[Source: NASA NSSDC,
https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1987-022A ]
GOES 7 was launched in February 1987 and was a NASA-developed,
NOAA-operated, geosynchronous, and operational
... spacecraft. The cylindrically
shaped spacecraft measured 190.5 cm in diameter and 230 cm in length, exclusive
of a magnetometer that extended an additional 83 cm beyond the cylinder shell.
The primary structural members were a honeycombed equipment shelf and thrust
tube. The VISSR telescope was mounted on the equipment shelf and viewed the
Earth through a special aperture in the side of the spacecraft. A support
structure extended radially out from the thrust tube and was affixed to the
solar panels, which formed the outer walls of the spacecraft and provided the
primary source of electrical power. Located in the annulus-shaped space
between the thrust tube and the solar panels were stationkeeping and dynamics
control equipment, batteries, and most of the SEM equipment. Proper spacecraft
attitude and spin rate (approximately 100 rpm) were maintained by two separate
sets of jet thrusters mounted around the spacecraft equator and activated by
ground command. The spacecraft used both UHF-band and S-band frequencies in
its telemetry and command subsystem. A low-power VHF transponder provided
telemetry and command during launch and then served as a backup for the primary
subsystem once the spacecraft attained orbit.
The spin-stabilized spacecraft carried a visible infrared spin-scan radiometer
atmospheric sounder, meteorological data collection and transmission system,
space environment monitor, energetic particle monitor, and a magnetic field
monitor. GOES 7 was positioned at 98 degrees West in the summer (Atlantic
hurricane season) and 108 degrees West in the winter (Pacific storm season).
For more information on GOES satellites: http://www.oso.noaa.gov/goes/