National Space Society praises China’s asteroid rendezvous mission

The National Space Society is applauding China’s successful arrival at asteroid Kamoʻoalewa as Tianwen-2 begins the sample-collection phase of a mission that could make China only the third nation to return asteroid material to Earth. The spacecraft is targeting a 2027 Earth return and a later flyby of comet 311P/PANSTARRS.

Why it matters: - China’s Tianwen-2 mission could make the country only the third nation to return samples from an asteroid, after Japan and the United States. - The mission adds to the scientific study of near-Earth objects and could improve future asteroid resource use and planetary defense planning. - Kamoʻoalewa is a small quasi-satellite of Earth, and a successful visit could set a size record for the smallest asteroid ever reached by a spacecraft.

What happened: - The National Space Society commended the China National Space Administration after Tianwen-2 reportedly arrived at asteroid 469219 Kamoʻoalewa. - Tianwen-2 launched on May 28, 2025. - The spacecraft is now positioned to begin the sample-collection phase of its deep-space mission.

The details: - Kamoʻoalewa measures about 130 to 330 feet, or 40 to 100 meters, across. - The name Kamoʻoalewa means “oscillating celestial object” in Hawaiian. - Kamoʻoalewa is often called a “mini-moon,” but it is not a true moon of Earth. - The object is one of seven known quasi-satellites that orbit the Sun while staying synchronized with Earth’s orbit. - Some astronomers think Kamoʻoalewa may be a fragment of Earth’s Moon that was blasted into space after a major impact. - Over the next nine months, Tianwen-2 will map the asteroid in high resolution to find a secure landing site. - The spacecraft will use a touch-and-go sampling system and an anchor-and-attach mechanism with surface drills to collect about 3.5 ounces, or 100 grams, of material. - If the mission succeeds, Tianwen-2 will leave the asteroid in April 2027. - The return capsule is projected to land on Earth the following November. - After sampling Kamoʻoalewa, Tianwen-2 will use a gravity-assist maneuver to head toward comet 311P/PANSTARRS. - The spacecraft is expected to arrive at the comet in January 2035. - Japan returned asteroid samples with Hayabusa 1 in 2010 and Hayabusa 2 in 2020. - The United States returned asteroid samples with OSIRIS-REx in 2023.

Between the lines: - NSS COO and SVP Dale Skran framed the mission as both a scientific milestone and a step toward using asteroid resources for future human settlement beyond Earth. - Skran also said asteroid exploration helps planners think about protecting Earth from larger asteroid impacts. - China’s progress signals that asteroid sample-return missions are becoming a broader international capability rather than a small club of spacefaring nations.

What's next: - Tianwen-2 will continue high-resolution mapping before attempting sample collection. - China is aiming for an April 2027 departure from Kamoʻoalewa and a November 2027 Earth return for the sample capsule. - The mission will then continue on to its comet target for a 2035 arrival.