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  • LUNAR AND PLANETARY EXPLORATION  (4)
  • 1990-1994  (4)
  • 1930-1934
  • 1
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    Europa's phase curve - Implications for surface structure (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The surface of the Jovian satellite Europa is characterized on the basis of an analysis of ground photoelectric photometry at 470 and 550 nm and Voyager images. The data are presented in extensive tables and graphs and discussed in detail. At 550 nm, Europa has single-scattering albedo 0.964, opposition-effect amplitude 0.5, opposition-effect width 0.0016, double-lobed Henyey-Greenstein factors b = -0.429 and c = 0.113, and mean roughness angle 10 deg (much lower than on other solar-system objects). From the small roughness and the 96-percent porosity implied by the narrow opposition peak, it is concluded that the surface was formed mainly by endogenic processes. It is also noted that only one of three observational criteria for preferential ion bombardment of the trailing hemisphere are met in Europa.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 90; 30-42
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An atmospheric outburst on Neptune from 1986 through 1989 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Visual photometry and methane-band imaging indicate that Neptune underwent a period of atmospheric activity in the 1986-1989 period with an enhancement of 8900 A CH4-band brightness and an increased standard deviation of the mean yearly magnitudes at visual and near-IR wavelengths. These observations are presently interpreted as due to a localized upwelling source that could be similar to the 'great white spots' that have been periodically observed on Saturn.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 99; 2; p. 363-367.
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    NASA TECHNICAL REPORTS
  • 3
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    Neptune's cloud structure in 1989 - Photometric variations and correlation with ground-based images (1991)
    In:  Other Sources
    Details
    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
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    NASA TECHNICAL REPORTS
  • 4
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    The brightness, albedo, and temporal variability of Neptune (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Sine 1972, the brightness of Neptune at 4720 and 5510 A has slowly varied with an amplitude of 4 percent, apparently anticorrelated with cyclic solar activity. In addition, there is a secular trend towards redder color. The night-to-night variation of brightness tends to be greater in seasons when the planet is relatively bright. From annual spectrophotometric observations at 8 A resolution, 3295-8880 A, the geometrical albedo spectrum was computed for 1982, when the planet was relatively faint, and for 1987, when it was relatively bright. The two spectra do not differ substantially from each other, but yield a significantly higher albedo in the ultraviolet compared with the values published by Neff et al. based on 1981 observations and a different solar irradiance spectrum.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 368; 287-297
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    NASA TECHNICAL REPORTS
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