Comet probes Name From Date Orbit (km) Depart to Date Orbit CO P/Giacobini-Zinner International Cometary Explorer Solar orbit 1985 Sep 11 7862 km, through tail Solar orbit 1985 Sep 11 1978-79A P/Halley Vega-1 Solar orbit 1986 Mar 6 8890 km Solar orbit 1986 Mar 6 1984-125A Suisei Solar orbit 1986 Mar 8 151000 km Solar orbit 1986 Mar 8 1985-73A Vega-2 Solar orbit 1986 Mar 9 8030 km Solar orbit 1986 Mar 9 1984-128A Giotto Solar orbit 1986 Mar 14 605 km Solar orbit 1986 Mar 14 1985-56A