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Title:              The 1.95-2.50 μm Spectrum of J6 Himalia
Authors:            Geballe, Thomas R.; Ore, C. M. Dalle; Cruikshank, Dale P.;
                    Owen, T. C.
Journal:            Icarus, Volume 159, Issue 2, p. 542-544. (Icarus 
                    Homepage)
Publication Date:   10/2002
Origin:             ELSEVIER
Abstract Copyright: (c) 2002 Elsevier Science (USA)
Bibliographic Code: 2002Icar..159..542G

Abstract

The reflectance spectrum of Jupiter's sixth satellite, Himalia, is featureless in the wavelength region 1.95-2.50 μm as seen at a spectral resolution of 0.005 μm, with no absorptions deeper than a few percent. From model calculations we establish an upper limit of 10% by weight of H2O (30-μm grains) mixed intimately in the soil of Himalia, or alternatively 0.3% of the surface covered by exposures of H2O ice spatially segregated from the darker soil. For CH4 and CO2 ices the upper limits in spatially segregated models are both 0.3%.
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Title:              Mutual phenomena involving J5 Amalthea in 2002-2003
Authors:            Vachier, F.; Arlot, J. E.; Thuillot, W.
Affiliation:        AA(Institut de mécanique céleste et de calcul des 
                    éphémerides, IMCCE-Observatoire de Paris 
                    vachier@bdl.fr), AB(Institut de mécanique céleste et 
                    de calcul des éphémerides, IMCCE-Observatoire de Paris 
                    arlot@bdl.fr), AC(Institut de mécanique céleste et de 
                    calcul des éphémerides, IMCCE-Observatoire de Paris 
                    thuillot@bdl.fr)
Journal:            Astronomy and Astrophysics, v.394, p.L19-L21 (2002) 
                    (A&A Homepage)
Publication Date:   10/2002
Origin:             A&A
A&A Keywords:       Amalthea, mutual events, dynamical modeling
Abstract Copyright: (c) 2002: Astronomy & Astrophysics
Bibliographic Code: 2002A&A...394L..19V

Abstract

Every six years mutual eclipses and occultations occur among the Jovian system of satellites. Very accurate astrometric measurements and several physical characteristics of the surfaces can be infered from their observation. This paper is provide predictions of this type of events involving the fifth satellite J5 Amalthea, spanning from November 2002 to June 2003 and to urge astronomers to observe them. Only the predictions of the eclipses of Amalthea by Io are presented, when the distance between Amalthea-Io and Amalthea-Jutpiter is large enough for photometric purposes. A full list of phenomena is available on the server http://www.imcce.fr/Phemu03/phemu03_eng.html
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Title:              Mutual Occultations and Eclipses of Galilean 
                    Satellites of Jupiter in 2002-2003
Authors:            Emel'yanov, N. V.
Affiliation:        Sternberg Astronomical Institute, Universitetskii 
                    pr. 13, Moscow, 119899 Russia. Institute of 
                    Celestial Mechanics and Calculation of Ephemerides, 
                    IMCEE-Observatory of Paris, 77 Avenue 
                    Denfert-Rocherean, Paris, F-75014, France
Journal:            Solar System Research, v. 36, Issue 4, p. 353-354 
                    (2002).
Publication Date:   07/2002
Origin:             KLUWER
Abstract Copyright: (c) 2002 Kluwer Academic Publishers
Bibliographic Code: 2002SoSyR..36..353E

Abstract

Information on the approach of a new epoch of mutual occultations and eclipses in the system of Galilean satellites of Jupiter is presented. The importance of observations of such phenomena is highly emphasized.

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Title:              Astrometry from CCD photometry of mutual events of 
                    Jovian satellites from VBO during 1997
Authors:            Vasundhara, R.
Affiliation:        Indian Institute of Astrophysics, Bangalore 560034, 
                    India
Journal:            Astronomy and Astrophysics, v.389, p.325-333 (2002) 
                    (A&A Homepage)
Publication Date:   07/2002
Origin:             A&A
A&A Keywords:       eclipses, astrometry, ephemerides, occultations, 
                    planets and satellites: general
Abstract Copyright: (c) 2002: Astronomy & Astrophysics
Bibliographic Code: 2002A&A...389..325V

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 degr ; 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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Title:              Astrometric CCD observations of the inner Jovian 
                    satellites in 1999-2000
Authors:            Kulyk, I.; Jockers, K.; Karpov, N.; Sergeev, A.
Affiliation:        AA( Main Astronomical Observatory of Ukrainian 
                    National Academy of Sciences 03680, Golosiiv, 
                    Kyiv-127, Ukraine; Isaac Newton Institute, Kiev 
                    Branch Casilla 8-9,Correo 9, Santiago, Chile), 
                    AB(Max-Planck-Institute for Aeronomy 37191 
                    Katlenburg-Lindau, Germany), AC(International Center 
                    for Astronomical and Medico-Ecological Studies 
                    03680, Golosiiv, Kyiv-127, Ukraine), 
                    AD(International Center for Astronomical and 
                    Medico-Ecological Studies 03680, Golosiiv, Kyiv-127, 
                    Ukraine)
Journal:            Astronomy and Astrophysics, v.383, p.724-728 (2002) 
                    (A&A Homepage)
Publication Date:   02/2002
Origin:             A&A
A&A Keywords:       PLANETS AND SATELLITES: INDIVIDUAL: JOVIAN INNER 
                    SATELLITES, ASTROMETRY
Abstract Copyright: (c) 2002: Astronomy & Astrophysics
Bibliographic Code: 2002A&A...383..724K

Abstract

This paper presents the results of observations of the inner Jovian satellites Thebe, Amalthea, Adrastea and Metis made in October-November 1999 and in November 2000. We provide Delta alpha and Delta delta of Thebe and Amalthea with respect to the Galilean satellites, while the positions of Adrastea and Metis are referred to either the Galilean moons or to Thebe or to Amalthea. All observed positions are compared with theoretical ones. Residual statistics show an inner accuracy of our observations in the range from about 0.1 to 0.9 arcsec. The dependence of the differences of the observed and calculated positions on the orbital longitude is presented for our observations of Adrastea and Metis.

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Title:              Predictions of the mutual events of the Galilean 
                    Satellites of Jupiter occurring in 2002-2003
Authors:            Arlot, J.-E.
Affiliation:        Institut de mécanique céleste et de calcul des 
                    éphémérides - Observatoire de Paris, UMR 8028 du 
                    CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, 
                    France
Journal:            Astronomy and Astrophysics, v.383, p.719-723 (2002) 
                    (A&A Homepage)
Publication Date:   02/2002
Origin:             A&A
A&A Keywords:       PLANETS AND SATELLITES: GENERAL, PLANETS AND 
                    SATELLITES: INDIVIDUAL: JUPITER
Abstract Copyright: (c) 2002: Astronomy & Astrophysics
Bibliographic Code: 2002A&A...383..719A

Abstract

Mutual occultations and eclipses of the Galilean satellites of Jupiter will occur in 2002-2003. This paper provides predictions of these events as well as information useful for their observations. Such events are uncommon, since they occur only every 6 years when the Earth and the Sun pass through the common orbital plane of the Galilean satellites. Therefore, we encourage professional and amateur astronomers to join the networks of observers in order to get as many observations as possible. Data on the predictions of the events are available on the web server of the IMCCE (www.bdl.fr).