|GeoForschungsZentrum Potsdam||Deutsches Raumfahrt-Kontrollzentrum|
CHAMP Bulletin No. 5
July 20, 2000, 16:00 UTC
July 21, 2000, 17:00 UTC
Tonight CHAMP goes into its 100th revolution. The commissioning will be continued in order to start routine operation in calendar week 31. Because of the positive overall situation, there won't be a CHAMP Bulletin during the week-end.
Satellite bus systems
Power: The battery charge level is stable.
Thermal system: All temperatures are within the designed range and stable over the orbit.
Attitude and orbit control: Attitude control and gas consumption show nominal values. Into the investigation of the error leading to the failure of the coarse earth/sun sensors (see Bulletin No. 2) the examination of possible overheating phenomena is included.
Onboard data handling system: The onboard processor and software run correctly.
Telemetric system: A stable transmission from/to the satellite is secured.
More detailed analyses of the magnetic field measurements confirm the excellent magnetic cleanliness of the CHAMP satellite. Recordings of the laser ranging station Graz confirm a surprisingly low measurement uncertainty (caused by the laser reflector) of less then 5 mm.
Flight operations run nominally. NASA generously continues its satellite control support.
The CHAMP orbit is intensively tracked and with very high accuracy being recovered.
The most important average orbit paramerters are: