1           1957-04-28.93  Dunlap & Gehrels (1969) 
 2           1957-05-05.03  Dunlap & Gehrels (1969) 
 3           1957-05-30.99  Dunlap & Gehrels (1969) 
 4           1957-05-31.90  Dunlap & Gehrels (1969) 
 5           1965-02-04.29  Dunlap & Gehrels (1969) 
 6           1967-03-07.33  Dunlap & Gehrels (1969) 
 7           1968-04-29.25  Dunlap & Gehrels (1969) 
 8           1968-05-01.17  Dunlap & Gehrels (1969) 
 9           1977-02-13.40  Hartmann & Cruikshank (1978) 
10           1977-02-13.55  Hartmann & Cruikshank (1978) 
11           1984-10-03.15  Detal et al. (1994) 
12           1984-10-03.15  Detal et al. (1994) 
13           1984-10-05.19  Detal et al. (1994) 
14           1990-03-15.08  Dahlgren et al. (1991) 
15           1990-03-16.10  Dahlgren et al. (1991) 
16           1991-04-14.23  Hainaut-Rouelle et al. (1995) 
17           1991-04-18.18  Hainaut-Rouelle et al. (1995) 
18           2008-10-17.24  Stephens 
19           2008-10-18.23  Stephens 
20  1998-09-29--2009-01-01  USNO 
21  2007-09-03--2010-03-16  Catalina