Possible new dwarf planet found in our solar system

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2025 May 21 - 2017 OF201 appears to be in a very eccentric orbit (0.948), and with an H magnitude of 3.55. Size unknown for the moment but not very big at first sight.

MPEC 2025-K47 : 2017 OF201

We are the official body that deals with astrometric observations and orbits of minor planets (asteroids) and comets.

www.minorplanetcenter.net

Orbit:

https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2017%20OF201&view=VOP

Preprint:

We report the discovery of a dwarf planet candidate, 2017 OF201, currently located at a distance of 90.5 au. Its orbit is extremely wide and extends to the inner Oort cloud, with a semi-major axis of 838 au and a perihelion of 44.9 au precisely determined from 19 observations over seven years. Assuming a typical albedo of 0.15, we estimate a diameter about 700 km, making it the second-largest known object in this dynamical population and a likely dwarf planet. Its high eccentricity suggests that it is part of a broader, unseen population of similar objects totaling about 1 % of Earth's mass. Notably, the orbit of 2017 OF201 lies well outside the clustering of longitude of perihelion observed in extreme trans-Neptunian objects, which has been proposed as dynamical evidence for a distant, undetected planet.

Discovery of a dwarf planet candidate in an extremely wide orbit: 2017 OF201

Periapsis, au: 45.241
Apoapsis, au: 1714.759
Period, years: 26106.07