Journal article Open Access

High-Resolution Infrared Imaging of Neptune from the Keck Telescope

Gibbard, S.


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        <foaf:name>Gibbard, S.</foaf:name>
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    <dct:title>High-Resolution Infrared Imaging of Neptune from the Keck Telescope</dct:title>
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    <dct:description>We present results of infrared observations of Neptune from the 10-m W. M. Keck I Telescope, using both high-resolution (0.04 arcsecond) broadband speckle imaging and conventional imaging with narrowband filters (0.6 arcsec resolution). The speckle data enable us to track the size and shape of infrared-bright features ("storms") as they move across the disk and to determine rotation periods for latitudes −30 and −45°. The narrowband data are input to a model that allows us to make estimates of Neptune's stratospheric haze abundance and the size of storm features. We find a haze column density of ∼106 cm−2 for a haze layer located in the stratosphere, and a lower limit of 107 cm−2 and an upper limit of 109 cm−2 for a layer of 0.2 μm particles in the troposphere. We also calculate a lower limit of 7×106 km2 for the size of a "storm" feature observed on 13 October 1997.</dct:description>
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