Natural satellites mutual phenomena observations: Achievements and future
TL;DR: The goal of this paper is to show that some phenomena occurring during the equinox on the giant planets are worth to be observed, and to encourage observations in the next future especially for planetary systems for which no space mission is planned.
About: This article is published in Planetary and Space Science.The article was published on 2019-05-01 and is currently open access. It has received 7 citations till now. The article focuses on the topics: Ephemeris.
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TL;DR: In this paper, the authors show that precision premium does work in about less than 100 arcsecs for two concerned objects, and the relative positional precision can be well fitted by a sigmoidal function.
Abstract: Precision premium, a concept in astrometry that was firstly presented by Pascu in 1994, initially means that the relative positional measurement of the Galilean satellites of Jupiter would be more accurate when their separations are small. Correspondingly, many observations have been obtained of these Galilean satellites since then. However, the exact range of the separation in which precision premium takes effect is not clear yet, not to say the variation of the precision with the separation. In this paper, the observations of open cluster M35 are used to study precision premium and the newest star catalogue Gaia DR2 is used in the data reduction. Our results show that precision premium does work in about less than 100 arcsecs for two concerned objects, and the relative positional precision can be well fitted by a sigmoidal function. Observations of Uranian satellites are also reduced as an example of precision premium.
10 citations
TL;DR: The results of the 2014-2015 Brazilian campaign for 40 mutual events from 47 observed light curves by the Galilean satellites plus one eclipse of Amalthea by Ganymede were presented in this paper.
3 citations
TL;DR: In this article , the authors quantified the uncertainties attainable when applying a coupled estimation strategy to simulated JUICE data, and discussed the challenges that remain to be addressed to achieve such a coupled solution from real observations.
2 citations
TL;DR: In this article, the authors presented a new reduction of the satellite astrometric coordinate differences deduced from the photometric observations of the Galilean satellites of Jupiter during their mutual occultations and eclipses in 1985 and 1990-1992.
2 citations
TL;DR: In this paper, the authors presented 32 new relative positions of Jupiter's Galilean satellites in 2009 and 23 new positions in 2014-2015, respectively, from eight observatories worldwide.
Abstract: Photometric observations of satellites during their mutual occultations and eclipses are a valuable source of astrometric data for studying the motion of natural planetary satellites. Worldwide photometric observation campaigns are organized in order to observe as many phenomena as possible. All the photometric results obtained during such an observation campaign are stored in a single database, and after some time, they undergo astrometric processing. After conducting the campaign and publishing the results, some observers find unused data, which appear valuable. We have collected these photometric observations of mutual occultations and eclipses of Jupiter’s Galilean satellites and processed them to utilize these valuable astrometric data. To obtain astrometric data from the photometric observations, we have applied our original method. The observations come from eight observatories worldwide. As a result, this work presents 32 new relative astrometric positions of Jupiter’s Galilean satellites in 2009 and 23 new positions in 2014–2015. The astrometric accuracy of the new data in comparison with the most developed theory (O–C) is approximately 0.05′′. The internal accuracy, based on estimates for random photometry errors, is 0.02′′.
1 citations
References
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TL;DR: In this article, an approximate analytic solution for the radiative transfer equation describing particulate surface light scattering, taking into account multiple scattering and mutual shadowing, was derived for the interpretation of reflectance spectroscopy of laboratory surfaces and the photometry of solar system objects.
Abstract: An approximate analytic solution is derived for the radiative transfer equation describing particulate surface light scattering, taking into account multiple scattering and mutual shadowing. Analytical expressions for the following quantities are found: bidirectional reflectance, radiance coefficient and factor, the normal, Bond, hemispherical, and physical albedos, integral phase function and phase integral, and limb-darkening profile. Scattering functions for mixtures can be calculated, as well as corrections for comparisons of experimental transmission or reflection spectra with observational planetary spectra. The theory should be useful for the interpretation of reflectance spectroscopy of laboratory surfaces and the photometry of solar system objects.
1,816 citations
"Natural satellites mutual phenomena..." refers methods in this paper
...We used the Hapke scattering laws considered in planetology (Hapke 1981, 1984)....
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TL;DR: In this article, a mathematically rigorous formalism is derived by which an arbitrary photometric function for the bidirectional reflectance of a smooth surface may be corrected to include effects of general macroscopic roughness.
