Fast Facts
- Hera has spotted Dimorphos separately from its larger companion Didymos for the first time—an important milestone as it closes in.
- The spacecraft is approaching carefully: after two speed-reducing maneuvers, it was about 1,280 km from the asteroids when it captured the image.
- Hera will investigate NASA’s 2022 DART impact, which changed Dimorphos’s orbit more than expected and left key questions about the asteroid unanswered.
- Close-up studies, CubeSats and eventual landing operations will help scientists understand asteroid impacts and improve future planetary-defense plans.
A distant pair comes into focus
Hera has captured its first image of Didymos and its smaller companion, Dimorphos, as two separate objects. The European spacecraft took the black-and-white image from about 1,280 kilometers away. At the time, the pair sat roughly 197 million kilometers from Earth.
Dimorphos appears as only a pixel, yet the image marks a key step. Earlier, the asteroids looked like one point of light. Hera’s cameras should reveal more as it approaches.
DART changed the orbit. Questions remain.
In 2022, NASA’s DART spacecraft struck Dimorphos at about 6.1 kilometers per second. The impact shortened the asteroid’s orbit around Didymos by roughly 33 minutes and sent debris streaming into space.
That result showed a spacecraft can change an asteroid’s motion. Still, the change exceeded scientists’ predictions. They do not yet know the full shape of the impact site or how Dimorphos’ structure helped produce the result. One successful test, therefore, does not guarantee every future deflection will work the same way.
Hera will help turn a test into a tool
Hera will study the collision site and measure the asteroids’ mass, structure and composition. It will also deploy two shoebox-size CubeSats for close-up observations.
Those findings can sharpen predictions for future missions. However, planetary defense depends on understanding each asteroid, not simply repeating one impact. Better measurements offer a more reliable starting point.
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