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IAA Transactions, No. 8, ``Celestial Mechanics'', 2002
Celestial Mechanics in Internet ---
Russian web­site
V. S. Ural'skaya, N. V. Emelianov
Sternberg Astronomical Institute, Moscow, Russia
Our main goal is to create a professional site in Internet, containing ephemeris
service, database of observations, bibliographic references and information on
natural satellites of planets. Simultaneously, we solve a problem of providing
Russian experts in celestial mechanics with a maximum quantity of information
necessary for their joint work and cooperation with foreign colleagues.
The most complete databases in the world on celestial mechanics is located
in two sites in Internet. The first one is a site of JPL Solar System Dynamics
Group, NASA, that contains the information on planets and their satellites and
a service Horizons for calculation of ephemeris of planets and satellites.
Other information site is proposed by the Institute of Celestial Mechanics and
Calculation of Ephemeris (IMCCE) in Paris, which has an extensive database
on natural satellites of planets. A bibliography on natural satellites of plan­
ets is made and permanently being updated in IMCCE; due to participation
of N. V. Emelianov Russian publications on observations often unknown to west­
ern readers are also included. This bibliographic database being specialized in
natural satellites of planets is considerably more convenient for the experts in
comparison with the bibliography submitted in ADS Abstract Service.
A site ``Celestial Mechanics'' presently being created in Celestial Mechanics
department of Sternberg Astronomical Institute (SAI) will give one more oppor­
tunity get information in some aspects of celestial mechanics. Its basic purpose is
to create a database on planet's natural satellites. Up to now, the drawing up and
the presentation in Internet of the information on natural satellites of planets in
Russian are completed. For all satellite systems of planets the full information is
given including physical and orbital data, form and size of satellites, elements of
their rotation. The complete information, orbital characteristics and observations
of new distant satellites of Uranus, Saturn, Jupiter discovered in 1997--2000 are
also available. The ephemerides for new satellites are calculated for the period of
the planet visibility in 2001--2002.
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Ephemeris tool for all satellites of planets is already created and published by
N. V. Emelianov (1996). It presents a software with friendly interface and graphic
representation of ephemerides. The task of granting of access to this ephemeris
service through Internet is now being solved. Several independent theories con­
structed on the basis of observations are necessary for each satellite of planets as
the theories are rather complicated and the probability of a mistake of a theory
is great. Besides, different methods allow different accuracy and some groups of
observations have systematic errors. Therefore, the third version for calculation
of ephemerides is necessary.
In 2002--2003 there will be rare events in system of Galilean satellites of
Jupiter --- mutual occultations and eclipses, which photometric observations are
very effective for studying satellite dynamics. The significant part of this phenom­
ena can be observed only at Russian observatories. Therefore, the participation
of Russian observers in the world observation campaigns of mutual events helps
``to rescue'' up to 20% of the valuable astrometric data. The Russian part of our
site contains all necessary information for observations including ephemerides.
It will help to organize observation campaign of events of Galilean satellites in
2002--2003.
Now our site offers general information in celestial mechanics, seminars and
conferences, monographs on celestial mechanics in Russian, lists of Russian and
foreign astronomical journals, astronomical organizations, electronic addresses
and telephones of the active persons in celestial mechanics and some other data.
There is also some information on the teaching in celestial mechanics in Moscow
State University (MSU), about Chair of Celestial Mechanics, Astrometry and
Gravimetry of Physical Faculty MSU, and also about the Celestial Mechanics
Department SAI, its researchers and their publications.
Among the nearest tasks of the Celestial Mechanics department SAI there
are numerical modelling of motion of distant satellites of planets, and also ajust­
ing models of some satellites on observation data. Besides, ephemeris service of
natural satellites of planets will be put in access through Internet, and also the
specialized bibliographic database will be created.
References
1. Emel'yanov N. V. A New Tool for Providing Observations of Planetary Satel­
lites with Ephemerides. Astron. Letters, 1996, 22, 135--137.
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