1           1981-07-25.38  Harris et al. (1989) 
 2           1981-08-03.30  Harris et al. (1989) 
 3           1981-08-05.41  Harris et al. (1989) 
 4           1981-08-07.23  Harris et al. (1989) 
 5           1981-08-08.31  Harris et al. (1989) 
 6           1981-08-09.27  Harris et al. (1989) 
 7           1981-09-03.29  Harris et al. (1989) 
 8           1981-10-23.15  Harris et al. (1989) 
 9           1987-12-25.99  Shevchenko et al. (1992) 
10           1988-01-20.25  Harris et al. (1989) 
11           1988-01-23.20  Harris et al. (1989) 
12           1988-01-23.31  Harris et al. (1989) 
13           1988-01-24.42  Harris et al. (1989) 
14           1988-02-05.28  Harris et al. (1989) 
15           1988-02-06.21  Harris et al. (1989) 
16           1988-02-09.21  Harris et al. (1989) 
17           1988-02-10.28  Harris et al. (1989) 
18           1988-03-23.17  Harris et al. (1989) 
19           1995-09-22.27  Piironen et al. (1998) 
20           1995-09-23.04  Piironen et al. (1998) 
21           1995-09-27.04  Piironen et al. (1998) 
22  1998-04-24--2003-11-10  USNO