Four-color photometry of the Galilean satellites

Morrison, David; Morrison, N. D.; Lazarewicz, A. R.

doi:10.1016/0019-1035(74)90058-x

Cited by 83 publications

(29 citation statements)

References 15 publications

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“…While surfaces covered with new, pure, and fine H 2 O particles are typically bright and the albedo can reach close to 1, the actual geometric albedos of Europa, Ganymede, and Callisto are *0.7 , *0.4 (Morrison and Morrison, 1977), and *0.2 , respectively. Surface darkening likely originates from the following two processes.…”

Section: Galilean Moonsmentioning

confidence: 99%

Geology and Photometric Variation of Solar System Bodies with Minor Atmospheres: Implications for Solid Exoplanets

Fujii

Kimura²,

Dohm³

et al. 2014

Astrobiology

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A reasonable basis for future astronomical investigations of exoplanets lies in our best knowledge of the planets and satellites in the Solar System. Solar System bodies exhibit a wide variety of surface environments, even including potential habitable conditions beyond Earth, and it is essential to know how they can be characterized from outside the Solar System. In this study, we provide an overview of geological features of major Solar System solid bodies with minor atmospheres (i.e., the terrestrial Moon, Mercury, the Galilean moons, and Mars) that affect surface albedo at local to global scale, and we survey how they influence pointsource photometry in the UV/visible/near IR (i.e., the reflection-dominant range). We simulate them based on recent mapping products and also compile observed light curves where available. We show a 5-50% peak-totrough variation amplitude in one spin rotation associated with various geological processes including heterogeneous surface compositions due to igneous activities, interaction with surrounding energetic particles, and distribution of grained materials. Some indications of these processes are provided by the amplitude and wavelength dependence of variation in combinations of the time-averaged spectra. We also estimate the photometric precision needed to detect their spin rotation rates through periodogram analysis. Our survey illustrates realistic possibilities for inferring the detailed properties of solid exoplanets with future direct imaging observations.

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Section: Galilean Moonsmentioning

confidence: 99%

Geology and Photometric Variation of Solar System Bodies with Minor Atmospheres: Implications for Solid Exoplanets

Fujii

Kimura²,

Dohm³

et al. 2014

Astrobiology

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“…Nevertheless, referring to Table 2, the values for the observed maximum (θ max ∼ 85) and minimum (θ min ∼ 295) magnitude of Europa are larger than the results of Morrison et al (1974), Blanco & Catalano (1974), but in better agreement with Johnson (1971), Millis & Thompson (1975) and Any discrepancy in the orbital longitudes of maximal and minimal brightness has however no consequence for the general trend of the magnitude bias and hence the determination of the Minnaert parameter. One finds a good agreement for the amplitude with the results of Morrison et al (1974), Morrison & Morrison (1977), Millis & Thompson (1975) and Domingue et al (1991). In particular, the amplitude in B − V, b − y and v − y are small enough so that no further correction is required, hence the amplitude and asymmetry of the light curves between the two different photometric systems are almost similar.…”

Section: Europamentioning

confidence: 61%

“…Although variation of magnitude with orbital phase is a well-known phenomenon for the Galilean satellites (e.g. Morrison et al 1974;Millis & Thompson 1975), it depends on the solar phase angle, the subSolar point and sub-Earth point coordinates, the photometric passband used, and at least for Europa, is far from being a simple function. Its modelling in the Hipparcos photometric band would be less accurate than the other transformations entering in the reduction, thus the observations are not corrected for this effect.…”

Section: Europamentioning

confidence: 99%

Photometry with a periodic grid

Hestroffer

2003

A&A

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Abstract. The Hipparcos satellite successfully gathered astrometric and photometric information for a few solar system objects including natural satellites. In contrast to the case for asteroids, the Hipparcos main-mission does not provide the photometry -in the conventional sense -of planetary satellites. Nevertheless, valuable photometric results can be obtained, such as a modelling of the centre-to-limb darkening of the bodies. We present in this paper results obtained for the photometry with a periodic grid of the satellites J2 Europa and S6 Titan from the Hipparcos main mission and within the FAST data-reduction Consortium. The Minnaert parameter of S6 Titan is found to be k ∼ 0.90 ± 0.02, and for J2 Europa, k ∼ 0.58 ± 0.01. Brightness variations with orbital phase are also given for Europa.

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“…and 2.00 respectively, for conservative scattering. The result shows the behavior of the measured phase variation from 0° to 12° (Morrison et al, 1974). …”

Section: -mentioning

confidence: 99%

“…The high geometric albedo implies a scattering function with a stronger backward scattering component than for a lambert surface. This backward scattered component is seen in the phase variation of the albedo at 0.55 pm, which decreases by about 30% from 0* to 12 * phase angle (Morrison et al, 1974).…”

Section: Introductionmentioning

confidence: 97%