The 1 - 13 μm Spectra of Deimos and Phobos

Details The 1 - 13 μm Spectra of Deimos and Phobos The 1 - 13 μm Spectra of Deimos and Phobos

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.1603l&link_type=abstract

American Astronomical Society Meeting 203, #16.03; Bulletin of the American Astronomical Society, Vol. 35, p.1233

Astronomy and Astrophysics

Astronomy

Scientific paper

We report 3 -13 μm spectroscopy of the moons of Mars. Observations were made using the Broadband Array Spectrograph System (BASS) with a 3.4-arcsec diameter beam on the NASA IRTF on Aug 21.6 2003 UT. The spectra for both objects showed significant departures from a single-temperature gray body function. The 5 -12 μm color temperatures of Deimos and Phobos were 310 +/- 5 K and 345 K +/- 5 K respectively, significantly higher than the black body thermal equilibrium temperature (237 K) at Mars' heliocentric distance. Relative to the color temperature fits, Deimos exhibited significant excess emission between 8 and 10.5 microns and Phobos showed only marginal excess emission. These findings are based on a flux model for the calibrator of alpha Tau that includes the SiO absorption between 7.9 and 10 μm. The M and [N = 10.2 μm] magnitudes for Deimos were 5.3 +/- 0.3 and 0.76 +/- 0.05 respectively. The L, M and [N = 10.2 μm] magnitudes for Phobos were 6.3, 4.2 and 0.05 respectively, all +/- 0.07.

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