled with defunct satellites and discarded rocket parts. To address this growing threat, a company called Astroscale is leading the charge with a groundbreaking mission. Their satellite, ADRAS-J, recently achieved a major milestone by successfully inspecting a large piece of space debris closely. This mission marks a critical first step toward a cleaner, safer orbital environment.

The Mission: ADRAS-J

The mission is officially titled “Active Debris Removal by Astroscale-Japan” (ADRAS-J). While the ultimate goal of space sustainability is to remove junk, you cannot remove what you do not understand. Therefore, this specific mission is purely for inspection and characterization.

Launched on February 18, 2024, aboard a Rocket Lab Electron rocket from New Zealand, the ADRAS-J satellite had a singular target. It was sent to hunt down a Japanese H-IIA upper stage rocket body. This massive piece of space junk has been floating in Low Earth Orbit since 2009, when it launched the GOSAT earth observation satellite.

The Target

The target is not a small screw or a paint chip. It is a bus-sized object with the following specifications:

  • Length: Approximately 11 meters (36 feet)
  • Diameter: 4 meters (13 feet)
  • Weight: Roughly 3 tons
  • Status: Non-cooperative

In space industry terms, “non-cooperative” means the object sends no GPS signals, has no visual markers for docking, and cannot communicate with ground control. It is simply a dead, tumbling weight moving at roughly 17,500 miles per hour.

Incredible Proximity Maneuvers

In mid-2024, Astroscale released stunning images confirming the success of their approach. The ADRAS-J satellite managed to maneuver within 50 meters of the rocket body. This is an engineering feat that requires extreme precision.

To achieve this, the satellite utilized a suite of cameras and LiDAR (Light Detection and Ranging) sensors. These sensors allowed the spacecraft to match the speed and rotation of the debris. If the ADRAS-J moved too fast, it could crash into the debris, creating thousands of new fragments. If it moved too slow, it would drift away.

During the observation phase, the satellite performed a “fly-around” maneuver. It circled the rocket body to assess its structural integrity. The data gathered answered critical questions:

  • Is the rocket body tumbling wildly or spinning on a stable axis?
  • Are the docking adapters intact?
  • Has the harsh environment of space degraded the metal significantly?

The images returned to Earth showed the rocket stage was surprisingly intact despite 15 years of exposure to solar radiation and micrometeoroids. The insulation on the exterior had darkened, but the structure remained solid.

Why Inspection Must Come Before Removal

You might wonder why they did not just grab it immediately. Attempting to capture a 3-ton spinning object without knowing its exact movement is dangerous.

The data collected by ADRAS-J acts as a blueprint for the next phase. If a service satellite tried to grab a tumbling rocket stage with a robotic arm, the momentum could easily spin the service satellite out of control. By characterizing the spin rate and axis, engineers can program the future removal satellite to match the tumble perfectly before making contact.

This approach minimizes the risk of creating a collision that would trigger the “Kessler Syndrome.” This serves as a theoretical scenario where one collision creates debris that causes further collisions, eventually making orbit unusable.

The Future: ADRAS-J2

Because of the success of this inspection mission, the Japan Aerospace Exploration Agency (JAXA) has already selected Astroscale for the next phase. This follow-up mission is known as ADRAS-J2.

The objective for ADRAS-J2 is concrete: capture and remove.

  • Target: The same H-IIA rocket body inspected by the first mission.
  • Method: The new satellite will approach the debris, match its motion, and grapple it using a robotic arm.
  • Disposal: Once captured, the satellite will use its thrusters to lower the orbit of the debris. Eventually, the rocket body will re-enter Earth’s atmosphere and burn up safely over the ocean.

This mission is slated for the 2026-2027 timeframe. It represents one of the first serious attempts to actively remove a large commercial-sized object from orbit rather than just waiting decades for it to fall naturally.

The Business of Orbital Sustainability

Astroscale is positioning itself as a leader in what is known as “On-Orbit Servicing.” As companies like SpaceX and Amazon (Project Kuiper) launch thousands of satellites, the risk of collision rises.

Astroscale is not just a research project; it is a business. They maintain headquarters in Japan with subsidiaries in the United Kingdom, the United States, France, and Israel. Their business model relies on the idea that governments and private companies will eventually pay for “tow truck” services in space to protect their billion-dollar assets.

Currently, there are over 27,000 pieces of orbital debris tracked by the Department of Defense’s global Space Surveillance Network. The work done by ADRAS-J proves that we now have the technology to find, approach, and analyze these hazards. The next step is taking out the trash.

Frequently Asked Questions

What happens if the satellite crashes into the debris? This is the worst-case scenario. A collision at orbital speeds would shatter the 3-ton rocket body into thousands of smaller pieces of shrapnel. This is why the approach was done in slow, calculated steps using autonomous safety algorithms.

Who is paying for this mission? The ADRAS-J mission was selected and funded by JAXA (Japan Aerospace Exploration Agency) as part of their Commercial Removal of Debris Demonstration program.

How long will the debris take to come down without help? Without intervention, a large object at that altitude (approx 600km) could remain in orbit for decades. During that time, it remains a constant collision hazard for other satellites and the International Space Station.

Is Astroscale the only company doing this? No, but they are among the furthest along. The European Space Agency (ESA) has commissioned a mission called ClearSpace-1, scheduled for launch around 2026. Several startups in the US are also developing tug vehicles, but Astroscale’s close-up photography of a non-cooperative target is a unique achievement as of 2024.