Spectrophotometry of the jovian planets and Titan at 300- to 1000-nm wavelength: The methane spectrum

Details Spectrophotometry of the jovian planets and Titan at 300- to 1000-nm wavelength: The methane spectrum Spectrophotometry of the jovian planets and Titan at 300- to 1000-nm wavelength: The methane spectrum

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..111..174k&link_type=abstract

Icarus (ISSN 0019-1035), vol. 111, no. 1, p. 174-192

Physics

159

Albedo, Jupiter (Planet), Methane, Neptune (Planet), Planetary Atmospheres, Saturn (Planet), Spectrophotometry, Titan, Uranus (Planet), Visible Spectrum, Raman Spectra, Signal To Noise Ratios, Spectroscopic Analysis, Telluric Lines, Water

Scientific paper

Full-disk albedo spectra of the jovian planets and Titan were derived from observations at the European Southern Observatory in July 1993. The spectra extend from 300- to 1000-nm wavelength at 1-nm resolution. The signal-to-noise ratio is approximately 1000 in the visible. The accuracy is 2% for relative and 4% for absolute albedos. Colors and magnitudes were also determined. Some 40-60 Raman scattering features are visible in the spectrum of each jovian planet. A Raman scattering model with five parameters adjusted for each planet can explain these features. A methane absorption spectrum is given which fits methane features in the spectra of the jovian planets and Titan. It differs from room-temeprature laboratory spectra but it is consistent with some limited laboratory data at cold temperatures. Three new, weak methane bands were detected in the spectra of Uranus and Neptune. A strong absorption band in Jupiter's spectrum is possible due to water, confirming a strong depletion of oxygen in the probed part of Jupiter's atmosphere.

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