English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the discovery of the minor planet 2013 SY$_{99}$, on anexceptionally distant, highly eccentric orbit. With a perihelion of 50.0 au,2013 SY$_{99}$'s orbit has a semi-major axis of $730 \pm 40$ au, the largestknown for a high-perihelion trans-Neptunian object (TNO), well beyond those of(90377) Sedna and 2012 VP$_{113}$. Yet, with an aphelion of $1420 \pm 90$ au,2013 SY$_{99}$'s orbit is interior to the region influenced by Galactic tides.Such TNOs are not thought to be produced in the current known planetaryarchitecture of the Solar System, and they have informed the recent debate onthe existence of a distant giant planet. Photometry from theCanada-France-Hawaii Telescope, Gemini North and Subaru indicate 2013 SY$_{99}$is $\sim 250$ km in diameter and moderately red in colour, similar to otherdynamically excited TNOs. Our dynamical simulations show that Neptune's weakinfluence during 2013 SY$_{99}$'s perihelia encounters drives diffusion in itssemi-major axis of hundreds of astronomical units over 4 Gyr. The overallsymmetry of random walks in semi-major axis allow diffusion to populate 2013SY$_{99}$'s orbital parameter space from the 1000-2000 au inner fringe of theOort cloud. Diffusion affects other known TNOs on orbits with perihelia of 45to 49 au and semi-major axes beyond 250 au, providing a formation mechanismthat implies an extended population, gently cycling into and returning from theinner fringe of the Oort cloud.

OSSOS: V. Diffusion in the orbit of a high-perihelion distant Solar System object