STEREO HI - From CMEs to Near Earth Objects: a Unique View of the Heliosphere

The two STEREO Heliospheric Imagers (HI) will have a unique view of the Heliosphere, with a field of view encompassing the entire Sun-Earth line. While the primary objective for HI is to detect and obtain information about the size, velocity and direction of Coronal Mass Ejections (CMEs), the sensitivity and field of view of these instruments can be exploited to extend the scientific scope of the mission. For the first time it will be possible to observe objects in this region of space in three dimensions. Simulated images are being used to determine the problems associated with observing objects from comets and asteroids through to the distribution of interplanetary dust.