Continuum and spectroscopic observations of asteroid (21) Lutetia at millimeter and submillimeter wavelengths with the MIRO instrument on the Rosetta spacecraft

S. Gulkis, S. Keihm, L. Kamp, S. Lee, P. Hartogh, J. Crovisier, E. Lellouch, P. Encrenaz, D. Bockelee-Morvan, M. Hofstadter, G. Beaudin, M. Janssen, P. Weissman, P. A. Von Allmen, T. Encrenaz, C. R. Backus, W. H. Ip, P. F. Schloerb, N. Biver, T. SpilkerI. Mann

研究成果: 雜誌貢獻期刊論文同行評審

35 引文 斯高帕斯(Scopus)

摘要

The European Space Agency's Rosetta spacecraft made a close flyby of asteroid (21) Lutetia on July 10, 2010. The spacecraft carries a dual-band radiometer/spectrometer instrument, named MIRO, which operates at 190 GHz (1.6 mm) and 560 GHz (0.5 mm). During the flyby, the MIRO instrument measured the temperature of Lutetia in both the northern and southern hemispheres. At the time of the flyby, the northern hemisphere was seasonally sun-lit and warmer than the southern hemisphere. Subsurface (depths from ∼2 mm to ∼2 cm) temperatures ranged from ∼200 K on the northern hemisphere to ∼60 K on the southern hemisphere. A lunar-like regolith - very low thermal inertia<20 J/(K m 2 s 0.5) in the upper 1-3 cm overlaying a layer of rapidly increasing density and thermal conductivity - is required to explain the observations. A spectroscopic search was made for H 2O, CO, CH 3OH, and NH 3 in Lutetia's exosphere but none of the molecules were detected. An upper limit to the water column density was estimated to be <5×10 11 molecules/cm 2 at the time of the flyby.

原文???core.languages.en_GB???
頁(從 - 到)31-42
頁數12
期刊Planetary and Space Science
66
發行號1
DOIs
出版狀態已出版 - 6月 2012

指紋

深入研究「Continuum and spectroscopic observations of asteroid (21) Lutetia at millimeter and submillimeter wavelengths with the MIRO instrument on the Rosetta spacecraft」主題。共同形成了獨特的指紋。

引用此