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The Venus Express VIRTIS and MESSENGER teams

Helbert, J. and Robinson, M. S. and Müller, N. and Prockter, L. M. and Head, J. W. and Izenberg, N. R. and Solomon, S. C. and Svedhem, H. and Piccioni, G. and Drossart, P. and MESSENGER Team, (2007) The Venus Express VIRTIS and MESSENGER teams. In: Eos Trans. AGU Fall Meet. Suppl., 88 (52), P41B-03. American Geophysical Union (AGU), Fall Meeting 2007, 2007-12-10 - 2007-12-14, San Francisco, California (USA).

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Abstract

Because Venus Express has been in orbit around Venus since April 2006, MESSENGER's flyby of Venus on 5 June 2007 permitted a coordinated campaign of two-spacecraft observations of that planet. Here we report initial results from joint observations of the surface of Aphrodite Terra performed by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on Venus Express and the Mercury Dual Imaging System (MDIS) on MESSENGER. VIRTIS observed the region 13 hours before and 9 hours after the time of MESSENGER's closest approach (when Venus Express was on the opposite side of the planet). This timeline of nearly 24 hours allows the disentangling of variable atmospheric conditions from surface signals. Both instruments were able to observe the surface in the 1.02 μ m atmospheric window. At this wavelength the CO<sub>2</sub> atmosphere allows about 95% of the thermal radiation from the surface to escape. In addition VIRTIS could make observations in the atmospheric windows at 1.10 and 1.18 μ m, which are less transparent. Radiative transfer models were used to invert VIRTIS images at 1.02, 1.10, and 1.18 μ m for the thermal emission of the surface. Local atmospheric transmittance is derived from VIRTIS images at 1.31 μ m. The combined MDIS and VIRTIS data set covers almost the entire extent of southern Aphrodite Terra. Both instruments observed as expected a correlation between topography and thermal radiation, as the surface temperature on Venus is dominantly a function of altitude. There are, however, tentative indications of possible surface emissivity differences between highland material and the adjacent lowlands. Detailed data analysis and interpretation within the framework of the geology of the region are currently underway.

Document Type:Conference or Workshop Item (Speech)
Title:The Venus Express VIRTIS and MESSENGER teams
Authors:
AuthorsInstitution or Email of Authors
Helbert, J.UNSPECIFIED
Robinson, M. S.School of Earth and Space Exploration, Tempe, Arizona, USA
Müller, N.UNSPECIFIED
Prockter, L. M. The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Head, J. W.Department of Geological Sciences, Brown University, Providence, Rhode Island, USA
Izenberg, N. R.Department of Geological Sciences, Brown University, Providence, Rhode Island, USA
Solomon, S. C.Department of Terrestrial Magnetism Carnegie Institution of Washington, Washington, DC, USA
Svedhem, H.ESA, Noordwijk, Netherlands
Piccioni, G.INAF - IASF Roma, Roma, Italy
Drossart, P.LESIA - Observatoire de Paris, Paris, France
MESSENGER Team, UNSPECIFIED
Date:13 December 2007
Journal or Publication Title:Eos Trans. AGU Fall Meet. Suppl.
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:88
Page Range:P41B-03
Status:Published
Keywords:Remote sensing, Surface materials and properties, Volcanism, Venus, VIRTIS, Venus Express, MDIS, MESSENGER
Event Title:American Geophysical Union (AGU), Fall Meeting 2007
Event Location:San Francisco, California (USA)
Event Type:international Conference
Event Dates:2007-12-10 - 2007-12-14
Organizer:American Geophysical Union
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 Venus Express (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Stefanie Hempel
Deposited On:15 Jan 2008
Last Modified:27 Apr 2009 14:35

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