1 1992-03-10.12 Barucci et al. (1994) 2 1992-03-11.17 Barucci et al. (1994) 3 1992-03-14.17 Barucci et al. (1994) 4 1998-03-11--2008-01-31 USNO 5 2015-01-03--2016-05-06 Gaia Collaboration et al. (2018)