Astronomers Discover Large Dwarf Planet Candidate Beyond Pluto
Astronomers announced the discovery of a large potential dwarf planet, 2026 ED138, located beyond Pluto, with confirmation expected in the coming months.
SPOKANE, Oct 30: Astronomers have discovered a potential new dwarf planet, named 2026 ED138, in the outer reaches of the solar system, beyond the orbit of Pluto. If verified, it would be one of the largest dwarf planets known.
The identification occurred at the Vera C. Rubin Observatory, which houses the world’s largest digital camera and began operations in 2025. Matthew Holman, an astrophysicist at the Center for Astrophysics, led the effort to analyze data collected earlier this year. He remarked that his initial reaction was one of “excited disbelief” upon finding ED138 among billions of detections.
Located approximately 46 astronomical units from the Sun, ED138 is classified as a trans-Neptunian object and has a tilted orbit, suggesting past gravitational interactions with Neptune. Estimates indicate that its diameter could range from 600 to 1,500 kilometers (370 to 930 miles).
Holman explained, “We really need to know how physically big it is, and that will take a few months, probably.” The object was detected as part of preparations for a 10-year survey of the southern sky.
Current knowledge about ED138 is limited, although initial observations suggest it may be composed of ice and organic material. The unique position of ED138 in the dense star field of the Milky Way made detection challenging for previous telescopes. It is not visible to the naked eye but could be seen by skilled amateur astronomers.
If confirmed, ED138 would join an exclusive group of dwarf planets recognized by the International Astronomical Union, which currently includes Pluto, Ceres, Haumea, Makemake, and Eris. Confirmation would involve additional infrared observations, likely using the James Webb Space Telescope.
Paul Byrne, a planetary scientist involved in the findings, expressed excitement over the implications of ED138, stating it signals “a new chapter in solar system and planetary science.”
The Rubin Observatory is expected to discover many more objects in the Kuiper Belt, potentially uncovering dozens of dwarf planets in the coming years. As Holman noted, “Rubin is just doing its job really well, inventorying the Solar System to new depths.”
Sources
Bhupendra Singh Chundawat is a seasoned technology journalist with over 22 years of experience in the media industry. He specializes in covering the global technology landscape, with a deep focus on manufacturing trends and the geopolitical impact on tech companies. Currently serving as the Editor at Udaipur Kiran, his insights are shaped by decades of hands-on reporting and editorial leadership in the fast-evolving world of technology.