Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5207l&link_type=abstract
American Astronomical Society, DPS meeting #42, #52.07; Bulletin of the American Astronomical Society, Vol. 42, p.1071
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of Mars have been obtained by NASA's EPOXI mission to investigate empirically the visible-to-near infrared spectral distribution and lightcurve variations of Mars as a plausible model for terrestrial exoplanets, and to test the ability to distinguish an "exo-Mars” from an "exo-Earth.” The EPOXI mission has previously observed the Earth from within the ecliptic plane and also at high inclination, where the view was dominated by the polar regions. Observations of the whole disc of Mars were acquired from within the ecliptic plane in late November 2009 UT at a sub-spacecraft latitude of 15°N at 37° phase angle (90% illumination) and 1.04 AU range. The visible-light signal was sampled with 7 filters of approximately 100 nm width at 100 nm spacing over a range of 350-950 nm central wavelength. Four selected filters were sampled at 15-minute intervals and the remaining three filters were sampled at 1-hour intervals. Near-IR spectroscopy at 1.05-4.5 µm was obtained at 2-hour intervals. These data will be compared to similar observations of the Earth, to test the ability to identify the presence of life according to currently conceived criteria for global biomarkers.
This work is supported by the NASA Discovery Program.
A'Hearn Michael F.
Charbonneau David
Deming Drake
EPOXI-EPOCh Science Team
Hewagama Tilak
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