![]() | ![]() |
Astron. Astrophys. 364, 887-893 (2000) AcknowledgementsWe have the great pleasure to thank Dr. D. Nesvorný for many valuable and helpful suggestions, which improve the manuscript greatly. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: January 29, 2001 ![]() |