News and commentary about the Great Frontiers

ISS007-E-10807 (21 July 2003) --- This view of Earth's horizon as the sunsets over the Pacific Ocean was taken by an Expedition 7 crewmember onboard the International Space Station (ISS). Anvil tops of thunderclouds are also visible. Credit: Earth Science and Remote Sensing Unit, NASA Johnson Space Center

Image Credit: ISS007-E-10807 (21 July 2003) – Earth Science and Remote Sensing Unit, NASA Johnson Space Center

Venus Express Checkout Completed with Successful VIRTIS, VMS Images



After a planetary spacecraft is successfully launched on its long journey to its target planetary object, the various teams involved in the mission must checkout the instruments and subsystems they provided. This usually involves taking images to verify that everything is working properly. The Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) and the Venus Monitoring Camera (VMS) on board The European Space Agency’s (ESA) Venus Express successfully captured images of the Earth-Moon system and demonstrated their ability to help explore the mysteries of Venus.

VIRTIS from l’Observatoire de Paris (Paris Observatory) in collaboration with l’IASF-Rome, l’IAS-Orsay and l’DLR-Berlin captures ultraviolet, visible, and near-infrared wavelengths of light. Different wavelengths reveal different characteristics of a planetary body, such as its reflectivity, thermal properties, atmospheric details, etc. The VIRTIS observations of the Earth-Moon system were primarily meant to checkout and calibrate the equipment, but the images may also be used for scientific comparison with future images taken of Venus.

VMS from the Max-Planck-Institut für Sonnensystemforschung (Max Plank Institute for Solar System Research) took the image at the top of the page showing the Moon and Earth in (counterclockwise from the top left) infrared 1, ultraviolet, visible, and infrared 2 light. The Earth is overexposed in these images because the Moon is so much smaller and fainter and therefore its image is harder to capture.

To the left is the Earth captured by VIRTIS in visible light and to the right is the Earth in infrared, revealing its thermal radiance. Antarctica is the brightest red (indicating the weakest radiance) spotch at the bottom of the globe.

Images of VIRTIS (examples below) during laboratory calibration while still located on the Earth are located on the VIRTIS team site.

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