Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.0105g&link_type=abstract
American Astronomical Society, DPS meeting #40, #1.05; Bulletin of the American Astronomical Society, Vol. 40, p.386
Other
1
Scientific paper
Earth has been photographed as a single pixel - a "pale blue dot” - by Voyager, Cassini, the Mars Exploration Rovers, and other spacecraft, and studied spectroscopically with Galileo during an Earth fly-by. But our planet has not been the subject of sustained spectroscopic and photometric observations as an unresolved, disk-averaged, time-variable single pixel object (at least not by humans). Disk averaged observations of Earth have, however, been modeled extensively as proxy for observations of extrasolar terrestrial planets which will be possible in the future with instruments such as Darwin or Terrestrial Planet Finder. Interplanetary observations of Earth can mimic these planned observations of extrasolar planets. Features that could potentially be observed include the "red edge” of vegetation, seasonal albedo changes, photometric phase effects such as specular reflection from oceans, rotation rate, spectral differences between oceanic and terrestrial hemispheres, and the seasonal and secular variations in CO2 abundance caused by the hemispheric distribution of vegetation and by the industrial activities of "intelligent” organisms. We have begun regular observations of Earth with the Venus Express spacecraft, and will present some preliminary results, and discuss how these observations can provide context for future observations of Earth-like extrasolar planets.
Bertaux J. J.
Grinspoon David H.
Moore Cristopher
Piccioni Giuseppe
Williams Michael D.
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