Deep Space 1

Deep Space 1 (DS1) is a spacecraft of the NASA New Millennium Program dedicated to testing a payload of advanced, high risk technologies.

Launched on 24 October 1998, the Deep Space mission carried out a flyby of asteroid 9969 Braille, which was selected as the mission's science target. Its mission was extended twice to include an encounter with Comet Borrelly and further engineering testing. Problems during its initial stages and with its star tracker led to repeated changes in mission configuration. While the flyby of the asteroid was a partial success, the encounter with the comet retrieved valuable information. Three of twelve technologies on board had to work within a few minutes of separation from the carrier rocket for the mission to continue.

The Deep Space series was continued by the Deep Space 2 probes, which were launched in January 1999 on Mars Polar Lander and were intended to strike the surface of Mars. Deep Space 1 was the first spacecraft to use ion powered rocketry, in contrast to the traditional chemical powered rockets.