Astrometric results of observations 
of mutual occultations   and eclipses
of the Galilean satellites of Jupiter in 2003

Emelyanov, N. V.; Gilbert, Rick

doi:10.1051/0004-6361:20064810

Cited by 29 publications

(27 citation statements)

References 14 publications

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“…We use our original method to derive positional and astrometric data from the measurements of satellite fluxes during their mutual occultations and eclipses (see Emelyanov 2000;Emel'yanov 2003;Emelyanov & Gilbert 2006), for a description of the method, also used in Emelyanov (2009) and Emelyanov & Vashkovyak (2009). We adopt Hapke's light scattering law in our solution (Hapke 1981(Hapke , 1984.…”

Section: Extracting Astrometric Data From the Photometry Of Satellitementioning

confidence: 99%

The PHEMU09 catalogue and astrometric results of the observations of the mutual occultations and eclipses of the Galilean satellites of Jupiter made in 2009

Arlot¹,

Emelyanov²,

Varfolomeev³

et al. 2014

A&A

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Context. In 2009, the Sun and the Earth passed through the equatorial plane of Jupiter and therefore the orbital planes of its main satellites. It was the equinox on Jupiter. This occurrence made mutual occultations and eclipses between the satellites possible. Experience has shown that the observations of such events provide accurate astrometric data able to bring new information on the dynamics of the Galilean satellites. Observations are made under the form of photometric measurements, but need to be made through the organization of a worldwide observation campaign maximizing the number and the quality of the data obtained. Aims. This work focuses on processing the complete database of photometric observations of the mutual occultations and eclipses of the Galilean satellites of Jupiter made during the international campaign in 2009. The final goal is to derive new accurate astrometric data. Methods. We used an accurate photometric model of mutual events adequate with the accuracy of the observation. Our original method was applied to derive astrometric data from photometric observations of mutual occultations and eclipses of the Galilean satellites of Jupiter. Results. We processed the 457 lightcurves obtained during the international campaign of photometric observations of the Galilean satellites of Jupiter in 2009. Compared with the theory, for successful observations, the r.m.s. of O-C residuals are equal to 45.8 mas and 81.1 mas in right ascension and declination, respectively; the mean O-C residuals are equal to -2 mas and -9 mas in right ascension and declination, respectively, for mutual occultations; and -6 mas and +1 mas in right ascension and declination, respectively, for mutual eclipses.

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Section: Extracting Astrometric Data From the Photometry Of Satellitementioning

confidence: 99%

The PHEMU09 catalogue and astrometric results of the observations of the mutual occultations and eclipses of the Galilean satellites of Jupiter made in 2009

Arlot¹,

Emelyanov²,

Varfolomeev³

et al. 2014

A&A

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“…These eclipse events provide us unique opportunities for a variety of studies. The historic first measurement of the speed of light was achieved by observations of eclipses of Galilean satellites (Römer 1676), and this kind of observation has recently been used to obtain accurate astrometric data with great precision (Emelyanov & Gilbert 2006;Emelyanov 2009;Mallama et al 2010;Emelyanov et al 2011). The Jovian upper atmosphere was previously investigated through satellite eclipse events (Smith et al 1977;Greene et al 1980;Smith 1980;, which allowed studies of the Jovian atmosphere through Earth-based astronomical observations as opposed to in situ studies by spacecraft missions to Jupiter.…”

Section: Introductionmentioning

confidence: 99%

Near-Infrared Brightness of the Galilean Satellites Eclipsed in Jovian Shadow: A New Technique to Investigate Jovian Upper Atmosphere

Tsumura

Arimatsu

Egami

et al. 2014

ApJ

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Based on observations from the Hubble Space Telescope and the Subaru Telescope, we have discovered that Europa, Ganymede, and Callisto are bright around 1.5 μm even when not directly lit by sunlight. The observations were conducted with non-sidereal tracking on Jupiter outside of the field of view to reduce the stray light subtraction uncertainty due to the close proximity of Jupiter. Their eclipsed luminosity was 10 −6 -10 −7 of their uneclipsed brightness, which is low enough that this phenomenon has been undiscovered until now. In addition, Europa in eclipse was <1/10 of the others at 1.5 μm, a potential clue to the origin of the source of luminosity. Likewise, Ganymede observations were attempted at 3.6 μm by the Spitzer Space Telescope, but it was not detected, suggesting a significant wavelength dependence. It is still unknown why they are luminous even when in the Jovian shadow, but forward-scattered sunlight by hazes in the Jovian upper atmosphere is proposed as the most plausible candidate. If this is the case, observations of these Galilean satellites while eclipsed by the Jovian shadow provide us with a new technique to investigate the Jovian atmospheric composition. Investigating the transmission spectrum of Jupiter by this method is important for investigating the atmosphere of extrasolar giant planets by transit spectroscopy.

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“…We refer to Emelyanov (2000Emelyanov ( , 2003 and Emelyanov & Gilbert (2006) for a more detailed description of the method, which we previously used in our work (Emelyanov 2009). …”

Section: General Assumptionsmentioning

confidence: 99%

Astrometric results of observations of mutual occultations and eclipses of the Saturnian satellites in 2009

Arlot

Emelyanov

Lainey

et al. 2012

A&A

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Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves of the satellites observed during international campaigns of photometric observations of these mutual events.Aims. This work focuses on processing the complete database of photometric observations of the mutual occultations and eclipses of the Saturnian satellites made during the international campaign in 2009. The final goal is to derive new accurate astrometric data. Methods. We develop an accurate photometric model of mutual event observations of sufficiently high accuracy. Our original method is applied to derive astrometric data from photometric observations of the mutual occultations and eclipses of the Saturnian satellites. Results. We process the 26 light curves obtained during the international campaign of photometric observations of the Saturnian satellites in 2009. Compared with the theory TASS 1.7 by Vienne and Duriez, we find that the root mean square of the "O-C" residuals for the 23 highest quality observations are equal to 48.5 and 21.7 mas in right ascension and declination, respectively, we obtain 16.4 and 20.7 mas with the new theory by Lainey and collaborators and 17.3 and 21.6 mas with JPL SAT351 ephemerides. Topocentric or heliocentric angular differences for satellites pairs are obtained for 16 time instants during the time period

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Astrometric results of observations of mutual occultations and eclipses of the Galilean satellites of Jupiter in 2003

Cited by 29 publications

References 14 publications

The PHEMU09 catalogue and astrometric results of the observations of the mutual occultations and eclipses of the Galilean satellites of Jupiter made in 2009

The PHEMU09 catalogue and astrometric results of the observations of the mutual occultations and eclipses of the Galilean satellites of Jupiter made in 2009

Near-Infrared Brightness of the Galilean Satellites Eclipsed in Jovian Shadow: A New Technique to Investigate Jovian Upper Atmosphere

Astrometric results of observations of mutual occultations and eclipses of the Saturnian satellites in 2009

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