# Rubin Telescope Finds Possible Dwarf Planet Beyond Pluto — What 2026 ED138 Could Reveal

- Link: https://tectonicsmediapublications.com/rubin-2026-ed138-dwarf-planet-candidate-beyond-pluto-october-29-2026/
- Published: 2026-10-29T04:03:00+00:00
- Author: News Team

**October 29, 2026.** A distant, icy body beyond Pluto is emerging as one of the
solar system’s most intriguing newly identified objects. The [NSF–DOE Vera C. Rubin Observatory announced on October 27](https://rubinobservatory.org/news/rubin-first-dwarf-planet-candidate)
that observations have revealed **2026 ED138**, a large trans-Neptunian object that
_may_ qualify as a dwarf planet. Its status has not yet been confirmed.

## How big is the candidate?

Researchers estimate that ED138 is **600–1,500 kilometers (370–930 miles) across**.
That is a broad estimate, not a direct diameter measurement: the object’s brightness
and distance are known more confidently than the reflectivity of its surface. A 
darker body would have to be larger to produce the same observed brightness, while
a more reflective body could be smaller.

According to the [US National Science Foundation](https://www.nsf.gov/news/new-dwarf-planet-candidate-discovered-nsf-doe-rubin)
and [Stanford’s account of the discovery](https://news.stanford.edu/stories/2026/10/rubin-observatory-dwarf-planet-candidate),
ED138 is currently roughly **46 astronomical units from the Sun** — about 46 times
the Earth–Sun distance. Its orbit is inclined by nearly 25 degrees relative to the
solar system’s main plane, a clue to the gravitational history of distant icy objects.

## Why astronomers missed it

ED138 sits against a crowded part of the Milky Way sky, where distinguishing a faint
moving object from numerous background stars is difficult. Rubin’s repeated observations
and automated searches made that distinction possible. Matthew Holman identified
the candidate while analyzing data on October 13; researchers subsequently found
earlier images, including archival observations from 2016, to help constrain its
orbit.

That process is important in its own right. Repeated wide-field surveys can turn
a faint, easily overlooked dot into an object with a trackable orbit, while archived
images can extend its observation history by years. It is an early demonstration
of how Rubin’s long-term survey could expand the census of the outer solar system.

## What remains unproven

A dwarf planet must be sufficiently massive for its gravity to produce a nearly 
rounded shape. ED138 is large enough to be a plausible candidate, but scientists
still need further observations — including at infrared wavelengths — to refine 
its diameter and physical properties. **It would be inaccurate to call ED138 the
solar system’s confirmed sixth dwarf planet today.** The five currently recognized
by the International Astronomical Union are Ceres, Pluto, Haumea, Makemake and Eris.

## See the observatory’s official orbital animation

The following is a **scientific orbital visualization, not actual camera footage
of ED138**. It is linked by the NSF’s October 27 announcement and shows a model 
of the candidate’s orbit.

[Official NSF announcement and its embedded video](https://www.nsf.gov/news/new-dwarf-planet-candidate-discovered-nsf-doe-rubin)
| [Rubin Observatory’s credited orbital animation page](https://rubinobservatory.org/gallery/collections/news-videos/noirlab2626c).
The official animation is credited to NSF–DOE Vera C. Rubin Observatory/NOIRLab/
SLAC/AURA/R. Proctor, with orbital data from the IAU Minor Planet Center and additional
sky-map credits on the source page. Embedded player playback has not been independently
tested.

_Featured image: illustrative Milky Way photograph by Renden Yoder / Unsplash; it
is not a photograph of ED138._

**Primary reporting and verification:** [Rubin Observatory, October 27](https://rubinobservatory.org/news/rubin-first-dwarf-planet-candidate);
[NSF, October 27](https://www.nsf.gov/news/new-dwarf-planet-candidate-discovered-nsf-doe-rubin);
[Reuters, October 28](https://www.reuters.com/science/possible-new-dwarf-planet-identified-orbiting-beyond-pluto-2026-10-28/).

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