Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.3718c&link_type=abstract
American Astronomical Society, DPS meeting #36, #37.18; Bulletin of the American Astronomical Society, Vol. 36, p.1159
Astronomy and Astrophysics
Astronomy
Scientific paper
We present two-dimensional maps of HDO column densities for opposite seasons of the year. The data were collected on March 23, 2003 (Ls ˜ 155 degrees) and January 11, 2004 (Ls ˜ 333 degrees). We used CSHELL at the NASA Infrared Telescope Facility (0.5 arc-second slit, resolving power ˜ 40,000). The slit was positioned N-S on Mars and stepped E-W at one arc-second intervals across the planet. HDO spectral lines were detected near 3.67 μ m; a solar Fraunhofer line near 3.68 μ m was used to monitor the relative proportion between reflected sunlight and surface thermal emission. Values obtained at different slit positions were interpolated and projected onto a globe. Observations from 2003 were centered near 270 W; the map shows the Hellas basin clearly detected. The 2004 observations were centered near 190 W. These observations are part of a larger project to determine the D/H ratio by measuring abundances of HDO and H2O across the planet.
This work was partially funded by grants from NASA's Planetary Astronomy Program (RTOP 344-32-51-96 to M. J. Mumma) and NSF RUI Program (AST-0205397 to R. E. Novak).
Bonev Boncho
Cabral Y. M.
Dunne Thomas
Farrell Aaron
Mumma Michael J.
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