Perihelion 1 – December 1986
Perihelion 2 – April 1987
Perihelion 3 – July 1987
Perihelion 4 – September 1987
Perihelion 5 – December 1987
Perihelion 6 – April 1988
Perihelion 7 – June 1988
Perihelion 8 – September 1988
Perihelion 9 – December 1988
Perihelion 10 – Spring 1989
Perihelion 11 – Summer 1989
Perihelion 12 – Autumn 1989
Perihelion 13 – Winter 1989
Perihelion 14 – Spring 1990
Perihelion 15 – Summer 1990
Perihelion 16 – Autumn 1990
Perihelion 17 – Winter 1990
Perihelion 18 – Spring 1991
Perihelion 19 – Summer 1991
Perihelion 20 – Autumn 1991