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Spitzer survey of the Karin Cluster asteroids

Harris, Alan and Mueller, Michael and Lisse, Casey and Cheng, Andy and Osip, David (2007) Spitzer survey of the Karin Cluster asteroids. In: American Astronomical Society, DPS meeting 39, 16.03. American Astronomical Society. American Astronomical Society, DPS meeting 39, 2007-10-7 - 2007-10-12, Orlando, Florida, USA.

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Abstract

The Karin cluster is one of the youngest known families of main-belt asteroids, dating back to a collisional event only 5.8 Myr ago. Using the Spitzer Space Telescope we have sampled the thermal continua of 17 Karin cluster asteroids, down to the smallest members discovered so far, in order to derive accurate sizes and study the physical properties of their surfaces. The albedos of the observed Karins appear to be very similar. The albedos, pv, have a mean of 0.17 and a standard deviation of 0.04, compared to pv = 0.15 ± 0.05 for 832 Karin itself (for H = 11.2 ± 0.3). The derived diameters range from 20 km for 832 Karin to 1.9 km for 93690, with uncertainties of 10%. The Karins data show no evidence of albedo dependence on size, and the small range of albedos is consistent with all program targets being S-type bodies. There is some evidence for higher values of thermal inertia amongst the smaller family members, which may be indicative of coarser regolith. These results are preliminary, pending outstanding Spitzer observations and further analysis. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.

Document Type:Conference or Workshop Item (Speech)
Title:Spitzer survey of the Karin Cluster asteroids
Authors:
AuthorsInstitution or Email of Authors
Harris, AlanUNSPECIFIED
Mueller, MichaelUNSPECIFIED
Lisse, CaseyJohns Hopkins University, USA
Cheng, AndyJohns Hopkins University, USA
Osip, DavidLas Campanas Observatory, Chile
Date:October 2007
Journal or Publication Title:American Astronomical Society, DPS meeting 39, 16.03
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
American Astronomical Society, UNSPECIFIED
Publisher:American Astronomical Society
Status:Published
Keywords:Asteroids, Families, Infrared observations, Spitzer
Event Title:American Astronomical Society, DPS meeting 39
Event Location:Orlando, Florida, USA
Event Type:international Conference
Event Dates:2007-10-7 - 2007-10-12
Organizer:American Astronomical Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Prof. Alan Harris
Deposited On:15 Jan 2008
Last Modified:27 Apr 2009 14:37

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