The Spacecraft
- Mass at launch: 6 tons
- Scientific payload: 2.5 tons
- Total length in operation: 12.5 m
- Total width: 18 m
- Power supply: 2.5 kW (0.8 kW for scientific payload)
- Pointing accuracy
- Coarse pointing: 3 arcmin
- Fine pointing: 0.15 arcsec
- Telemetry rate
- 64 kbits/s general
- 1 Mbit/s high speed down link
The high pointing accuracy in the focal plane of the T-170 telescope
required during time intervals ranging less than 1s to up to 30 hours
is achieved by the fine pointing made of the Attitude Control System by
tilting the secondary mirror around the neutral point according to the
fine error signals derived from a Focal Plane Fine Guidance System.
Return to the Introduction
Return
to the Stellar Physics Mainpage
suv@aip.de - T. Bloecker - 24. Jan. 1996