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dc.contributor.authorSanchez, Juan A.
dc.contributor.authorReddy, Vishnu
dc.contributor.authorThirouin, Audrey
dc.contributor.authorWright, Edward L.
dc.contributor.authorLinder, Tyler R.
dc.contributor.authorKareta, Theodore
dc.contributor.authorSharkey, Benjamin
dc.date.accessioned2019-09-11T00:25:11Z
dc.date.available2019-09-11T00:25:11Z
dc.date.issued2019-08-05
dc.identifier.citationJuan A. Sanchez et al 2019 ApJL 881 L6en_US
dc.identifier.issn2041-8205
dc.identifier.doi10.3847/2041-8213/ab31ac
dc.identifier.urihttp://hdl.handle.net/10150/634151
dc.description.abstractMain belt asteroid (6478) Gault has been dynamically linked with two overlapping asteroid families: Phocaea, dominated by S-type asteroids, and Tamara, dominated by low-albedo C-types. This object has recently become an interesting case for study after images obtained in late 2018 revealed that it was active and displaying a comet-like tail. Previous authors have proposed that the most likely scenarios to explain the observed activity on Gault were rotational excitation or merger of near-contact binaries. Here we use new photometric and spectroscopic data of Gault to determine its physical and compositional properties. Lightcurves derived from the photometric data showed little variation over three nights of observations, which prevented us from determining the rotation period of the asteroid. Using WISE observations of Gault and the near-Earth Asteroid Thermal Model (NEATM) we determined that this asteroid has a diameter <6 km. Near-infrared spectroscopic data obtained with the Infrared Telescope Facility showed a spectrum similar to that of S-complex asteroids, and a surface composition consistent with H chondrite meteorites. These results favor a compositional affinity between Gault and asteroid (25) Phocaea, and rules out a compositional link with the Tamara family. From the spectroscopic data we found no evidence of fresh material that could have been exposed during the outburst episodes.en_US
dc.description.sponsorshipNASA Near-Earth Object Observations Grant [NNX17AJ19G]; Lowell Observatory funds; National Science Foundation [0506716]; NASA [NAG5-12355]en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjecttechniques: spectroscopicen_US
dc.subjectminor planets, asteroids: generalen_US
dc.titlePhysical Characterization of Active Asteroid (6478) Gaulten_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben_US
dc.identifier.journalASTROPHYSICAL JOURNAL LETTERSen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume881
dc.source.issue1
dc.source.beginpageL6
refterms.dateFOA2019-09-11T00:25:12Z


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