5 research outputs found
Mutual positions of the Galilean satellites of Jupiter from photometric observations during their mutual occultations and eclipses in 1997
We report the final results of the 1997 campaign of
photometric observations of the mutual phenomena of the Galilean
satellites carried out at observatories in Kazakhstan, Russia, and
Ukraine. Our results contribute substantially to the
world data bank of such observations
and will allow the model of the motion of Galilean
satellites to be further refined. To facilitate the use of
photometric data, we reduced them by computing the planetocentric
rectangular
coordinate differences of satellite pairs for a number of instants
of time so we deduce the differences for one instant from one
observed light curve.
It is these reduced data that constitute the principal
result of this work. We based our data reduction on the method
which we developed in
earlier papers (Emel'yanov 1999; Emel'yanov 2000). The accuracy
of observations was estimated in the process of reduction. The
paper also describes the equipment used.
Photometry and position observations of Saturnian satellites during their mutual eclipses and occultations in 1995 performed at the Observatories in Russia and Kazakhstan
Photometry of mutual eclipses and occultations of planetary
satellites is a powerful technique to explore these bodies.
Observations of these rare events are a source of much precise
information. In 1995 the Celestial Mechanics Department of
the Sternberg Astronomical Institute (SAI) has organized
the observations of mutual eclipses and occultations of
Saturnian satellites on a number of observatories of the
Commonwealth of Independent States (CIS) — the former
Soviet Union (FSU). The ephemerides of satellites and their
observing conditions have been computed beforehand and mailed
these data to many observatories of CIS. The Crimean
laboratory (CL) of the Sternberg Astronomical Institute, two
observatories of the Fesenkov Astrophysical Institute of the
Academy of Sciences of the Republic of Kazakhstan (FAI AS RK) in
Almaty, and the Main Astronomical Observatory of Russian Academy
of Sciences (MAO RAS) in Pulkovo took part in observations. A
photoelectric photometer was used in CL of SAI, a CCD was employed
to secure satellite images in FAI AS RK, and both CCD and
photographic plates were used in MAO RAS. As a result of this
observing campaign, photometric data and light curves were
obtained for three mutual eclipses and occultations of Saturnian
satellites. A number of position observations made allowed us to
measure relative coordinates of satellites. Astrometric
information has already been derived from photometric data. The
mutual apparent positions of satellites were calculated with an
accuracy of 0\hbox{.\!\!^{\prime\prime}} 002 - 0\hbox{.\!\!^{\prime\prime}} 003. In this paper
observations are described and the parameters characterizing the
observed phenomena are given. The results of observations are
available in electronic form.
This work supported by the Russian Foundation for Basic
Research, projects Nos. 95-02-05042, 97-02-16551
Mutual positions of the Galilean satellites of Jupiter from photometric observations during their mutual occultations and eclipses in 1997
We report the final results of the 1997 campaign of
photometric observations of the mutual phenomena of the Galilean
satellites carried out at observatories in Kazakhstan, Russia, and
Ukraine. Our results contribute substantially to the
world data bank of such observations
and will allow the model of the motion of Galilean
satellites to be further refined. To facilitate the use of
photometric data, we reduced them by computing the planetocentric
rectangular
coordinate differences of satellite pairs for a number of instants
of time so we deduce the differences for one instant from one
observed light curve.
It is these reduced data that constitute the principal
result of this work. We based our data reduction on the method
which we developed in
earlier papers (Emel'yanov 1999; Emel'yanov 2000). The accuracy
of observations was estimated in the process of reduction. The
paper also describes the equipment used.