|
The MESSENGER spacecraft is starting to come
alive. Much of the propulsion system has now been integrated and
tested. Since the spacecraft is not complete, some components
are simulated using special electronics test equipment that allows
full up testing of newly installed hardware. Here an engineer
can be seen working on the Power Distribution Unit (PDU) -- see
May 15 image -- during the propulsion system checkout.
Time-lapse sequences (6.59
MB version or 677 KB
version) show how engineers can turn the spacecraft through 360
degrees of rotation with the Turnover Fixture and spin the spacecraft
on its z-axis by turning the Rotisserie Hand Crank. In this orientation
many key components of the spacecraft are visible. The digital
Sun Sensor (one of six) plays a critical role ensuring that the
spacecraft does not turn the Sunshade away from the Sun. The Solar
Array Drive Electronics work to keep the solar panels in the correct
orientation to balance the need for power and the temperature
of the surface of the panel. The Integrated Electronics Module
is one of two main computer processors that control all functions
of the spacecraft -- see June
26 image.
Last updated: August 11,
2003
|
