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21 Lutetia and other M-types: Their sizes, albedos, and thermal properties from new IRTF measurements

Mueller, Michael und Harris, Alan W. und Delbo, Marco und MIRSI-team, (2005) 21 Lutetia and other M-types: Their sizes, albedos, and thermal properties from new IRTF measurements. In: Bulletin of the American Astronomical Society, 37, Seite 627. DPS meeting 2005, 2005-09-04 - 2005-09-09, Cambridge (GB).

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Offizielle URL: http://www.aas.org/publications/baas/v37n3/dps2005/486.htm

Kurzfassung

The M-type taxonomic group, introduced by Tholen (1989), contains asteroids with generally featureless spectra and IRAS albedos of around 0.2. M-type asteroids were originally believed to have a metallic surface composition. However, it now seems that other types of surface composition may also give rise to M-type spectra (e.g. Rivkin et al., 2000). One of the Rosetta fly-by targets, M-type asteroid 21 Lutetia, was recently found by several authors to display spectral features indicative of a more primitive surface composition, which is usually associated with a C-type classification and a low albedo incompatible with the IRAS albedo for Lutetia. We report results from new thermal-infrared observations of Lutetia and other M-type asteroids performed at the NASA IRTF. The radiometric sizes and albedos of the targets have been determined and information on thermal properties such as thermal inertia has been derived from the apparent color temperatures of their thermal continua. One might expect metallic surfaces to have higher thermal conductivities and therefore to be associated with higher values of thermal inertia. The diameter and albedo derived for Lutetia are 98.3 +/- 5.9 km and pv = 0.208 +/- 0.025, in excellent agreement with the IRAS values. A C-type albedo (pv up to 0.1) is therefore ruled out but our results are not indicative of an unusually high thermal inertia. We also report on the analysis of observations of the M-type asteroids (129) Antigone and (785) Zwetana, both of which appear to have patches of very high and low radar albedo (M. Shepard, private communication) consistent with (but not restricted to) a metal and non-metal surface composition, respectively.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:21 Lutetia and other M-types: Their sizes, albedos, and thermal properties from new IRTF measurements
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Mueller, MichaelNICHT SPEZIFIZIERT
Harris, Alan W.NICHT SPEZIFIZIERT
Delbo, MarcoINAF - Astronomical Observatory of Turin
MIRSI-team, NICHT SPEZIFIZIERT
Datum:2005
Erschienen in:Bulletin of the American Astronomical Society
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:37
Seitenbereich:Seite 627
Status:veröffentlicht
Stichwörter:asteroids
Veranstaltungstitel:DPS meeting 2005
Veranstaltungsort:Cambridge (GB)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2005-09-04 - 2005-09-09
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: Michael Müller
Hinterlegt am:01 Mär 2006
Letzte Änderung:27 Apr 2009 04:48

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