Global Color Variations on Io

Geissler, P. E.; McEwen, A. S.; Keszthelyi, L.; Lopes-Gautier, R.; Granahan, J. C.; Simonelli, D. P.

doi:10.1006/icar.1999.6128

Cited by 111 publications

(148 citation statements)

References 33 publications

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“…For the Galilean moons, the map of Io based on Galileo/ SSI observations (Belton et al, 1992;Geissler et al, 1999;Becker and Geissler, 2005) at 404, 559, and 756 nm was available and used for ar (Fig. 3).…”

Section: Simulationsmentioning

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: Simulationsmentioning

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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“…The majority of paterae on Io (83% of those measured at <3.2 km pixel -1 resolution) have floors that are partially or completely dark (normal reflectance <0.4), but many are potentially mantled with high-albedo material, possibly SO 2 frost from nearby eruptions [Geissler, et al, 1999] (Plate 1). These "ghost" paterae did not have active lava flows associated with them in the recent past, yet they must be young features, given that the global average age of Io's surface is <1 million years old [Johnson and Soderblom, 1982;Phillips, 2000].…”

mentioning

confidence: 99%

Paterae on Io: A new type of volcanic caldera?

et al. 2001

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“…The Joviocentric position and the velocities were computed using E3 (Lieske 1991) and E5 (Lieske 1998) sets of corrections to the Sampson Lieske theory (Lieske 1977). The present study uses the mosaics of Io constructed by Geissler et al (1999) Phillip et al (1997) by utilizing the best image quality and moderate resolution coverage supplied by Galileo SSI (Solid State Imaging instrument) and Voyager 1 and 2. The Hapke's parameters for this satellite were taken from Domingue & Verbiscer (1997).…”

Section: Fit To the 1997 Data Setmentioning

confidence: 99%

“…The O-C in longitude with respect to E5 is lower compared to E3 and is lowest in the case of E5+M. The open and filled triangles represent (Geissler et al 1999). Below: fit using E5 and assuming a uniform surface for Io.…”

Section: The 2o1 Events Of 1991mentioning

confidence: 99%

“…These authors point out that from an albedo map of Io derived by A. McEwen from the 1979 Voyager encounters, J. Goguen concluded that an extensive bright region on Io can displace the satellite's photocenter and geometric-center by about 130 km. Motivated by this, we carried out the present work by using the albedo mosaics of Io and Europa constructed from Galileo images by Geissler et al (1999) and Phillips et al (1997) respectively. We investigate, in a semi-quantitative manner, the possible effects on the ephemerides, constructed from (O-C) in longitudes that were not corrected for the shift of the photo-center.…”

Section: Introductionmentioning

confidence: 99%

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Astrometry from CCD photometry of mutual events of Jovian satellites from VBO during 1997

Vasundhara

2002

A&A

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Abstract. Astrometric results of CCD observations of the mutual events of the Galilean satellites of Jupiter from the Vainu Bappu Observatory are presented. The shifts in the photo-centers on the disks of Io and Europa due to albedo variations inferred from the available mosaics of Galileo imagery are determined. The estimated shifts from ≈90 km East to ≈50 km West on Io and from ≈50 km East to ≈30 km West for Europa during one orbital period are comparable to the accuracies provided by the present-day ephemerides. In a given mutual event series, the mutual events involving a given satellite pair dominate in number and occur nearly at the same orbital longitude within ±20• ; all the events are therefore delayed or all of them advanced depending on the direction of the shift of the photo-center. The implications of including these cumulative and sustained longitude residuals on the constructed ephemerides are discussed.

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Global Color Variations on Io

Cited by 111 publications

References 33 publications

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

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

Paterae on Io: A new type of volcanic caldera?

Astrometry from CCD photometry of mutual events of Jovian satellites from VBO during 1997

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