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  • 1
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    Europa's phase curve - Implications for surface structure (1991)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: 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.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Icarus (ISSN 0019-1035); 90; 30-42
    Format: text
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  • 2
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    UBV photometry of asteroid 433 Eros (1976)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: UBV observations of asteroid 433 Eros were conducted on 17 nights during the winter of 1974/75. The peak-to-peak amplitude of the lightcurve varied from about 0.3 mag to nearly 1.4 mag. The absolute V mag at maximum light, extrapolated to zero phase, is 10.85. Phase coefficients of 0.0233 mag/degree, 0.0009 mag/degree, and 0.0004 mag/degree were derived for V, B-V and U-B, respectively. The zero-phase color of Eros (B-V = 0.88, U-B = 0.50) is representative of an S (silicaceous) compositional type asteroid. The color does not vary with rotation. The photometric behavior of Eros can be modeled by a cylinder with rounded ends having an axial ratio of about 2.3:1. The asteroid is rotating about a short axis with the north pole at 15 deg ecliptic longitude and 9 deg ecliptic latitude.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Icarus; 28; May 1976
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    A search for posteclipse brightening of Io in 1973. I (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Eight eclipse reappearances of the innermost Galilean satellite, Io, were observed during the fall of 1973. The measurements were made using photometers specially designed to cope with the problem of scattered light from Jupiter. Posteclipse brightening of Io was not detected and, if present, was less than our estimated detection threshold of about 0.02 mag.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Icarus; 23; Nov. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    UBV photometry of the Galilean satellites (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: UBV observations of the Galilean satellites made at Lowell Observatory and Cerro Tololo Inter-American Observatory during 1973 and 1974 are reported. The dependence of brightness on solar phase angle for various faces of each satellite is determined. Significant differences in this dependence are found between different faces of the same satellite, between satellites, and between the present results and those of previous investigators. Rotational light and color-index curves are presented for the satellites and compared with earlier work. An apparent secular brightening of all four satellites between 1973 and 1974 is discussed.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Icarus; 26; Dec. 197
    Format: text
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  • 5
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    International planetary patrol observations of Saturn's rings. II - Four color phase curves and their analysis (1979)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: New phase curves for Saturn's rings at an intermediate tilt angle B of about 17 deg are presented. Quantitative results for each of the A and B rings are reported in terms of the opposition effect, phase coefficient, and best logarithmic fit to the phase curve. There was no significant difference between the shape of the phase curves for the two rings in each of the four colors, and a four-parameter multiple scattering model of the rings was consistent with the observations. In this model, the difference in the phase curves for different colors can be explained by a variation in the single scattering albedo with wavelength. The observations allow the particles to have the same composition in the A and B rings, so that their different photometric behavior is explained by differences in optical depth and volume density in the two rings.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Astronomical Journal; 84; Sept
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Origin of longitudinal grooving in Tiu Vallis, Mars - Isolation of responsible fluid-types (1979)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Fluid instability analysis developed for the growth or decay of large, longitudinal roller vortex perturbations imposed at the base of fluids of exponentially stratified viscosities is presented. The origin of longitudinal grooving and fluting in a region of converging flow in Tiu Vallis, Mars, is analyzed, and the propensity of fluids, such as water, mudflow/debris flow, and lava, to develop longitudinal roll patterns as part of their flow field is tested. It is found that the grooving pattern in Tiu Vallis was probably formed by vortex motion in a mudflow or debris-laden slurry, but exact representation of sediment/debris concentration or sediment transport machanism is not yet possible. It is concluded that longitudinal vortex motion modelled in this analysis can develop in water, lava, or ice, but that the specific flow characteristics of these models which include the vortex motion are unreasonable for flow in Tiu Vallis.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Geophysical Research Letters; 6; Sept
    Format: text
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  • 7
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    An atmospheric outburst on Neptune from 1986 through 1989 (1992)
    In:  Other Sources
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    Publikationsdatum: 2019-08-28
    Beschreibung: 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.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Icarus (ISSN 0019-1035); 99; 2; p. 363-367.
    Format: text
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  • 8
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    The albedo of Titan (1986)
    In:  Other Sources
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    Publikationsdatum: 2019-07-12
    Beschreibung: Photometric observations of Titan since 1972 show a cyclical variation of about 10 percent. A minimum value of brightness and albedo apparently occurred in 1984. Spectrophotometric observations, made annualy since 1980 at 8 A resolution, 3295-8880 A, were used to derive the value p-asterisk = 0.156 + or - 0.010 for the integrated geometric albedo in 1984. Variations of the equivalent widths of spectral features were not seen.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 303; 511-520
    Format: text
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  • 9
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    Neptune's cloud structure in 1989 - Photometric variations and correlation with ground-based images (1991)
    In:  Other Sources
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    Publikationsdatum: 2019-07-12
    Beschreibung: 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.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Icarus (ISSN 0019-1035); 90; 299-307
    Format: text
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  • 10
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    The brightness, albedo, and temporal variability of Neptune (1991)
    In:  Other Sources
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    Publikationsdatum: 2019-07-12
    Beschreibung: 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.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 368; 287-297
    Format: text
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