Herschel Status Report - January 2011
25 January 2011 15:34
Report for period 9 December 2010 to 20 January 2011
Mission operations of the Herschel space observatory continued nominally during the reporting period, with the spacecraft and subsystems all performing as expected. The first observations from the first in-flight Open Time (OT1) programmes have been carried out.
The spacecraft continues to be in good health and has operated nominally during the reporting period, except for a few star tracker anomalies encountered on two successive days just before Christmas. On the first day it was found that the satellite had declared the standard star tracker (STR-1) unhealthy and autonomously reconfigured operations to STR-2. The standard configuration was restored during the ground station pass. On the following pass it was found that both STR-1 and STR-2 had been declared unhealthy, albeit for different reasons. The star tracker configurations were returned to nominal again, and have remained nominal ever since.
The three instruments have operated nominally for nearly the whole of the reporting period. At the expense of some observing time a SPIRE single event upset (SEU) had to be recovered from. Two other SEUs occurred with HIFI, but because the instrument was inactive during both events they could be recovered from without any loss of observing time.
The first observations from the approved Open Time (OT1) programmes have been carried out. These programmes were selected from the proposals received in response to the first in-flight call for observing proposals (see the status report from November 2010). Completion of the Key Programmes (KPGT and KPOT) and the first in-flight Guaranteed Time (GT1) observations continues to take precedence, but OT1 observations are now also being inserted into the schedule. These help to maintain the highest possible scheduling efficiency for Herschel when no KP or GT1 observation of appropriate duration and compatible with the attitude constraints is available.
As of 13 January 2011, the completion of the different programme parts was:
For more details of these different programme parts, see the "overview of Herschel observing" linked from the right-hand menu.