Humanity has for the first time reconfigured the orbits of celestial bodies, and the solar system will no longer remain as it was.

Brief Event Description

In September 2022, NASA’s DART (Double Asteroid Redirection Test) spacecraft was launched with the goal of demonstrating the ability to deflect an asteroid using a kinetic impact. The mission aimed to deliberately collide with Dimorph‑Diddim’s secondary body.

1. What Happened
* Vehicle mass – about 570 kg
* Entry speed – over 22,500 km/h
* Target – Dimorph asteroid, the satellite of the larger Diddim body

After impact, Dimorph’s orbital period around Diddim shortened by roughly 33 minutes, far exceeding the initially predicted 7–10 minutes. This was due to additional momentum transferred during debris ejection.

2. Impact on Heliocentric Orbit
A new study based on multiple observations showed that the DART hit not only altered the internal orbital configuration of the pair but also affected the heliocentric trajectory of the entire Dimorph‑Diddim system.

* Speed reduction – 11.7 ± 1.3 µm/s (≈ 42 mm/h)
* Orbital period shortened by fractions of a second (pre‑impact period was 770 days)
* Orbit radius decreased from 0.72 to 2.36 km
* Accumulated shift over a decade – about 3.69 km

Thus, the system’s orbit began contracting toward the Sun and gradually moving closer to Earth.

3. Data Confirmation
Results were verified using an extensive set of measurements:

Statistical analysis showed high reliability. Part of the impact’s momentum and debris ejection was transferred to the pair’s center of mass, causing the observed deviation in its heliocentric path.

4. Significance for Planetary Defense
* Proof of kinetic‑impact effectiveness – orbit control of asteroid systems around the Sun is feasible.
* Early threat detection allows small trajectory adjustments that can prevent Earth impacts.

5. Future Research
ESA’s Hera mission will arrive at the system by the late 2020s to conduct detailed studies:

* Impact crater
* Remaining debris post‑collision
* Asteroid structures and composition

The data obtained will refine impact‑response mathematical models and improve planetary defense strategies.