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Surface Albedo and Spectral Variability of Ceres

Li, Jian-Yang and Reddy, V. and Nathues, A. and Le Corre, Lucille and Izawa, M.R.M. and Cloutis, E. and Sykes, Mark V. and Carsenty, Uri and Castillo-Rogez, J. and Hoffmann, Martin and Jaumann, R. and Krohn, Katrin and Mottola, Stefano and Prettyman, T.H. and Schäfer, Michael and Schenk, P. and Schröder, Stefan and Williams, D.A. and Smith, D.E. and Zuber, Maria T. and Konopliv, A.S. and Park, R.S. and Raymond, C.A. and Russell, C.T. (2016) Surface Albedo and Spectral Variability of Ceres. Astrophysical Journal Letters, 817 (2), pp. 1-7. Institute of Physics (IOP) Publishing. DOI: 10.3847/2041-8205/817/2/L22 ISSN 2041-8205

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Official URL: http://iopscience.iop.org/article/10.3847/2041-8205/817/2/L22/meta;jsessionid=1939A54A4AC645B4DA8E7DA956102E04.c6.iopscience.cld.iop.org

Abstract

Previous observations suggested that Ceres has active, but possibly sporadic, water outgassing as well as possibly varying spectral characteristics over a timescale of months. We used all available data of Ceres collected in the past three decades from the ground and the Hubble Space Telescope, as well as the newly acquired images by the Dawn Framing Camera, to search for spectral and albedo variability on Ceres, on both a global scale and in local regions, particularly the bright spots inside the Occator crater, over timescales of a few months to decades. Our analysis has placed an upper limit on the possible temporal albedo variation on Ceres. Sporadic water vapor venting, or any possibly ongoing activity on Ceres, is not significant enough to change the albedo or the area of the bright features in the Occator crater by >15%, or the global albedo by >3% over the various timescales that we searched. Recently reported spectral slope variations can be explained by changing Sun–Ceres–Earth geometry. The active area on Ceres is less than 1 km2, too small to cause global albedo and spectral variations detectable in our data. Impact ejecta due to impacting projectiles of tens of meters in size like those known to cause observable changes to the surface albedo on Asteroid Scheila cannot cause detectable albedo change on Ceres due to its relatively large size and strong gravity. The water vapor activity on Ceres is independent of Ceres’ heliocentric distance, ruling out the possibility of the comet-like sublimation process as a possible mechanism driving the activity.

Item URL in elib:https://elib.dlr.de/106231/
Document Type:Article
Title:Surface Albedo and Spectral Variability of Ceres
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Li, Jian-YangPlanetary Science Institute, Tucson, AZ 85719, USAUNSPECIFIED
Reddy, V.PSI, TucsonUNSPECIFIED
Nathues, A.Max-Planck Institute for Solar System Research, Katlenburg-Lindau, GermanyUNSPECIFIED
Le Corre, LucillePlanetary Science Institute, Tucson, AZ 85719, USAUNSPECIFIED
Izawa, M.R.M.University of Winnipeg, Winnipeg, CanadaUNSPECIFIED
Cloutis, E.University of Winnipeg, Winnipeg, CanadaUNSPECIFIED
Sykes, Mark V.Planetary Science Institute, Tucson, AZ, United States.UNSPECIFIED
Carsenty, UriUri.Carsenty (at) dlr.deUNSPECIFIED
Castillo-Rogez, J.Jet Propulsion Laboratory, California Institute of Technology,UNSPECIFIED
Hoffmann, MartinMax Planck Institute, Katlenburg-Lindau, Germany.UNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Krohn, Katrinkatrin.krohn (at) dlr.dehttps://orcid.org/0000-0001-8518-4985
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Prettyman, T.H.Planetary Science Institute, Tucson, AZ 85719UNSPECIFIED
Schäfer, MichaelMax Planck Institute for Solar System Research, Katlenburg-Lindau, Germany.UNSPECIFIED
Schenk, P.Lunar and Planetary Institute, 3600 Bay Area Blvd, Houston TX 77058, USAUNSPECIFIED
Schröder, StefanStefanus.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
Williams, D.A.Arizona State UniversityUNSPECIFIED
Smith, D.E.GSFCUNSPECIFIED
Zuber, Maria T.Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USAUNSPECIFIED
Konopliv, A.S.Jet Propulsion Laboratory, PasadenaUNSPECIFIED
Park, R.S.et Propulsion Laboratory,California Institute of Technology, Pasadena, CA, USAUNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USAUNSPECIFIED
Russell, C.T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095UNSPECIFIED
Date:2016
Journal or Publication Title:Astrophysical Journal Letters
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:817
DOI :10.3847/2041-8205/817/2/L22
Page Range:pp. 1-7
Publisher:Institute of Physics (IOP) Publishing
ISSN:2041-8205
Status:Published
Keywords:minor planets, asteroids, Ceres, space vehicles, image processing, photometric
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 - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Krohn, Dr.rer.nat Katrin
Deposited On:04 Oct 2016 12:25
Last Modified:08 Mar 2018 19:00

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