Virtis aboard the Venus Express mission

Details Virtis aboard the Venus Express mission Virtis aboard the Venus Express mission

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....8807p&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #8807

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Scientific paper

The VIRTIS experiment is one of the instrument core payload for the ESA mission called Venus Express. In respect to the ESA political strategy of cost reduction, the Venus Express mission will be the reuse of the Mars Express bus and in this context the VIRTIS spare from the ESA ROSETTA mission will be indeed adapted to Venus Express. VIRTIS consists of two channels: VIRTIS-M, an imaging spectrometer with moderate spectral resolution and VIRTIS-H, an high spectral resolution spectrometer having its field of view within the field of view of M. The output from VIRTIS-M can be considered to be a large set of stacked monochromatic two-dimensional images at moderate spectral resolution while the field of view of VIRTIS-H centered in the middle of the M frame provides spectra at high spectral resolution in this small portion of the target. The spectral range of VIRTIS-M is within 0.25um and 5um split in two focal planes with a boundary at 1um and a resolution of about 2nm and 10 nm respectively. The spectral range of VIRTIS-H is from 2 to 5um with a resolution of about 2nm. The noise equivalent spectral radiance is about 0.5erg s-1 cm-2 sr-1 um-1 for a 1sec integration time for both -M and H. The main scientific objectives of VIRTIS for Venus are devoted to the atmosphere while surface science is possible in the atmospheric windows. This mission would give us a great opportunity for an extensive observation of Venus after the first attempts of imaging spectrometry performed by NIMS/Galileo and VIMS/Cassini whose flybys gave us the idea of the powerful of this type of investigation. Observation strategy of VIRTIS at Venus is a topic of another paper (see P. Drossart) while objective of the present one is rather to review here the VIRTIS as instrument.

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