Tuesday, July 7Tuesday, July 7
A Chinese unmanned probe has reached asteroid 469219 Kamoʻoalewa, marking a significant milestone in the country’s deep-space exploration program. The spacecraft approached within 20 kilometres of the quasi-satellite on Sunday, according to the China National Space Administration, and is now beginning a mapping phase ahead of a sample-collection attempt.
The mission’s goal is to retrieve up to a few hundred grams of material from Kamoʻoalewa’s surface and return it to Earth for laboratory analysis. Kamoʻoalewa, roughly 40 to 100 metres across, orbits the Sun in a path that keeps it relatively close to Earth, making it a prime candidate for such a mission. Chinese state media reported that the probe will spend several weeks surveying the asteroid’s topography and composition before selecting a sampling site.
“This is the first time any nation has attempted to bring back material from Kamoʻoalewa,” said Professor Li Wei of the Beijing Institute of Space Science, a co-investigator on the mission. “The asteroid’s unusual orbit and composition make it scientifically valuable, but also technically challenging.” Kamoʻoalewa is believed to be rich in silicate minerals and may contain water-bearing compounds, offering clues to the early solar system and the delivery of volatiles to Earth.
The probe’s arrival follows a series of precise trajectory corrections over the past three months, during which mission controllers at the Xi’an Aerospace Control Centre executed five engine burns to refine its path. The final approach phase began on Saturday, with real-time navigation guided by optical and laser sensors. Chinese officials confirmed that all systems are functioning nominally and that the spacecraft is on schedule to begin surface operations within the next fortnight.
International observers welcomed the achievement. “China’s ability to reach and study such a distant and small object demonstrates the maturity of its deep-space navigation and robotic capabilities,” said Dr. Maria Antonietta Perino, director of space exploration at the Italian Space Agency. “Kamoʻoalewa is a fascinating target, and any samples returned would be a major contribution to planetary science.”
The mission is part of China’s broader plan to expand its asteroid exploration portfolio. Earlier this year, the Tianwen-2 spacecraft completed a flyby of the near-Earth asteroid 2016 HO3, and Tianwen-3 is being prepared for a Mars sample-return mission later in the decade. Kamoʻoalewa, discovered in 2016, is one of Earth’s most stable quasi-satellites, with an orbit that has remained relatively unchanged for centuries.
Scientists hope the returned material will help answer long-standing questions about the origin of Earth’s water and the role of asteroids in delivering organic molecules to our planet. The samples are expected to land in Inner Mongolia in late 2027, pending successful collection and departure from Kamoʻoalewa in early 2027.
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