Physical Characteristics of Jupiter's Trojan (1437) Diomedes from a Tri-chord Stellar Occultation in 2020 and Dimensionless 3D Model

2024/12/02 by Dutra, H., Assafin, M., Sicardy, B. +15
#Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2412.01568

Abstract

Jupiter Trojans preserve primitive formation characteristics due to their collisionless stable orbits. Determination of their shapes and size-frequency distribution constrains the collisional evolution of their parent population which also originated the Kuiper Belt. We started a program to find precise sizes/shapes for Trojans, combining stellar occultations and DAMIT 3D shape models. We report results for Diomedes, by fitting its dimensionless 3D model to 3 chords of a stellar occultation observed in 2020, using iterative χ² procedures. The pole coordinates, rotation period, volume-equivalent radius and geometric albedo were: λ = 153.73^o ± 2.5^o, β = 12.69^o ± 2.6^o, P = 24.4984 ± 0.0002 h, R_eq = 59.4 ± 0.3 km and p_V = 0.030 ± 0.004. A precise position was obtained too.

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