Journal article Open Access

High-Resolution Infrared Imaging of Neptune from the Keck Telescope

Gibbard, S.


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{
  "DOI": "10.1006/icar.2001.6766", 
  "author": [
    {
      "family": "Gibbard, S."
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2002, 
        3, 
        1
      ]
    ]
  }, 
  "abstract": "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 \u221230 and \u221245\u00b0. 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 \u223c106 cm\u22122 for a haze layer located in the stratosphere, and a lower limit of 107 cm\u22122 and an upper limit of 109 cm\u22122 for a layer of 0.2 \u03bcm particles in the troposphere. We also calculate a lower limit of 7\u00d7106 km2 for the size of a \"storm\" feature observed on 13 October 1997.", 
  "title": "High-Resolution Infrared Imaging of Neptune from the Keck Telescope", 
  "type": "article-journal", 
  "id": "1229846"
}
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