Each observatory has a launch mass, including propellant, of approximately 1,412 pounds (642 kilograms).
When stacked together on the rocket, the observatories measured approximately:
8.9 feet (2.7 meters) long
8.5 feet (2.6 meters) wide
10.5 feet (3.2 meters) high
In space, once solar arrays, booms and antennas were extended, each observatory measures (from tip to tip) approximately:
24.5 feet (7.4 meters) long
28.6 feet (8.6 meters) wide
19.2 feet (5.8 meters) tall
The Johns Hopkins University Applied Physics Laboratory (APL), in Laurel, Md., designed, built, and tested the spacecraft and will operate the twin STEREO observatories for NASA.
