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Lightcurves of Lucy Targets: Leucus and Polymele

Buie, M.W. and Zangari, A.M. and Marchi, S. and Levison, H.F. and Mottola, Stefano (2018) Lightcurves of Lucy Targets: Leucus and Polymele. Astronomical Journal, 155 (6), p. 245. American Astronomical Society. DOI: 10.3847/1538-3881/aabd81 ISSN 0004-6256

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Abstract

We present new observations from 2016 of two Jupiter Trojan asteroids that are targets for the Lucy Discovery mission. The extremely long rotation period of (11351) Leucus is confirmed and refined to a secure value of 445.732 ± 0.021 hr with photometric parameters of H r = 11.046 ± 0.003 and G r = 0.58 ± 0.02 in the SDSS r' filter. This leads to a geometric albedo of p V = 4.7%. The amplitude of the light curve was measured to be 0.61 mag, unchanged from the value of one-fourth of a revolution earlier, suggesting a low obliquity. The first light-curve observations for (15094) Polymele are also presented. This object is revealed to have a much shorter rotation period of 5.8607 ± 0.0005 hr with a very low amplitude of 0.09 mag. Its photometric parameters are H r = 11.691 ± 0.002 and G r = 0.22 ± 0.02. These values lead to a refined geometric albedo of p V = 7.3%. This object is either nearly spherical or was being viewed nearly pole-on in 2016. Further observations are required to fully determine the spin pole orientation and convex-hull shapes.

Item URL in elib:https://elib.dlr.de/112578/
Document Type:Article
Title:Lightcurves of Lucy Targets: Leucus and Polymele
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Buie, M.W.Southwest Research Institute, Boulder, COUNSPECIFIED
Zangari, A.M.Southwest Research Institute, Boulder, COUNSPECIFIED
Marchi, S.SwRI, Boulder CO, USAUNSPECIFIED
Levison, H.F.Southwest Research Institute, Boulder, COUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Date:26 March 2018
Journal or Publication Title:Astronomical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:155
DOI :10.3847/1538-3881/aabd81
Page Range:p. 245
Publisher:American Astronomical Society
ISSN:0004-6256
Status:Published
Keywords:Lightcurves; Lucy; Leucus; Polymele; Jupiter Trojans asteroids: Rotation period; photometric Parameters; first lightcurves observation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Schubert, Renate
Deposited On:22 May 2018 12:47
Last Modified:31 Jul 2019 20:09

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