Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5501b&link_type=abstract
American Astronomical Society, DPS meeting #39, #55.01; Bulletin of the American Astronomical Society, Vol. 39, p.525
Astronomy and Astrophysics
Astronomy
Scientific paper
We obtained high resolution optical spectra of Uranus in December 2003, using the 2dcoude spectrograph of the McDonald Observatory 2.7 Harlan Smith Telescope. The spectrograph was configured in the high resolution mode giving a resolving power of 120,000. We obtained spectra of Uranus at the wavelengths of the H2 quadrupole (4-0) S(0) and S(1) lines as well as the CH4 6819 Angstrom feature. The observations were made near Uranus equinox, so on one of the nights we were able to spatially resolve two hemispheres along the spectrograph slit. The motivation behind the observations was to observe changes in the atmospheric structure as the northern hemisphere comes into view and responds to the increasing solar insolation. We present the results of atmospheric radiative transfer modeling to reproduce the observed H2 line profiles. We compare these results with the analyses of similar observations of the northern hemisphere made in 1980, one full Uranus season ago.
Baines Kevin Hays
Bjerke Lance
Cochran William D.
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