@article{6241d18cd6454b038acb296565dd0cd5,
title = "Ultraviolet Spectroscopy of Lucy Mission Targets with the Hubble Space Telescope",
abstract = "The recently launched Lucy mission aims to understand the dynamical history of the solar system by examining the Jupiter Trojans, a population of primitive asteroids co-orbital with Jupiter. Using the G280 grism on the Hubble Space Telescope{\textquoteright}s Wide Field Camera 3, we obtained near-ultraviolet spectra of four of the five Lucy mission targets—(617) Patroclus–Menoetius, (11351) Leucus, (3548) Eurybates, and (21900) Orus—to search for novel spectral features. We observe a local reflectance minimum at 0.4 μm accompanied by an increase in reflectance from 0.35 to 0.3 μm in the spectra of Patroclus and Orus. We use the principles of Rayleigh scattering and geometric optics to develop a Hapke optical model to investigate whether this feature can be explained by the presence of submicroscopic grains on Trojan surfaces. The near-ultraviolet “bump” feature can be explained by scattering due to fine-grained opaques (iron, amorphous carbon, or graphite) with grain sizes ranging from 20 to 80 nm.",
author = "Humes, {Oriel A.} and Thomas, {Cristina A.} and Emery, {Joshua P.} and Grundy, {Will M.}",
note = "Funding Information: These observations are associated with program Nos. 15259 and 15504. Support for program Nos. 15259 and 15504 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Funding Information: These results made use of the LDT at Lowell Observatory. Lowell is a private, nonprofit institution dedicated to astrophysical research and public appreciation of astronomy and operates the LDT in partnership with Boston University, the University of Maryland, the University of Toledo, Northern Arizona University, and Yale University. The upgrade of the DeVeny optical spectrograph has been funded by a generous grant from John and Ginger Giovale and a grant from the Mt. Cuba Astronomical Foundation. Funding Information: The authors wish to acknowledge Keith Noll for his assistance in preparing the HST proposal. We would also like to thank the two anonymous peer reviewers whose comments improved the quality and clarity of the manuscript. These observations are associated with program Nos. 15259 and 15504. Support for program Nos. 15259 and 15504 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. These results made use of the LDT at Lowell Observatory. Lowell is a private, nonprofit institution dedicated to astrophysical research and public appreciation of astronomy and operates the LDT in partnership with Boston University, the University of Maryland, the University of Toledo, Northern Arizona University, and Yale University. The upgrade of the DeVeny optical spectrograph has been funded by a generous grant from John and Ginger Giovale and a grant from the Mt. Cuba Astronomical Foundation. Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",
year = "2022",
month = aug,
day = "1",
doi = "10.3847/PSJ/ac8059",
language = "English (US)",
volume = "3",
journal = "Planetary Science Journal",
issn = "2632-3338",
publisher = "IOP Publishing Ltd.",
number = "8",
}