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J/A+A/532/A36      Galilean satellites mutual events in 2009       (Zhang, 2011)

Calculating the relative coordinates of Galilean satellites by fitting the flux variation during the mutual occultations. Zhang X.L., Arlot J.-E., Liu Z. <Astron. Astrophys. 532, A36 (2011)> =2011A&A...532A..36Z
ADC_Keywords: Photometry, CCD ; Positional data ; Solar system Keywords: techniques: photometric - occultations - planets and satellites: dynamical evolution and stability - celestial mechanics Abstract: Photometry of mutual events between natural satellites has been verified to be a most effective and accurate ground-based method for obtaining accurate astrometric data through fitting the light curves observed during these events, and it will be valuable to develop the orbital models of the natural satellites. 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 will calculate the astrometric data of satellites by analyzing and fitting the light curves we got. The same model proposed by N.V. Emelianov (2003SoSyR..37..314E) was used to fit the light curves, with the Lommel-Seeliger scattering law taking into account. 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, impact parameter and mid-time corresponding to the impact parameter, were obtained for each event respectively. These results have an accuracy of about several mas to 90mas for Dx and Dy and 0.31-2.97s for mid-time. The residuals in determination of longitude shifts (delta(l1) for J1 Io and delta(l2) for J2 Europa) explaining the shifts of the mid-times of the events, were also calculated in the section of discussion which is around 10km with the best ephemerides. Description: File table 2 contains the photometric data of mutual occultations between Galilean satellites observed at Yunnan Observatory in 2009, and the number of data is 411. The observational data in this file belongs to four different mutual occultations, 200908281o2, 200911092o1, 200911283o1 and 200912112o1 respectively, which can be distinguished from the date. '200908281o2' represents the event of J1(Io) occulted J2(Europa) occured on 28 Aug, 2009. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 43 411 Points of Galilean satellites' flux observed during mutual occultations
See also: J/A+A/314/312 : Galilean satellites mutual events in 1997 (Arlot 1996) J/A+A/383/719 : Galilean Satellites mutual events 2002-2003 (Arlot, 2002) J/A+A/427/371 : Galilean satellites ephemerides (Lainey+, 2004) J/A+A/437/705 : Observations of PHEMU97 and PHEMU03 at Ukkel (Pauwels+, 2005) J/A+A/493/1171 : Mutual phenomena of Galilean satellites PHEMU03 (Arlot+, 2009) J/A+AS/125/399 : Mutual phenomena of the Galilean satellites (Arlot+ 1997) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Obs.Date Date of mutual occultations occured. 12- 23 A12 "h:m:s" Obs.Time Time of the beginning of exposure 25- 27 F3.1 s texp Exposure time of images 29- 35 I7 --- Fluxr Value of reference satellites' flux during mutual occultations (1) 37- 43 I7 --- Flux Flux of satellites involved in the mutual occultations
Note (1): For the mutual occultations of 200908281o2, 200911092o1, 200911283o1 and 200912112o1, the satellite J3(Ganymede), J3, J2 (Europa) and J3 were chosen as the reference satellites respectively.
Acknowledgements: Xiliang Zhang, zhangxiliang(at)ynao.ac.cn
(End) Patricia Vannier [CDS] 21-Jun-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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