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Neptune's cloud structure in 1989 - Photometric variations and correlation with ground-based images (1991)

Hammel, H. B. ; Lockwood, G. W. ; Candy, M. ; [et al.]

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Publication Date: 2019-07-12

Description: Ground-based photoelectric photometry in b, y, and the 6190 and 7250 A methane-bands, as well as spectrum scans of the methane 6190 A band and CCD images at 6190 and 8900 A, were obtained for Neptune during Voyager 2's approach of that planet on August 24, 1989. Photometric variations are presently correlated with the disk transit of bright planetary features, and the changes in feature distribution and brightness noted in the results are evaluated for implications bearing on long-term variability. It is suggested that the long-term secular variation is related to a slow change in a size of location of both the bright companion and the Great Dark Spot.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Icarus (ISSN 0019-1035); 90; 299-307

Format: text

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