Rubin Observatory spots possible dwarf planet beyond Pluto
The object 2026 ED138 is a candidate, not yet a confirmed dwarf planet, and was found in early survey data.
The Vera C. Rubin Observatory says astronomers using its data have identified a possible dwarf planet beyond Pluto. The object, provisionally designated 2026 ED138, still requires further observations and confirmation before its status is settled.
The discovery was announced by the International Astronomical Union’s Minor Planet Center after observations made during preparations for the Rubin Observatory’s wider Legacy Survey of Space and Time. The object is described as large and bright for a body in that distant region of the Solar System.
The observatory says Matthew Holman, a Rubin operations team member and contributor from the Center for Astrophysics, found the object while running data through a search programme. According to its account, the software compared billions of detections of moving objects to identify observations likely to belong to the same body.
Holman said his first reaction was to suspect a software error because objects of this kind are rare. Researchers then searched for additional observations to test whether the apparent object was real and to improve their understanding of its orbit and size.
The observatory’s announcement calls ED138 a dwarf-planet candidate. That wording matters: the available observations do not yet establish all the properties needed for a final classification, and the object’s size is inferred from its brightness and distance.
If confirmed, ED138 could rank among the larger known dwarf planets in the outer Solar System. The discovery also demonstrates the value of automated searches through large astronomical datasets, where software can identify patterns that would be difficult to find manually.
The Rubin Observatory says it plans a much broader survey of the night sky, using cameras and data systems designed to find changing and moving objects, including asteroids and distant bodies, over repeated observations.
There is no evidence that the object poses a threat to Earth. Its significance is scientific: it may add to knowledge of the Solar System’s distant population and test models of how those bodies formed and evolved.
The finding has been announced by the observatory and the Minor Planet Center, but further observations are needed to confirm its status as a dwarf planet.
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The article relies on the observatory’s announcement and preserves its cautious candidate terminology. It does not turn a provisional identification into a confirmed planetary classification.
- confirmed The object is provisionally designated 2026 ED138. — Rubin Observatory announcement. source
- confirmed The discovery was announced by the Minor Planet Center. — Rubin Observatory announcement. source
- confirmed Further observations are needed for confirmation. — The source describes ED138 as a candidate and discusses the search for additional observations. source
Editor's note
The object’s provisional designation and candidate status are clear. Its final classification, exact size and orbit remain subject to further observations.Sources
- NSF–DOE Vera C. Rubin Observatory Reveals Its First Dwarf Planet Candidate — Rubin Observatory
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