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Color Variations of 15 Eunomia

Nathues, Andreas und Mottola, Stefano und Kaasalainen, Mikko und Neukum, Gerhard (2005) Color Variations of 15 Eunomia. IAU Symposium 229, Asteroids, Comets, Meteors, 2005-08-07 - 2005-08-12, Buzios, Brasilien.

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Kurzfassung

We present color ratio curves of the S-asteroid 15 Eunomia, which have been extracted from high-precision photometric lightcurves obtained in three different VNIR wavelength bands at the Bochum Telescope, La Silla. The measured color ratio curves and near infrared spectra were used to derive a detailed surface composition model whose shape has been computed by V-lightcurve inversions. According to this analysis, the asteroid shows on one hemisphere a higher concentration of pyroxene, which causes an increased 440/700 nm and a reduced 940/700 nm reflectance ratio as well as a pronounced 2-ìm absorption band. The remaining surface shows a higher concentration of olivine, leading to a reduced 440/700 nm and slightly increased 940/700 nm color ratio. In addition, we found that the maximum of the 440/700 nm color ratio curve coincides with the minimum of the 940/700 nm color ratio curve and vice versa. We demonstrate on the basis of USGS laboratory spectra that this anti-cyclical behavior can be explained by choosing Fe-rich olivine and a pyroxene with moderate Fe content as varying mineral phases. Furthermore, our observations confirm that 15 Eunomia is an irregular elongated and at least partially differentiated body. In addition, partial differentiation is supported by spectral observations of several fragments, which show differences in the olivine to pyroxene abundance ratio (Nathues 2000, ISSN 1434-8454).

Dokumentart:Konferenzbeitrag (Poster)
Titel:Color Variations of 15 Eunomia
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Nathues, AndreasMPI f. Sonnensystemforschung, Katlenburg-Lindau, Germany
Mottola, StefanoNICHT SPEZIFIZIERT
Kaasalainen, MikkoRolf Nevanlinna Institute, Helsinki, Finland
Neukum, GerhardFreie Universität, Berlin, Germany
Datum:7 August 2005
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Asteroids, Asteroid composition, Asteroid surfaces, Spectrophotometry, Spectroscopy
Veranstaltungstitel:IAU Symposium 229, Asteroids, Comets, Meteors
Veranstaltungsort:Buzios, Brasilien
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2005-08-07 - 2005-08-12
Veranstalter :IAU/Observatorio Nacional
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Asteroiden und Kometen (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Dr.phys. Stefano Mottola
Hinterlegt am:11 Apr 2006
Letzte Änderung:27 Apr 2009 04:57

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