1           1986-01-17.39  Weidenschilling et al. (1990) 
2           1986-01-18.46  Weidenschilling et al. (1990) 
3           1986-01-19.38  Weidenschilling et al. (1990) 
4           1986-01-20.38  Weidenschilling et al. (1990) 
5           1986-01-21.42  Weidenschilling et al. (1990) 
6  1998-11-16--2012-02-29  Lowell