2025 SC79 travels entirely inside Venus’s orbit and crosses Mercury’s path at closest approach, a region of space that remains largely uncharted. Follow-up imaging with the NSF’s Gemini and Carnegie’s Magellan telescopes confirmed the detection and refined its orbit.

The team used short observing windows at dusk and dawn to survey sky regions near the Sun where most asteroid searches cannot operate. Sheppard refers to these targets as “twilight asteroids,” highlighting the difficulty of detecting them against the bright background. 2025 SC79 appeared as a fast-moving point of light shifting against the stars across consecutive images.

Calculations show no near-term encounters with Earth, but the discovery strengthens efforts to chart inner-system bodies hidden from standard sky surveys. Sheppard’s programme, supported in part by NASA, has uncovered several near-Sun asteroids in recent years, including 2021 PH27, which completes an orbit in 113 days, and 2025 GN1, a related object with a similar inner-orbit track.

Asteroids that travel close to the Sun experience extreme temperature changes that fracture surface rock and gradually alter their rotation. Studying these objects helps scientists understand how heat, radiation, and orbital dynamics shape small bodies and move debris inward from the main belt. Deep imaging combined with rapid follow-up at multiple telescopes is now a key approach for confirming such discoveries.

Carnegie Science describes 2025 SC79 as an important addition to the growing catalogue of inner-Venus asteroids. Although discovered nearly a month earlier, the release reflects ongoing analysis to secure its orbit and confirm its characteristics. With a year lasting just over four months, the asteroid extends knowledge of how small bodies behave under the most intense solar conditions.