Program: ST5
NASA's Space Technology 5 program.
Three micro-satellites demonstrate the benefits of a constellation (string of
pearls) to make simultanous measurements. Will be 100-200 km appart. This
project is called Nanosat Constellation Trailblazer.
To measure, from 3 points at the same time, the Earth's magnetic field. After
one month, the satellites are operating nominaly.
The mission was successful and demonstrated a constellation flight on 24 May
2006 (350 km apart).
http://nmp.jpl.nasa.gov/st5