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A large fraction of 100-km-class low-inclination objects in the classical Kuiper Belt (KB) are binaries with comparable mass and wide separation of components. A favored model for their formation was capture during the coagulation growth of…

Earth and Planetary Astrophysics · Physics 2015-05-19 David Nesvorny , Andrew N. Youdin , Derek C. Richardson

The recent discovery of binary objects in the Kuiper-belt opens an invaluable window into past and present conditions in the trans-Neptunian part of the Solar System. For example, knowledge of how these objects formed can be used to impose…

Astrophysics · Physics 2009-06-23 Ernestine A. Lee , Sergey A. Astakhov , David Farrelly

Trans-Neptunian objects (TNOs) are icy/rocky bodies that move beyond the orbit of Neptune in a region known as the trans-Neptunian belt (or Edgeworth-Kuiper belt). In contrast to the predictions of accretion models that feature…

Earth and Planetary Astrophysics · Physics 2013-06-17 Patryk Sofia Lykawka

Given the large orbital separation and high satellite-to-primary mass ratio of all known Kuiper Belt Object (KBO) binaries, it is important to reassess their stability as bound pairs with respect to several disruptive mechanisms. Besides…

Astrophysics · Physics 2007-05-23 Jean-Marc Petit , Olivier Mousis

The widely-separated, near-equal mass binaries hosted by the cold Classical Kuiper Belt are delicately bound and subject to disruption by many perturbing processes. We use analytical arguments and numerical simulations to determine their…

Earth and Planetary Astrophysics · Physics 2015-06-03 Alex H. Parker , J. J. Kavelaars

The existence of extremely wide binaries in the low-inclination component of the Kuiper Belt provides a unique handle on the dynamical history of this population. Some popular frameworks of the formation of the Kuiper Belt suggest that…

Earth and Planetary Astrophysics · Physics 2015-05-20 Alex H. Parker , JJ Kavelaars

The orbital element distribution of trans-Neptunian objects (TNOs) with large pericenters has been suggested to be influenced by the presence of an undetected, large planet at >200 AU from the Sun. To find additional observables caused by…

Earth and Planetary Astrophysics · Physics 2017-01-04 S. M. Lawler , C. Shankman , N. Kaib , M. T. Bannister , B. Gladman , J. J. Kavelaars

A critical step toward the emergence of planets in a protoplanetary disk consists in accretion of planetesimals, bodies 1-1000 km in size, from smaller disk constituents. This process is poorly understood partly because we lack good…

Earth and Planetary Astrophysics · Physics 2019-06-28 David Nesvorny , Rixin Li , Andrew N. Youdin , Jacob B. Simon , William M. Grundy

Approximately 10-20% of all Kuiper belt objects (KBOs) occupy mean-motion resonances with Neptune. This dynamical configuration likely resulted from resonance capture as Neptune migrated outward during the late stages of planet formation.…

Earth and Planetary Astrophysics · Physics 2015-05-27 Ruth A. Murray-Clay , Hilke E. Schlichting

We used N-body simulations to model the 4.5 Gyr orbital evolution of the early Kuiper Belt, incorporating a massive protoplanetary disk, the four giant planets, and 1500 primordial Pluto-class bodies ("Plutos") that drove Neptune's grainy…

Earth and Planetary Astrophysics · Physics 2026-02-20 Patryk Sofia Lykawka , Jonathan Horner , Pedro Bernardinelli

Many massive objects have been found in the outer region of the Solar system. How they were formed and evolved has not been well understood, although there have been intensive studies on accretion process of terrestrial planets. One of the…

Earth and Planetary Astrophysics · Physics 2015-06-22 Junko D. Kominami , Junichiro Makino

The size distribution of TNOs in the Kuiper Belt provides crucial insights into the formation and evolution of the outer Solar System. Recent observational surveys, including OSSOS++, have revealed that dynamically cold and hot TNO…

Earth and Planetary Astrophysics · Physics 2025-03-26 Chris W. Ormel , Yukun Huang

Trans-Neptunian objects (TNO) represent the leftovers of the formation of the Solar System. Their physical properties provide constraints to the models of formation and evolution of the various dynamical classes of objects in the outer…

Discovery of transneptunian object (TNO) satellites and determination of their orbits has recently enabled estimation of the size and albedo of several small TNOs, extending the size range of objects having known size and albedo down into…

Astrophysics · Physics 2009-11-10 W. M. Grundy , K. S. Noll , D. C. Stephens

As indicated by their special characteristics, the cold classical Kuiper belt objects (KBOs) formed and survived at 42-47 au. Notably, they show a large fraction of equal-size binaries whose formation is probably related to the accretion of…

Earth and Planetary Astrophysics · Physics 2019-05-29 David Nesvorny , David Vokrouhlicky

With perihelia well beyond Neptune, but semimajor axes and eccentricities indicative of substantial perturbation, the origins of detached trans-Neptunian objects (TNOs) remain a dynamical puzzle. In particular, detached TNOs with orbital…

Earth and Planetary Astrophysics · Physics 2025-07-08 Nathan A. Kaib , Chadwick A. Trujillo , Scott S. Sheppard

A distant, massive planet in the outer solar system has recently been proposed to explain some observed features of extreme trans-Neptunian objects (TNOs). Here we use N-body simulations of the formation of the Kuiper belt and Oort cloud as…

Earth and Planetary Astrophysics · Physics 2021-10-13 Kalee E. Anderson , Nathan A. Kaib

Dynamical mass estimates for the main asteroid belt and the trans-Neptunian Kuiper belt have been found from their gravitational influence on the motion of planets. Discrete rotating models consisting of moving material points have been…

Earth and Planetary Astrophysics · Physics 2018-11-14 E. V. Pitjeva , N. P. Pitjev

We present results for the short-term variability of Binary Trans-Neptunian Objects (BTNOs). We performed CCD photometric observations using the 3.58 m Telescopio Nazionale Galileo, the 1.5 m Sierra Nevada Observatory telescope, and the…

Earth and Planetary Astrophysics · Physics 2014-09-10 A. Thirouin , K. S. Noll , J. L. Ortiz , N. Morales

This chapter reviews accretion models for Kuiper belt objects (KBOs), discussing in particular the compatibility of the observed properties of the KBO population with the streaming instability paradigm. Then it discusses how the dynamical…

Earth and Planetary Astrophysics · Physics 2020-01-22 Alessandro Morbidelli , David Nesvorny