The Explorers' Club, № MCXLIX

Operation AXIOM: The Space Age
The Halley Armada, an internationally coordinated series of space probes to study Halley's Comet: Vega 1 & Vega 2 (U.S.S.R. & France, launched 15 & 21 December 1984), Giotto (European Space Agency, launched 2 July 1985), & Sakigake & Suisei (Japan, launched 7 January & 18 August 1985); all five probes made their closest approaches to Halley's Comet between 6-14 March 1986.

Commentary: The American observatory Spartan Halley was destroyed in the Challenger disaster. The cancelled Space Shuttle mission S.T.S.-61-E (planned to launch 6 March 1986) was also scheduled to conduct observations of Halley's Comet using the ASTRO-1 payload.

An existing space probe, launched in 1978 as the International Sun-Earth Explorer-3, was retasked & renamed the International Cometary Explorer, passing through the tails of Comet Giacobini-Zinner in September 1985 & Comet Halley in March 1986.

Semper exploro.