# Astronomers Identify Potential New Dwarf Planet 2026 ED138 Researchers utilize advanced observatory data to track a massive trans-Neptunian object's orbital trajectory. - **Source:** [Wired](https://www.wired.com) - **Published:** 2026-10-29 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/4a3e7c48-aa1a-4900-889c-806c192ad42d ## Discovery of 2026 ED138 Astronomers at the Vera C. Rubin Observatory in Chile have identified a potential new dwarf planet, provisionally named 2026 ED138. Located approximately 46 astronomical units from the sun, this object is currently classified as a trans-Neptunian body. Researchers believe it ranks among the largest and brightest objects discovered within this specific outer region. ## Data Reconstruction Process Researcher Matthew Holman identified the object on October 13, 2026, while processing extensive data sets from the Rubin Observatory. By cross-referencing these findings with archived records dating back to 2016, the team successfully reconstructed over a decade of the object's trajectory. This historical data was essential for confirming the object's consistent orbital path. ## Overcoming Observational Challenges The object remained hidden for years because its position aligns with the dense disk of the Milky Way. The concentrated brightness of millions of stars in that region typically obscures fainter celestial bodies. However, the massive volume of high-resolution data provided by the Rubin Observatory allowed scientists to isolate the object's unique light signature. ## Defining Dwarf Planet Criteria To be officially classified as a dwarf planet, an object must orbit the sun and possess sufficient gravity to maintain a nearly spherical shape. Unlike major planets, these bodies have not cleared their orbital paths of other debris. This distinction led to Pluto's reclassification from a planet to a dwarf planet in 2006. ## Size and Physical Constraints Current estimates place 2026 ED138 between 600 and 1,500 kilometers in diameter. Astronomers must now conduct more precise measurements to determine if its mass creates enough gravitational force to achieve a spherical shape. If these requirements are met, it will join the five currently recognized dwarf planets, including Ceres, Eris, and Makemake. ## Expanding Solar System Catalog Dozens of other candidates, such as Gonggong, Quaoar, Sedna, and Orcus, are currently awaiting formal classification. Experts suggest that the list of potential dwarf planets in the outer solar system is likely much longer than currently documented. Confirming these objects remains a significant challenge due to their extreme distance from the sun. ## Limitations of Remote Observation Directly measuring the mass and size of distant objects is difficult without close-range exploration. For instance, the New Horizons probe required nine and a half years to reach Pluto for high-resolution imaging. Without such dedicated missions, astronomers rely on indirect data analysis, which complicates the verification process for newly discovered trans-Neptunian bodies. ## Broader Structural Context The solar system extends far beyond the eight known planets, encompassing the Kuiper Belt, the scattered disk, and the distant Oort Cloud. These regions contain vast numbers of comets, asteroids, and dwarf planets. Understanding these populations is vital for mapping the true scale and composition of our solar system's extensive, populous outer reaches. ## Sources covering this story - https://www.wired.com/story/astronomers-discover-a-possible-new-dwarf-planet-in-our-solar-system/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._