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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. Planetary Science Journal, 2 (5). Art. No. 170. ISSN 2632-3338. doi:10.3847/psj/ac07b0.

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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:Article
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
Binzel, Richard0000-0002-9995-7341
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:© 2021. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 March 22; revised 2021 May 28; accepted 2021 June 1; published 2021 August 24. 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).
Funding AgencyGrant Number
NASANAS 5-26555
Subject Keywords:Asteroid satellites; Jupiter trojans
Issue or Number:5
Classification Code:Unified Astronomy Thesaurus concepts: Asteroid satellites (2207); Jupiter trojans (874)
Record Number:CaltechAUTHORS:20210914-225400690
Persistent URL:
Official Citation:Michael E. Brown et al 2021 Planet. Sci. J. 2 170
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110893
Deposited By: George Porter
Deposited On:16 Sep 2021 21:24
Last Modified:16 Sep 2021 21:24

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