On the Month of July 6th 2026, After approximately 400 days and 1 billion kilometers of flight, the CNSA – China National Space Administration – CLEP Tianwen-2 probe successfully rendezvoused with Earth’s quasi-satellite 2016HO3 in early July 2026. At a distance of 20 kilometers, it began scientific exploration and transmitted back heart-shaped images, earning praise from the media as “textbook-level deep-space piloting.” Subsequently, it will conduct multi-mode sampling and plans to return the samples to Earth by the end of 2027. Afterward, it will fly to the main-belt comet 311P to carry out a decade-long extended exploration..
I. Latest progress and key milestones of the mission
- Successful rendezvous : In early July 2026, the Tianwen-2 probe successfully rendezvoused with asteroid 2016HO3 at a distance of about 20 kilometers, officially commencing scientific exploration.
- First capture : On June 6, 2026, the probe captured images of the asteroid for the first time from a distance of about 30,000 kilometers.
- Coplanar flight : On June 7, capture control was implemented at an altitude of 30,000 kilometers, achieving coplanar flight with the asteroid’s orbit.@Kaldarwalich25
- Autonomous navigation : On June 19, it switched to fully autonomous navigation mode at a distance of 2000 kilometers.
II. Comparison of Key Engineering Data
| project | Specific values |
| Total flight time | Approximately 400 days |
| Total flight distance | Approximately 1 billion kilometers |
| Current distance from the asteroid | 20 kilometers |
| Target asteroid diameter | 40-100 meters |
| asteroid rotation period | Approximately 28 minutes |
| Improved navigation accuracy | The error was reduced from hundreds of kilometers to the kilometer level. |
III. Key Features of the Target Asteroid 2016HO3
- Identity : Earth quasi-satellite, also known as Kamoʻoalewa, permanent number 469219.
- Origin hypothesis : It may be lunar impact debris or a main belt captured celestial body, which has extremely high scientific research value.
- Physical characteristics : An S-type silicate asteroid with a surface covered in gravelly rock fragments. In a microgravity environment, the probe needs to autonomously fly alongside it rather than fly around it
IV. Planning for the Next Two Steps
1. Detailed Exploration and Sampling (July 2026 – April 2027)
- Gradually approaching : advancing from 20 kilometers, 3 kilometers to 300 meters, to conduct morphological, compositional, and internal structure detection.
- Sampling methods : Three modes will be used: touch-and-go, hovering robotic arm, and world’s first anchored drilling. The plan is to collect at least 100 grams of sample.
- Sample return : The return capsule is expected to re-enter the atmosphere at a speed of approximately 12 km/s and land on Earth by the end of 2027.13
2. Fly to main-belt comet 311P (after 2027)
- Gravity slingshot : The main probe uses Earth’s gravity to accelerate and turn towards the main-belt comet 311P, which lies between Mars and Jupiter.
- Exploration period : Approximately 7 years in total, with a total mission duration of approximately 10 years. The focus is on studying comet ejecta, internal structure, and the distribution of water ice in the early solar system.10
V. Focus of Public Opinion
- “Textbook-level deep space driving” : The public and media highly praised its step-by-step autonomous navigation, error compression, and precise microgravity control.@ArmorResearcher2
- “A Cosmic Heart” : The first images transmitted back by the probe showed that the asteroid’s outline was heart-shaped, sparking widespread discussion..
- China-Japan comparison discussion : Some users compared it with Japan’s Hayabusa2 mission, emphasizing that Tianwen-2 is more technically challenging.
- Distinguishing between accompanying and orbiting : Science bloggers point out that because the asteroid’s gravity is extremely weak, Tianwen-2 is actually “accompanying” rather than “orbiting”
Images and visuals are from their Respectives CMS China Manned SpaceCNSA-China National Space Administration