High-Resolution Infrared Imaging of Neptune from the Keck Telescope

Details High-Resolution Infrared Imaging of Neptune from the Keck Telescope High-Resolution Infrared Imaging of Neptune from the Keck Telescope

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002icar..156....1g&link_type=abstract

Icarus, Volume 156, Issue 1, pp. 1-15 (2002).

Physics

2

Scientific paper

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. .

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