China's Tianwen-2 Reaches Kamo’oalewa After 1 Billion Kilometers, Captures First Images
Updated
Updated · WIRED · Jul 11
China's Tianwen-2 Reaches Kamo’oalewa After 1 Billion Kilometers, Captures First Images
3 articles · Updated · WIRED · Jul 11
Summary
Tianwen-2 photographed Kamo’oalewa for the first time on July 2 from about 20 kilometers away, after first detecting the quasi-moon on June 6.
The milestone capped a 400-day, roughly 1 billion-kilometer journey and positions the probe for closer observations of the asteroid’s shape, composition and internal structure.
Sample collection remains the hardest phase because Kamo’oalewa is only about 41 meters wide and spins quickly, leaving little time for stable contact on the surface.
If Tianwen-2 secures material, it plans to drop a return capsule during an Earth flyby in November 2027, potentially joining Japan’s Hayabusa missions and NASA’s OSIRIS-REx in asteroid sample return.
Those samples could also test competing theories over Kamo’oalewa’s origin, including whether it is lunar debris or an LL-chondrite body that migrated from the Flora asteroid family.
How will China's probe grab samples from a tiny, fast-spinning rubble pile without being flung back into space?
Is Earth's mysterious quasi-satellite a lost piece of the Moon or a visitor from the distant asteroid belt?
With missions to asteroids and Mars, is China building a deep-space capability that will challenge existing space powers?
Tianwen-2 at Kamoʻoalewa: China’s First Asteroid Sample Return Mission and the Quest to Unravel a Cosmic Mystery
Overview
The China National Space Administration launched Tianwen-2, which traveled 13 months and 1 billion kilometers to reach the near-Earth asteroid Kamoʻoalewa. Upon arrival, Tianwen-2 delivered its first close-up image, giving scientists their first direct look at the asteroid’s surface features. This new data may lead to revisions in our understanding of Kamoʻoalewa’s size and rotation. Since arriving, Tianwen-2 has been actively surveying the asteroid and is now preparing for more detailed scientific exploration. These steps mark important progress in China’s efforts to study and sample asteroids in deep space.