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Shape Models of Lucy Targets (3548) Eurybates and (21900) Orus from Disk-integrated Photometry

Mottola, Stefano and Hellmich, Stephan and Buie, Marc W. and Zangari, Amanda M. and Stephens, Robert D. and Di Martino, Mario and Proffe, Gerrit and Marchi, Simone and Olkin, Catherine B. and Levison, Harold F. (2023) Shape Models of Lucy Targets (3548) Eurybates and (21900) Orus from Disk-integrated Photometry. The Planetary Science Journal, 4 (1), p. 18. Institute of Physics (IOP) Publishing. doi: 10.3847/PSJ/acaf79. ISSN 2632-3338.

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Official URL: https://iopscience.iop.org/article/10.3847/PSJ/acaf79


We use our new light curves, along with historical data, to determine the rotation state, photometric properties, and convex shape models of the targets of the Lucy mission (3548) Eurybates and (21900) Orus. We determine a retrograde spin for both targets, with sidereal rotation periods of 8.7027283 ± 0.0000029 h and 13.486190 ± 0.000017 h, respectively. The phase curves of both objects are nearly linear in the phase-angle range observable from Earth and lack a pronounced opposition effect. Unsupervised classification of these phase curves by the Penttilä et al. tool suggests that Eurybates and Orus belong to the C and D taxonomic types, respectively, thereby independently confirming past classifications based on their spectral slope. Time-resolved color-index measurements show no systematic color variations correlated with rotation for either target at the 1% level, suggesting that no variegation is present on a hemispherical scale for any of the objects. Comparison of the shape models with stellar occultation data available for the two objects from the program by Buie et al. allows us to resolve the longitude ambiguity of the orientations of the spin axes and derive unique pole solutions for both targets. Furthermore, scaling the shape models to match the occultation chords produces accurate sizes and geometric albedos for both objects. The derived surface-equivalent spherical diameters are Ds = 69.3 ± 1.4 km and Ds = 60.5 ± 0.9 km for Eurybates and Orus, respectively, while the geometric albedo in the H, G1, G2 system is pV(H, G1, G2) = 0.044 ± 0.003 and pV(H, G1, G2) = 0.040 ± 0.002 for Eurybates and Orus, respectively.

Item URL in elib:https://elib.dlr.de/194154/
Document Type:Article
Title:Shape Models of Lucy Targets (3548) Eurybates and (21900) Orus from Disk-integrated Photometry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mottola, StefanoUNSPECIFIEDhttps://orcid.org/0000-0002-0457-3872UNSPECIFIED
Hellmich, StephanLaboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Switzerlandhttps://orcid.org/0000-0003-3997-3363UNSPECIFIED
Buie, Marc W.Southwest Research Institute, Boulder, COhttps://orcid.org/0000-0003-0854-745XUNSPECIFIED
Zangari, Amanda M.Southwest Research Institute, Boulder, CO, USAhttps://orcid.org/0000-0001-8678-9353UNSPECIFIED
Stephens, Robert D.Center for Solar System Studies, 11355 Mount Johnson Ct., Rancho Cucamonga, CA 91737, USAhttps://orcid.org/0000-0002-0331-7404UNSPECIFIED
Di Martino, MarioINAF, Osservatorio Astronomico di Torinohttps://orcid.org/0000-0003-1265-1540UNSPECIFIED
Marchi, SimoneSouthwest Research Institute, Boulder, CO, USAhttps://orcid.org/0000-0003-2548-3291UNSPECIFIED
Olkin, Catherine B.Southwest Research Institute, Boulder, CO, USAhttps://orcid.org/0000-0002-5846-716XUNSPECIFIED
Levison, Harold F.Southwest Research Institute, Boulder, CO, USAhttps://orcid.org/0000-0001-5847-8099UNSPECIFIED
Date:January 2023
Journal or Publication Title:The Planetary Science Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:p. 18
Publisher:Institute of Physics (IOP) Publishing
Keywords:Jupiter trojans; Light curves; CCD photometry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - LUCY
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:06 Mar 2023 11:25
Last Modified:06 Mar 2023 11:25

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