1 1978-10-29.36 Harris & Young (1980) 2 1985-03-19.19 Lagerkvist et al. (1987) 3 1985-03-20.17 Lagerkvist et al. (1987) 4 1985-03-21.17 Lagerkvist et al. (1987) 5 1989-01-25.92 Dotto et al. (1992) 6 1998-02-14--2008-07-30 USNO 7 2006-11-11--2008-09-07 Catalina