Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations

Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations

► Mid-IR spectra from 5.2 to 38μm using the Spitzer/IRS of 28 asteroids. ► Analyzed using STM and a thermophysical model (TPM) if 3D-shape is available. ► Large (Deq>130km) binary asteroids are covered with a thick layer of thermally insulating regolith. ► Smaller (Deq130km) binary asteroids, the...

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Veröffentlicht in:Icarus (New York, N.Y. 1962) N.Y. 1962), 2012-11, Vol.221 (2), p.1130-1161
Hauptverfasser: Marchis, F., Enriquez, J.E., Emery, J.P., Mueller, M., Baek, M., Pollock, J., Assafin, M., Vieira Martins, R., Berthier, J., Vachier, F., Cruikshank, D.P., Lim, L.F., Reichart, D.E., Ivarsen, K.M., Haislip, J.B., LaCluyze, A.P.
Format: Artikel
Sprache:eng
Schlagworte:
Asteroids
Asteroids, Composition
Astronomy
Astrophysics
Binary systems
Earth, ocean, space
Emissivity
Estimates
Exact sciences and technology
Infrared observations
Minerals
Physics
Satellites of asteroids
Solar system
Space telescopes
Spectra
Spectral emissivity
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Beschreibung
Zusammenfassung:► Mid-IR spectra from 5.2 to 38μm using the Spitzer/IRS of 28 asteroids. ► Analyzed using STM and a thermophysical model (TPM) if 3D-shape is available. ► Large (Deq>130km) binary asteroids are covered with a thick layer of thermally insulating regolith. ► Smaller (Deq130km) binary asteroids, the TPM analysis indicates a low thermal inertia (Γ⩽∼100Js−1/2K−1m−2) and their emissivity spectra display strong mineral features, implying that they are covered with a thick layer of thermally insulating regolith. The smaller (surface-equivalent system diameter Deff
ISSN:0019-1035
1090-2643
DOI:10.1016/j.icarus.2012.09.013