China’s Tianwen-2 spacecraft has reached the quasi-moon Kamo’oalewa, positioning itself within 12.5 miles of the asteroid’s surface to begin a year-long data collection and sampling mission. According to Space.com and state-run outlet Xinhua, the mission marks the first time a world power has approached this specific celestial object, utilizing an innovative “anchor-and-attach” sampling technique.
The Technical Challenge of Targeting Kamo’oalewa
Kamo’oalewa presents a unique target. First identified by a Hawaiian survey telescope in April 2016, the object is one of seven known quasi-moons—objects which circle the Earth but are too far to be considered a capital-M Moon. Its small size, estimated at only a few dozen feet in diameter, complicates precision navigation.
The primary obstacle for the nearly two-ton Tianwen-2 probe is the asteroid’s rotation. According to reports, the rock rotates once roughly every half hour of Earth time. This rapid movement requires the spacecraft to perform extremely delicate maneuvers to avoid knocking Kamo’oalewa even slightly off course.
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Cristina Thomas, a planetary scientist at Northern Arizona University, noted that Kamo’oalewa is the smallest object that humans have visited with a spacecraft.
Sampling Methods: Anchor-and-Attach vs. Touch-and-Go
If successful, China will become the third country to successfully pull a sample from an asteroid. While previous missions have utilized “touch-and-go” methods, China could be the first to do so using the “anchor-and-attach” technique. This involves the spacecraft securing itself to the quasi-moon before utilizing an ultrasonic drill to bore into it.
The mission follows a 620-million-mile journey that took approximately 400 days. The probe is currently tasked with the better part of a year riding side-by-side with the space rock to acquire data on its composition and structure before the sampling phase begins.
Strategic Expansion of China’s Space Program
The Tianwen-2 mission represents a shift toward more complex, far-flung space initiatives. Beyond the construction of its own orbital space station and the development of reusable rocket boosters, China is increasingly focusing on deep-space exploration and small-body dynamics. This mission serves as a testbed for the dexterity required to operate in proximity to smaller, faster-moving celestial targets.
Keep an eye on China’s progress regarding small-body exploration.
Frequently Asked Questions
- What is a quasi-moon? It is an object which circles the Earth but is too far to be considered a capital-M Moon.
- Why is the “anchor-and-attach” method important? It allows the spacecraft to secure itself to the quasi-moon before using an ultrasonic drill to bore into it.
- How long will the mission last? The Tianwen-2 probe is scheduled to spend the better part of a year riding side-by-side with Kamo’oalewa.
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