Astronomers Discover Fast-Moving Skyscraper-Sized Asteroid

Astronomers have made a significant discovery in our solar system with the identification of a large asteroid named 2025 SC79, which orbits the sun at an impressive speed. This celestial body completes its journey around the sun every 128 days, making it the second-fastest known asteroid, according to a statement from Carnegie Science.

Discovered by Scott S. Sheppard on September 27, 2023, 2025 SC79 crosses the orbit of Mercury during its rapid journey. This discovery not only contributes to our understanding of potential threats to Earth but also sheds light on the history of our solar system.

Understanding Asteroid Dynamics

Scott S. Sheppard highlighted the significance of such discoveries, stating, “Many of the solar system’s asteroids inhabit one of two belts of space rocks, but perturbations can send objects careening into closer orbits where they can be more challenging to spot.” By studying how these asteroids arrived at their current positions, astronomers can better protect our planet from potential impacts and learn more about the solar system’s evolution.

2025 SC79 is notable for being the second known object with an orbit that lies within the orbit of Venus. Its trajectory will take it behind the sun, rendering it invisible to telescopes for several months.

Efforts in Planetary Defense

Sheppard’s research, which is partially funded by NASA, is focused on identifying “twilight” asteroids—objects that could pose risks to Earth. His team employs the Dark Energy Camera on the National Science Foundation’s Blanco 4-meter telescope to search for these “planet killer” asteroids that might be difficult to detect due to the sun’s glare. The discovery of 2025 SC79 was confirmed using the Gemini telescope and Magellan telescopes.

The fastest known asteroid, which also holds the record for the quickest orbit, was discovered by Sheppard and his team in 2021. This asteroid completes its orbit in just 133 days, further underscoring the dynamic nature of these celestial bodies.

As research continues, the study of such fast-moving asteroids not only aids in planetary defense strategies but also enriches our understanding of the solar system’s complexities.