On Wednesday, Mission Specialist and Payload Commander Steve Smith
and Mission Specialist John Grunsfeld will first replace the
telescope's three Rate Sensor Units. Each contains two
gyroscopes. The second major task is installation of six
Voltage/Temperature Improvement Kits between Hubble's solar panels
and its six 10-year-old batteries. The cell telephone-sized kits are
designed to prevent any overheating or overcharging of those
Discovery's systems continue to function well as the astronauts
wind up final preparations for Wednesday's space walks and prepare
for sleep. The spacecraft was in an orbit with a high point of 380
statute miles and a low point of 355 miles.
The next Mission Control Center status report will be issued at 11
a.m. Wednesday or as events warrant.
Go to STS-103 Flight Day 4 Highlights: