Physics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.324..227l&link_type=abstract
Nature (ISSN 0028-0836), vol. 324, Nov. 20, 1986, p. 227-231.
Physics
23
Atmospheric Chemistry, Methane, Neptune Atmosphere, Oblate Spheroids, Planetary Rings, Stellar Occultation, Atmospheric Circulation, Atmospheric Temperature, Hydrogen, Stratosphere
Scientific paper
The occultation of a star by Neptune on 20 August 1985 was observed at 2.2 μm wavelength with telescopes at the European Southern Observatory (ESO) and the Cerro Tololo Inter-American Observatory (CTIO). The detection of a 'central flash' midway between immersion and emersion has allowed the determination of Neptune's oblateness, ɛ, and the atmospheric extinction at 2.2 μm, which is related to the stratospheric methane mixing ratio. The authors find ɛ = (2.08 (+0.19, -0.18))×10-2 and, assuming a stratospheric temperature of 120K, infer a value of 0.6% (with an uncertainty of a factor of 10) for the methane mixing ratio (CH4/H2) at 0.3 mbar. The latter value may indicate supersaturation of methane in Neptune's stratosphere.
Bouchet Patrice
Hubbard William B.
Lellouch Emmanuel
Sicardy Bruno
Vilas Faith
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