— Ch. 1 · The Halley Armada Overview —
Halley Armada.
~3 min read · Ch. 1 of 6
Five successful space probes converged on Halley's Comet during its 1986 passage through the inner Solar System. This coordinated effort formed what historians now call the Halley Armada. The group included one probe from the European Space Agency, two joint projects between the Soviet Union and France, and two probes from Japan's Institute of Space and Astronautical Science. NASA did not contribute a probe to this historic armada. Without these five spacecraft, humanity would have lacked critical data about the comet's structure and behavior. The mission marked a rare moment of international cooperation in deep space exploration.
Giotto And Close-Up Imaging
ESA launched Giotto to achieve the closest approach of any probe to a comet nucleus. On the 14th of March 1986, it flew within 596 kilometers of Halley's center. This distance allowed Giotto to capture the first close-up color images of a comet nucleus ever taken by human technology. Measurements from other probes enabled Giotto to reach this proximity instead of passing at 4,000 kilometers. The images revealed a dark, irregularly shaped object resembling a dirty snowball. Scientists used these visuals to understand how comets release gas and dust when heated by the Sun.Soviet French Joint Ventures
The Vega missions represented a unique collaboration between the Soviet Union and France under the Intercosmos program. Vega 1 approached Halley on the 6th of March 1986, while Vega 2 followed three days later on March 9. Both spacecraft dropped balloon probes and landers onto Venus before continuing their journey toward the comet. Vega 2 passed within 8,030 kilometers of Halley, while Vega 1 reached 8,889 kilometers. These dual-purpose missions demonstrated complex engineering capabilities during the Cold War era. The balloons provided atmospheric data from Venus that complemented the cometary observations.