Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...72...62h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 72, Oct. 1987, p. 62-68.
Physics
22
Absorption Spectra, Methane, Neptune Atmosphere, Planetary Rotation, Clouds (Meteorology), Diurnal Variations, Reflectance, Zonal Flow (Meteorology), Neptune, Atmosphere, Rotation, Period, Earth-Based Observations, Telescope Methods, Clouds, Features, Motion, Reflectivity, Features, Analysis, Data, Images, Wavelengths
Scientific paper
Direct imaging of Neptune through an 8900-Å methane-band filter with the University of Hawaii 2.24-m telescope at Mauna Kea Observatory shows discrete atmospheric cloud features. A rotation period of 17.86±0.02 hr is derived from the observations of two transits of a bright feature in the southern hemisphere during May and June 1986. This period is consistent with earlier observations of cloud motion on Neptune. The imaging also shows that bright features in Neptune's northern hemisphere seen as recently as in 1983 by earlier investigations have disappeared, markedly changing the overall distribution of reflected light from the planetary disk.
Buie Marc William
Hammel Heidi Beth
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