Astrometric results of observations at russian observatories of mutual occultations and eclipses of Jupiter’s Galilean satellites in 2009статья
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Аннотация:In 2009, in five Russian observatories photometric observations of Jupiter’s Galilean satellites
during their mutual occultations and eclipses were carried out. Based on these observations, an original
method was used to ascertain astrometric results such as the difference between the coordinates of pairs of
satellites. Fiftythree phenomena were successfully observed. A total of 94 light curves of satellites were mea
sured. The error in the coordinates of satellites due to random errors in photometry, calculated on all data
obtained, was 0.041′′ in right ascension and 0.046″ in declination. The discrepancies between the theory and
observations in these coordinates was found to be 0.060″ and 0.057″, respectively. The results were uploaded
to the common database for all observations of natural satellites of planets at the Natural Satellites Data Cen
ter (NSDC), which is available online at http://www.sai.msu.ru/neb/nss/index.htm. For the first time in the
practice of photometric observations of satellites in epochs of mutual occultations and eclipses a new method
of observation was tested, which eliminates from astrometric results the major systematic errors caused by an
inaccurate account of the background level. The tests were conducted in the Terskol Observatory and the
observatory of the Crimean laboratory of the Sternberg State Astronomical Institute of the Moscow State
University. The application of the new method showed that the elimination of the background level at these
observatories was carried out correctly.