China's Tianwen-2 Reaches 39.1 Million-Km Quasi-Moon for 100-Gram Sample Mission
Updated
Updated · Livescience.com · Jun 17
China's Tianwen-2 Reaches 39.1 Million-Km Quasi-Moon for 100-Gram Sample Mission
2 articles · Updated · Livescience.com · Jun 17
Summary
Tianwen-2 has arrived at 469219 Kamo'oalewa, a small near-Earth quasi-moon, and is expected to attempt a sample collection on July 4 before returning material to Earth in November 2027.
The car-sized probe will first map the asteroid from 300 meters to 20 kilometers above the surface to pick a landing site and estimate density, then try to gather about 100 grams of regolith.
If Kamo'oalewa is a rubble pile, China can use a touch-and-go grab; if it is solid, Tianwen-2 may attempt a direct landing and anchored drilling technique not yet demonstrated on an asteroid.
Scientists see the mission as a test of whether the 40- to 100-meter object is lunar debris rather than a main-belt asteroid, a debate fueled by 2021 spectral data and a 2024 study linking it to the Moon's Giordano Bruno crater.
Beyond settling Kamo'oalewa's origin, the samples could aid asteroid-defense research and future deep-space operations before Tianwen-2 heads on to study 311P/PanSTARRS in 2035.
Could the secrets inside this tiny 'quasi-moon' hold the key to defending Earth from a future killer asteroid?
If samples prove Kamo'oalewa isn't from our Moon, was this ambitious mission a scientific miscalculation?
Is China's new asteroid-drilling technology secretly paving the way for a commercial space mining race?
Tianwen-2 and Kamoʻoalewa: China’s Ambitious Asteroid Sample Return and Extended Comet Exploration Mission
Overview
As of June 2026, the Tianwen-2 mission has successfully entered orbit around the near-Earth asteroid Kamoʻoalewa, marking the start of a crucial phase of close-proximity studies. Kamoʻoalewa is a small, poorly understood body with microgravity, making it difficult for the spacecraft to maintain a stable orbit. Its exact shape and rotation are still unknown, and scientists suspect it rotates rapidly. These uncertainties create significant challenges for the upcoming sample collection, requiring the mission to adapt to an unpredictable environment to successfully retrieve material and achieve its scientific goals.