1,185 citations
"Natural satellites mutual phenomena..." refers methods in this paper
...We used the Hapke scattering laws considered in planetology (Hapke 1981, 1984)....
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TL;DR: The measured secular accelerations indicate that Io is evolving inwards, towards Jupiter, and that the three innermost Galilean moons (Io, Europa and Ganymede) are evolving out of the exact Laplace resonance.
Abstract: The extreme geological activity that makes Jupiter's moon Io the most volcanically active body in the Solar System is thought to be the result of tides raised by Jupiter, but it is not known whether the current tidal heat production is sufficiently high to generate the observed surface heat flow Making use of astrometic observations made between 1891 and 2007, Lainey et al have estimated the tidal dissipation in Io by tracking its effect on the orbital motions of the Galilean moons For Io the value is in good agreement with the observed surface heat flow and suggests that Io is close to thermal equilibrium Dissipation in Jupiter is close to the upper bound of its average value expected from the long-term evolution of the system The geological activity on Io, volcanically the most active body in the Solar System, is thought to be the result of tides raised by Jupiter, but it is not known whether the current tidal heat production is sufficiently high to generate the observed surface heat flow Here, a determination of the tidal dissipation in Io and Jupiter is reported; for Io, this is in good agreement with the observed surface heat flow, whereas for Jupiter, dissipation is found to be close to the upper bound of its average value expected from the long-term evolution of the system Io is the volcanically most active body in the Solar System and has a large surface heat flux1,2,3 The geological activity is thought to be the result of tides raised by Jupiter4, but it is not known whether the current tidal heat production is sufficiently high to generate the observed surface heat flow5,6 Io’s tidal heat comes from the orbital energy of the Io–Jupiter system (resulting in orbital acceleration), whereas dissipation of energy in Jupiter causes Io’s orbital motion to decelerate Here we report a determination of the tidal dissipation in Io and Jupiter through its effect on the orbital motions of the Galilean moons Our results show that the rate of internal energy dissipation in Io (k2/Q = 0015 ± 0003, where k2 is the Love number and Q is the quality factor) is in good agreement with the observed surface heat flow5,6, and suggest that Io is close to thermal equilibrium Dissipation in Jupiter (k2/Q = (1102 ± 0203) × 10-5) is close to the upper bound of its average value expected from the long-term evolution of the system7, and dissipation in extrasolar planets may be higher than presently assumed8 The measured secular accelerations indicate that Io is evolving inwards, towards Jupiter, and that the three innermost Galilean moons (Io, Europa and Ganymede) are evolving out of the exact Laplace resonance
348 citations
"Natural satellites mutual phenomena..." refers background or methods in this paper
...In Lainey et al. (2009), where an acceleration of Io corresponding to the dissipation inside the satellite is detected for the first time, the authors stated that ”The observations of mutual phenomena, known to be among the most accurate observations, have a 1σ accuracy of about 0.025 arcsec and…...
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...The progress in dynamical modeling of natural planetary satellites needs to provide accurate astrometric observations made on a long interval of time in order to be able to quantify the parameters of the motion and the secular effects due to tidal dissipation (Lainey et al. 2009)....
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...The predictions have been calculated using the ephemerides server Multisat (Emel’yanov and Arlot, 2008) with the satellite motion model by Lainey et al. (2009)....
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...We encourage further observations to continue improving the quantification of tidal effects which provide constraints on the internal structure of the satellites as demonstrated by Lainey et al. (2009)....
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TL;DR: Fanale et al. as mentioned in this paper used multispectral mosaics, earth-observed spectra, and photometric characterizations to model and globally map the SO2 distribution and abundances, the bolometric hemispheric albedos, and the passive surface temperatures on Io.
106 citations
"Natural satellites mutual phenomena..." refers background in this paper
...The first paper (McEwen et al. 1988) gives the Hapke parameters for the rough surface of the satellite Io....
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TL;DR: In this paper, a re-analysis of the solar phase curves of the icy Galilean satellites demonstrates that the quantitative results are dependent on the single particle scattering function incorporated into the photometric model; however, the qualitative properties are independent.
100 citations
"Natural satellites mutual phenomena..." refers background in this paper
...The authors of the second paper (Domingue & Verbiscer 1997) refined the Hapke function for rough surfaces....
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