The ISO Spectra of Uranus and Neptune in the 2.5 - 5.0 Micron Range

Details The ISO Spectra of Uranus and Neptune in the 2.5 - 5.0 Micron Range The ISO Spectra of Uranus and Neptune in the 2.5 - 5.0 Micron Range

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456...19e&link_type=abstract

ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP

Physics

1

Iso, Solar System, Uranus, Neptune

Scientific paper

Spectra of Uranus and Neptune were recorded in May 1997, between 2.5 and 4.8 μm, using the ISO PHT-S instrument. The two planets were detected at 2.75 μm, with geometric albedos of 0.0015 and 0.0052 for Uranus and Neptune respectively. In the case of Uranus, the shape of the CH4 absorption is consistent with a reflection over the 3 bar-level; in the case of Neptune, the reflection seems to take place above the CH4 cloud at about 0.3 bar. Two ISO-SWS spectra, recorded on Uranus around 3.3 μm in April and May 1998, show the presence of 4 H3+ emission lines. The inferred H3+ column density is 0.6 - 2.4 1011 cm-2, and the rotational temperature is 800 +/- 100 K.

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