The Geology and Geophysics of Kuiper Belt Object (486958) Arrokoth

Abstract

The Cold Classical Kuiper Belt, a class of small bodies in undisturbed orbits beyond Neptune, are primitive objects preserving information about Solar System formation. The New Horizons spacecraft flew past one of these objects, the 36 km long contact binary (486958) Arrokoth (2014 MU69), in January 2019. Images from the flyby show that Arrokoth has no detectable rings, and no satellites (larger than 180 meters diameter) within a radius of 8000 km, and has a lightly-cratered smooth surface with complex geological features, unlike those on previously visited Solar System bodies. The density of impact craters indicates the surface dates from the formation of the Solar System. The two lobes of the contact binary have closely aligned poles and equators, constraining their accretion mechanism.

References in corpus (30)

• Dynamical Evolution of the Early Solar System
• A ring system detected around the Centaur (10199) Chariklo
• The Canada-France Ecliptic Plane Survey - Full Data Release: The orbital structure of the Kuiper belt
• The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation
• The Absolute Magnitude Distribution of Kuiper Belt Objects
• Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft
• Initial results from the New Horizons exploration of 2014 MU69, a small Kuiper Belt Object
• Ralph: A Visible/Infrared Imager for the New Horizons Pluto/Kuiper Belt Mission
• Long-Range Reconnaissance Imager on New Horizons
• Impact Craters on Pluto and Charon Indicate a Deficit of Small Kuiper Belt Objects
• Possible ring material around centaur (2060) Chiron
• The albedo-color diversity of transneptunian objects
• The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper belt
• Triplicity and Physical Characteristics of Asteroid (216) Kleopatra
• The thermal, mechanical, structural, and dielectric properties of cometary nuclei after Rosetta
• Demographics of Planetesimals Formed by the Streaming Instability
• Color, Composition, and Thermal Environment of Kuiper Belt Object (486958) Arrokoth
• Rotation of Cometary Nuclei: New Lightcurves and an Update of the Ensemble Properties of Jupiter-Family Comets
• The Puzzling Mutual Orbit of the Binary Trojan Asteroid (624) Hektor
• High-Precision Orbit Fitting and Uncertainty Analysis of (486958) 2014 MU69
• The Intrinsic Neptune Trojan Orbit Distribution: Implications for the Primordial Disk and Planet Migration
• A rapid decrease in the rotation rate of comet 41P/Tuttle-Giacobini-Kresák
• The Plutino population: An Abundance of contact binaries
• Trans-Neptunian binaries (2018)
• Crater Density Predictions for New Horizons flyby target 2014 MU69
• Lightcurves and Rotational Properties of the Pristine Cold Classical Kuiper Belt Objects
• The HST Lightcurve of (486958) 2014 MU69
• Great Expectations: Plans and Predictions for New Horizons Encounter with Kuiper Belt Object 2014 MU69 ('Ultima Thule')
• The New Horizons and Hubble Space Telescope Search For Rings, Dust, and Debris in the Pluto-Charon System
• The shape evolution of cometary nuclei via anisotropic mass loss

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• The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper belt
• Color, Composition, and Thermal Environment of Kuiper Belt Object (486958) Arrokoth
• On the Origin and Thermal Stability of Arrokoths and Plutos Ices
• OSSOS XX: The Meaning of Kuiper Belt Colors
• Precise astrometry and diameters of asteroids from occultations -- a data-set of observations and their interpretation
• A re-assessment of the Kuiper belt size distribution for sub-kilometer objects, revealing collisional equilibrium at small sizes
• Stellar occultations enable milliarcsecond astrometry for Trans-Neptunian objects and Centaurs
• Centaur and giant planet crossing populations: origin and distribution
• The hot main Kuiper belt size distribution from OSSOS
• A Statistical Review of Light Curves and the Prevalence of Contact Binaries in the Kuiper Belt
• A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS${}_4$ measured from stellar occultations
• Collision Probabilities in the Edgeworth-Kuiper belt
• An inflationary disk phase to explain extended protoplanetary dust disks
• Origin and Evolution of Jupiter's Trojan Asteroids
• Surface Dynamics, Equilibrium Points and Individual Lobes of the Kuiper Belt Object (486958) Arrokoth
• Sublimation of ices during the early evolution of Kuiper belt objects
• Stellar occultations by Trans-Neptunian Objects
• Photometry of Kuiper Belt Object (486958) Arrokoth from New Horizons LORRI
• Modification of icy planetesimals by early thermal evolution and collisions: Constraints for formation time and initial size of comets and small KBOs
• Determining the dust environment of an unknown comet for a spacecraft fly-by: The case of ESA's Comet Interceptor mission
• Subsurface pulse, crater and ejecta asymmetry from oblique impacts into granular media
• Sublimation as an effective mechanism for flattened lobes of (486958) Arrokoth
• The fate of particles in the dynamical environment around Kuiper Belt object (486958) Arrokoth
• Understanding the trans-Neptunian Solar system: Reconciling the results of serendipitous stellar occultations and the inferences from the cratering record
• The Sizes and Albedos of Centaurs 2014 YY ${}_{49}$ and 2013 NL ${}_{24}$ from Stellar Occultation Measurements by RECON
• Gravitational disturbance on asteroidal ring systems by close encounter with a small object
• The plausibility of origins scenarios requiring two impactors
• Occultation constraints on solar system formation models
• Considering contact forces during the formation of planetesimals by gravitational collapse: mutual orbits, spin states, and shapes
• Dynamical environments of (486958) Arrokoth: prior evolution and present state
• Enlargement of depressions on comet 81P/Wild 2: Constraint based on 30-year cometary activity in the inner Solar System
• Direct contact binary planetesimal formation from gravitational collapse
• A Pluto--Charon Sonata IV. Improved Constraints on the Dynamical Behavior and Masses of the Small Satellites
• OSSOS finds an Exponential Cutoff in the Size Distribution of the Cold Classical Kuiper belt