🔭 In testing, the Vera Rubin Observatory is already discovering 11,000 new asteroids

Currently in its testing phase, the partial commissioning of the Vera C. Rubin Observatory in Chile is already yielding impressive results, with the discovery of more than eleven thousand new asteroids. This harvest, obtained from simple startup data, perfectly illustrates the leap forward this instrument will trigger.

This observatory, still in its testing phase, now demonstrates extraordinary efficiency. Thanks to its 8.4-meter (about 27.6 feet) mirror and its gigantic camera, it can scan the entire southern sky in just a few nights. Such an observing frequency is perfect for tracking faint and fast-moving objects, clearly outperforming conventional monitoring programs.


The vast majority of these new celestial bodies are located in the main belt, between Mars and Jupiter. However, the instrument's sensitivity also enabled the identification of thirty-three near-Earth objects, relatively close to Earth, and nearly three hundred and eighty trans-Neptunian objects, which are much more distant and icy. This broad spectrum of discoveries offers a more complete representation of our system's architecture.

The ability to spot asteroids near Earth is particularly interesting for the development of planetary defense strategies. Although none of the newcomers currently poses a danger, the continuous observation promised by the observatory should make it possible to catalog a much larger proportion of these bodies, including the smallest ones. More regular monitoring will also lead to precise orbital calculations, which will improve warning capabilities.

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To identify the most distant objects, located beyond Neptune, researchers had to develop new calculation methods. Algorithms thus analyze millions of very faint light sources and test billions of potential trajectories to isolate the tiny movements.

Scientists predict that, over its ten-year mission, the observatory could uncover millions of previously unknown asteroids. This dynamic and constantly updated mapping of the sky marks the beginning of a new era for the study of the solar system.

The different families of asteroids and their significance

Asteroids are not randomly distributed in the solar system; they cluster into several distinct populations, each telling a part of the history of our cosmic neighborhood. The main belt, located between the orbits of Mars and Jupiter, is the most populous. It contains rocky and metallic bodies, remnants from the era of planetary formation that were never able to coalesce.

Near-Earth objects, or NEOs, follow trajectories that bring them close to Earth's orbit. Their study is a priority for the protection of our planet, as some could pose a collision risk. Tracking them precisely allows for calculating their orbits in the long term and assessing any potential threat decades in advance.

Much farther away, beyond the orbit of Neptune, orbit the trans-Neptunian objects. These are icy bodies, composed of water ice, methane, and ammonia, and of very variable sizes. The most famous among them is Pluto. Their distribution and orbits bear the traces of the movements of the giant planets in the youth of the solar system, and might even indicate the presence of a yet undiscovered planet, the famous "Planet Nine."

The combined study of these different populations by instruments like Rubin allows astronomers to trace the evolution of the solar system as a whole. Each family provides clues about the processes that shaped our cosmic environment, from the primordial nebula to the current configuration.