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

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    Authors
    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.
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    Discipline
    Physical sciences
    Audience
    Scientific
    Date
    2012
    Metadata
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    Description
    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 m2 s0.5) 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 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 <5×1011 molecules/cm2 at the time of the flyby.
    Citation
    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. (2012). Continuum and spectroscopic observations of asteroid (21) Lutetia at millimeter and submillimeter wavelengths with the MIRO instrument on the Rosetta spacecraft. , Planetary and Space Science, Vol. 66, Issue 1, 31-42, DOI: 10.1016/j.pss.2011.12.004.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/3013
    doi: http://dx.doi.org/10.1016/j.pss.2011.12.004
    scopus: 2-s2.0-84861182810
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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