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The orbit and density of the Jupiter Trojan satellite system Eurybates-Queta

Brown, Michael E. and Levison, Harold F. and Noll, Keith S. and Binzel, Richard and Buie, Marc W. and Grundy, Will and Marchi, Simone and Olkin, Catherine B. and Spencer, John and Statler, Thomas S. and Weaver, Harold (2021) The orbit and density of the Jupiter Trojan satellite system Eurybates-Queta. . (Unpublished)

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We report observations of the Jupiter Trojan asteroid (3548) Eurybates and its satellite Queta with the Hubble Space Telescope and use these observations to perform an orbital fit to the system. Queta orbits Eurybates with a semimajor axis of 2350 ± 11 km at a period of 82.46 ± 0.06 days and an eccentricity of 0.125±0.009. From this orbit we derive a mass of Eurybates of 1.51 ± 0.03 × 10¹⁷ kg, corresponding to an estimated density of 1.1 ± 0.3 g cm⁻³, broadly consistent with densities measured for other Trojans, C-type asteroids in the outer main asteroid belt, and small icy objects from the Kuiper belt. Eurybates is the parent body of the only major collisional family among the Jupiter Trojans; its low density suggests that it is a typical member of the Trojan population. Detailed study of this system in 2027 with the Lucy spacecraft flyby should allow significant insight into collisional processes among what appear to be the icy bodies of the Trojan belt.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Brown, Michael E.0000-0002-8255-0545
Levison, Harold F.0000-0001-5847-8099
Noll, Keith S.0000-0002-6013-9384
Buie, Marc W.0000-0003-0854-745X
Grundy, Will0000-0002-8296-6540
Marchi, Simone0000-0003-2548-3291
Olkin, Catherine B.0000-0002-5846-716X
Spencer, John0000-0003-4452-8109
Statler, Thomas S.0000-0003-4909-9542
Weaver, Harold0000-0003-0951-7762
Additional Information:Attribution 4.0 International (CC BY 4.0). This research is based on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by AURA under NASA contract NAS 5-26555. These observations are associated with programs GO-15144 and GO-16056. Software: MPFIT (Markwardt 2009); emcee (Foreman-Mackey et al. 2013)
Group:Division of Geological and Planetary Sciences
Funding AgencyGrant Number
NASANAS 5-26555
Record Number:CaltechAUTHORS:20211217-233234510
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112544
Deposited By: George Porter
Deposited On:20 Dec 2021 16:31
Last Modified:02 Jun 2023 01:17

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