Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...532a..36z&link_type=abstract
Astronomy & Astrophysics, Volume 532, id.A36
Astronomy and Astrophysics
Astrophysics
Techniques: Photometric, Occultations, Planets And Satellites: Dynamical Evolution And Stability, Celestial Mechanics
Scientific paper
Context. Photometry of mutual events between natural satellites has been shown to be a most effective and accurate ground-based method for obtaining accurate astrometric data by fitting the light curves observed during these events, and is invaluable for developing the orbital models of the natural satellites. Aims: Mutual occultations of J2 Europa by J1 Io (Aug. 28, 2009), J1 Io by J2 Europa (Nov. 9 and Dec. 11, 2009), and J1 Io by J3 Ganymede (Nov. 28, 2009) were observed at Yunnan Observatory during the PHEMU09 international campaign. We calculate the astrometric data of satellites by analyzing and fitting the light curves that we derived. Methods: The model proposed by Emelianov (2003, Sol. Syst. Res., 37, 314) was used to fit the light curves, while taking the Lommel-Seeliger scattering law into account. Results: For each event, we derive dynamical quantities such as the deviation of the observed relative satellite motion from the theoretical motion provided by the relevant ephemeris denoted as Dx and Dy, and the impact parameter and its corresponding mid-time. These results have an accuracy of between about several mas and 90 mas for Dx and Dy, and 0.31-2.97 s for the mid-time. The residuals of the longitude shifts (δl1 for J1 Io and δl2 for J2 Europa) that represent the shifts of the mid-times of the events, are also calculated to be around 10 km with the most accurate available ephemerides.
Photometry is available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/532/A36
Arlot Jean-Eudes
Liu Zhiyi
Zhang Xi-Liang
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