1. Astronomical Institute; Academy of Sciences of the Czech Republic; Ondřejov CZ-25165 Czech Republic
2. Faculty of Mathematics; Physics and Informatics; Comenius University; Mlynská dolina Bratislava SK-84248 Slovakia
3. Hungarian Astronomical Association; MCSE; Pf. 148 1300 Budapest Hungary
4. Institute of Rock Structure and Mechanics; Academy of Sciences of the Czech Republic; V Holešovičkách 41 Praha 8 CZ-18209 Czech Republic
5. Czech Geological Survey; Geologická 6 Praha 5 CZ-15200 Czech Republic
6. Astronomical Institute; Slovak Academy of Sciences; Tatranská Lomnica SK-05960 Slovakia
7. Department of Physics and Astronomy; University of Western Ontario; London Ontario N6A3K7 Canada
8. Centre for Planetary Science and Exploration; University of Western Ontario; London Ontario N6A 5B7 Canada