The Astronomical Color of Earth from EPOXI Observations

Details The Astronomical Color of Earth from EPOXI Observations The Astronomical Color of Earth from EPOXI Observations

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.1117h&link_type=abstract

American Astronomical Society, DPS meeting #40, #11.17; Bulletin of the American Astronomical Society, Vol. 40, p.404

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the empirical astronomical color of Earth determined from observations by the High Resolution Imager (HRI) on the Deep Impact flyby spacecraft. These observations are part of NASA's EPOXI (EPOCh+DIXI) Discovery mission, and photometric-quality images of Earth were acquired on Mar 19, May 29, and June 05 2008, from a distance of 0.18, 0.33 and 0.34 AU, respectively (with relative phase angle range 57°-77°). The HRI imager includes six 100nm-wide filters centered at 450, 550, 650, 750, and 850nm, and short- and long-pass filters with nominal centers of 370 and 950nm, respectively. In each of the above time periods, Earth was observed over a 24 hour interval with the 450, 550, 650 and 850nm filters capturing frames every 15 minutes; the full seven filter sequence was obtained with a time resolution of 1 hour. In addition, standard stars were observed with the same filters during instrument calibration. The combined data from Earth imaging and stellar photometry allow us to characterize the color of the earth as an extrasolar terrestrial analog with respect to the standard astronomical photometric bands. We will present the geographical regions that dominate the global color index and the implications for future terrestrial planet search missions.
This work is supported by the NASA Discovery Program.

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