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| 題名: | Continuum and spectroscopic observations of asteroid (21) Lutetia at millimeter and submillimeter wavelengths with the MIRO instrument on the Rosetta spacecraft |
| 作者: | 葉永烜;Gulkis, S.;Keihm, S.;Kamp, L.;Lee, S.;Hartogh, P.;Crovisier, J.;Lellouch, E.;Encrenaz, P.;Bockelee-Morvan, D.;Hofstadter, M.;Beaudin, G.;Janssen, M.;Weissman, P.;von Allmen, P.A.;Encrenaz, T.;Backus, C.R.;Ip, W.-H.;Schloerb, P.F.;Biver, N.;Spilker, T.;Mann, I. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Asteroid;Asteroid Lutetia;Asteroids;Astronomy;Astrophysics;Density;Northern Hemisphere;Physics;Rosetta spacecraft;Searching;Southern Hemisphere;Spacecraft;Spectroscopy;Submillimeter and millimeter radiometer/spectrometer;Thermal conductivity;Thermal emission |
| 日期: | 2012-06-01 |
| 上傳時間: | 2026-04-21 14:14:34 (UTC+8) |
| 出版者: | Elsevier Ltd.;Elsevier Ltd |
| 摘要: | 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 190GHz (1.6mm) and 560GHz (0.5mm). 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 ∼2mm to ∼2cm) temperatures ranged from ∼200K on the northern hemisphere to ∼60K on the southern hemisphere. A lunar-like regolith – very low thermal inertia<20J/(Km2s0.5) in the upper 1–3cm overlaying a layer of rapidly increasing density and thermal conductivity – is required to explain the observations. A spectroscopic search was made for H2O, CO, CH3OH, and NH3 in Lutetia's exosphere but none of the molecules were detected. An upper limit to the water column density was estimated to be <5×1011molecules/cm2 at the time of the flyby. ► Lutetia's regolith has a very low thermal inertia, similar to the lunar regolith. ► Microgardening of Lutetia's surface is proposed. ► Upper limit on water vapor in Lutetia's exosphere is reported. ► Near surface temperatures of ∼60K measured at Lutetia's winter pole.
出版者： Elsevier Ltd
出版日期： 2012-06
出處： Planetary and space science, 2012-06, Vol.66 (1), p.31-42
資源來源： Elsevier ScienceDirect Journals Complete **
版權： 2011 Elsevier Ltd
版權： licence_http://creativecommons.org/publicdomain/zero
識別號： ISSN: 0032-0633
識別號： EISSN: 1873-5088
識別號： DOI: 10.1016/j.pss.2011.12.004 |
| 顯示於類別: | [天文研究所] 期刊論文
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