Astroscale: The Company Cleaning Up Earth's Orbital Debris Problem In the spring of 2013, a Japanese entrepreneur named Mitsunobu Okada registered a small company in Singapore with an audacious idea: build spacecraft to remove junk from orbit. At the time, no one had done it. No government agency had cracked the engineering. No private company had tried to commercialize it. The problem was real, growing, and almost universally acknowledged as someone else's job to fix. Okada, who goes by Nobu, did not wait for someone else. He founded Astroscale with the conviction that orbital sustainability was not a policy problem waiting for a treaty, but an engineering problem waiting for a business model. Thirteen years later, his company has raised over $500 million , listed on the Tokyo Stock Exchange, employed more than 400 people across six countries, and completed the world's first rendezvous with uncooperative debris in Earth orbit. The race to clean up space has a frontrunner, and it is headquartered in Tokyo. AI-generated image Artist's conception of an Astroscale servicing spacecraft approaching a defunct satellite in low Earth orbit. Credit: AI-generated $500M+ Total Capital Raised 400+ Employees Worldwide 186A Tokyo Stock Exchange (TSE) 2013 Founded in Singapore 15m Closest Approach to Debris (Dec 2024) 10+ Space and Defense Agency Clients Origins and the Debris Problem The problem Astroscale was founded to solve is not hypothetical. As of 2024, there are roughly 27,000 tracked objects in Earth orbit larger than a softball, with millions more smaller fragments moving at speeds up to 28,000 kilometers per hour. A single defunct rocket body or dead satellite can generate hundreds of thousands of fragments if struck. Those fragments threaten the satellites that underpin GPS navigation, weather forecasting, telecommunications, and financial transactions. The problem compounds on itself: debris creates more debris, a cascading failure scenario that orbital mechanics researchers call Kessler Syndrome . Nobu Okada was not an aerospace engineer when he started Astroscale. He was a software entrepreneur and management consultant who had spent years in finance and technology. What he saw was a market failure: the people who put objects in orbit had no mechanism to take them down, no regulatory mandate strong enough to force action, and no commercial service available to help even if they wanted it. He believed he could build that service. Astroscale was incorporated on May 4, 2013 , in Singapore, with a team that initially fit in a single room. The company later moved its headquarters to Tokyo, where it now operates its primary engineering facilities. Regional offices in Harwell, UK; Denver, Colorado; and Rehovot, Israel support mission operations, business development, and technology development. A Luxembourg office handles European regulatory and commercial work. The Kessler Problem Named after NASA scientist Donald Kessler, who described it in 1978, the Kessler Syndrome describes a self-sustaining collision cascade in which the density of objects in orbit reaches a critical threshold where collisions produce enough new debris to cause further collisions. At that point, certain orbital shells become permanently unusable. Active debris removal is the only known countermeasure. The company's early fundraising was modest, but it built steadily. Between 2013 and 2023, Astroscale raised approximately $384 million across 12 rounds, from Series A through Series G. Investors included JAFCO, SBI Investment, and a range of government-affiliated funds and strategic partners in Japan, the United Kingdom, and the United States. The funding trajectory reflected growing institutional acceptance that active debris removal was a real business, not just a public good. The IPO validated that view. On June 5, 2024 , Astroscale listed on the Tokyo Stock Exchange Growth Market under ticker 186A . The company raised approximately 21.2 billion yen (roughly $153 million USD) at an issue price of 850 yen per share. On debut, shares opened at 1,281 yen, a 51 percent premium, valuing the company at approximately one billion dollars. Total capital raised across private and public rounds exceeded $500 million. Mission Architecture and Technology Astroscale organizes its work into two broad categories: end-of-life services , which bring defunct satellites and rocket bodies out of orbit, and life extension services , which refuel or otherwise sustain operational spacecraft. Both require the same foundational capability: the ability to find a spacecraft in orbit, approach it safely, and either dock with it or otherwise interact with it. That capability, known in the industry as RPOD (Rendezvous, Proximity Operations, and Docking), is the hardest part of on-orbit servicing. Objects in orbit move fast and tumble unpredictably. A debris removal spacecraft must match velocity with its target, station-keep at close range, and then physically connect, all without human intervention and with communications delays that prevent real-time ground control. The Docking Plate System For cooperative targets, meaning satellites whose operators have agreed to deorbit services in advance, Astroscale developed a docking plate system. The plate is a ferromagnetic interface installed on a client satellite before launch. When the Astroscale servicer approaches, it uses a magnetic capture mechanism to latch on without requiring precise alignment or mechanical contact with unprepared surfaces. The approach is elegant in its simplicity: retrofit the client, not the servicer. This system was validated on the ELSA-d (End-of-Life Services by Astroscale, demonstration) mission, launched in March 2021. ELSA-d comprised a servicer spacecraft and a small client satellite with a docking plate installed. Over a series of on-orbit demonstrations, the servicer successfully captured, released, and recaptured the client satellite multiple times, including in a tumbling configuration. No one had done that before in orbit. AI-generated image Artist's conception of a spacecraft capture mechanism during proximity operations with orbital debris. Credit: AI-generated Approaching Uncooperative Targets The harder problem is uncooperative debris: rocket bodies and dead satellites that were never equipped with docking plates and may be tumbling. These objects represent the majority of the large debris population. To service them, Astroscale developed a separate sensor and software suite capable of characterizing an object's tumble rate, surface geometry, and structural state from a safe distance before attempting any contact. The ADRAS-J mission (discussed in detail below) demonstrated this capability at a scale and proximity never previously achieved. Longer term, the company is developing robotic arm systems capable of physically grasping debris objects, a technology that will be central to ADRAS-J2 and future large-debris removal missions. • RPOD Software: Custom guidance, navigation, and control algorithms for autonomous rendezvous and station-keeping. • Magnetic Capture: Ferromagnetic docking plate system for cooperative client satellites, validated on ELSA-d. • Vision and LIDAR Sensors: Multi-spectral imaging and ranging for characterizing tumbling objects at distance. • Robotic Arm (in development): Mechanical grasping for uncooperative debris, central to ADRAS-J2 and ELSA-M Phase 2. • Propulsion: Electric and chemical propulsion depending on mission profile, optimized for delta-v budget and mission duration. ADRAS-J and ELSA-M: The Missions That Matter Two missions define Astroscale's near-term operational credibility, and both are making history. ADRAS-J: The World's First Approach to Uncooperative Debris ADRAS-J (Active Debris Removal by Astroscale-Japan) launched on February 18, 2024, aboard a Rocket Lab Electron rocket from New Zealand. The mission was contracted by JAXA, Japan's space agency, as the first phase of Japan's