Surface Properties, Orbital Dynamics, and Thermophysical Modeling of the Primitive Asteroid (269) Justitia

Abstract

The Emirates Mission to the Asteroid Belt (EMA) will study the ultra-red asteroid (269)~Justitia. In this work, we present the first detailed investigation of Justitia's surface dynamics using the newly developed 3-D polyhedral shape model with 574 vertices and 1,144 faces. We analyze its geopotential, surface acceleration, escape speeds, slopes, and equilibrium points, and we also search for planar symmetric periodic orbits using an equivalent ellipsoidal approximation. Our results indicate that the lowest geopotential values occur at the poles, which also correspond to regions of maximum surface acceleration. The global slope distribution suggests preferred zones of material accumulation or migration, offering clues to Justitia's long-term morphological evolution. Most slopes remain below $40^{\circ }$, implying that loose particles may settle stably across large portions of the surface. We identify five equilibrium points consistent with Justitia's estimated density and slow rotational period. Two external points (E${}_2$ and E${}_4$) exhibit linear stability, and all equilibrium locations lie relatively far from the surface due to the body's slow spin. Additionally, we discover 28 new families of planar symmetric periodic orbits, then classify their topologies and determine their linear stability, providing a dynamical framework relevant to future spacecraft operations near Justitia. Finally, thermal modeling reveals how thermal inertia and heliocentric distance shape Justitia's temperature distribution. The south pole receives more insolation than the north pole, reaching minimum temperatures of about 102~K and 87~K, respectively. These combined dynamical and thermal results offer valuable insights for the EMA mission and for understanding slowly rotating small bodies.

31 pages, 48 figures, and 10 tables. Published in The Planetary Science Journal

References in corpus (22)

• OSIRIS-REx: Sample Return from Asteroid (101955) Bennu
• Initial results from the New Horizons exploration of 2014 MU69, a small Kuiper Belt Object
• The New Horizons Pluto Kuiper belt Mission: An Overview with Historical Context
• Asteroid Taxonomy from Cluster Analysis of Spectrometry and Albedo
• A Compound model for the origin of Earth's water
• Eclipsing Binary Trojan Asteroid Patroclus: Thermal Inertia from Spitzer Observations
• Thermophysical modeling of asteroids from WISE thermal infrared data - Significance of the shape model and the pole orientation uncertainties
• The Puzzling Mutual Orbit of the Binary Trojan Asteroid (624) Hektor
• Hayabusa2 Extended Mission: New Voyage to Rendezvous with a Small Asteroid Rotating with a Short Period
• Review: A Coherent and Comprehensive Model of the Evolution of the Outer Solar System
• A Contact Binary Satellite of the Asteroid (152830) Dinkinesh
• Equilibrium Points and Periodic Orbits in the Vicinity of Asteroids with an Application to 216 Kleopatra
• Discovery of two TNO-like bodies in the asteroid belt
• Orbital Mechanics near a Rotating Asteroid
• Asteroid triple system 2001 SN263 : surfaces characteristics and dynamical environment
• Surface Dynamics, Equilibrium Points and Individual Lobes of the Kuiper Belt Object (486958) Arrokoth
• Dynamical Environment and Surface Characteristics of Asteroid (16) Psyche
• The Distribution of Highly Red-sloped Asteroids in the Middle and Outer Main Belt
• Stability and Evolution of Fallen Particles Around the Surface of Asteroid (101955) Bennu
• The fate of particles in the dynamical environment around Kuiper Belt object (486958) Arrokoth
• A pre-flyby view on the origin of asteroid Donaldjohanson, a target of the NASA Lucy mission
• Equilibrium Points and Surface Dynamics About Comet 67P/Churyumov-Gerasimenko