Following the loss of the Cluster
satellites with Ariane 501
a remplacement was financed. It is composed of the Phenix satellite made from
spare instruments of the first set and 3 new satellites. The satellites were
launched by pairs aboard Soyouz rockets.
The program should be completed in mid-2000. It will cost about $265 million.
Orbit should be 19000/119000 km
External resources:
http://sci.esa.int/cluster/