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No. 42 - Safe Mode Recovery

No. 42 - Safe Mode Recovery

Report for Period 20 to 26 August 2006The reporting period contained a spacecraft hardware safe which occurred on DoY 237 at 18:15 UT. The outage has caused the following impact at mission level: science operations from Safe Mode occurrence until spacecraft recovery to nominal operations (238 11.48) have been skippedUSO switched OFF for about 16 hours

The spacecraft is now back in routine operations and nominal planning for the upcoming week has already been resumed. The table below shows a chronology of the main activities in the reporting period:

MET (Day) Date DOY VPER# Main Activity
285 20/08/06 232 121 Routine science operations
286 21/08/06 233 122 Routine science operations
287 22/08/06 234 123 Routine science operations
288 23/08/06 235 124 Routine science operations
289 24/08/06 236 125 Routine science operations and Orbit Control Manoeuvre (8.17 m/s) at apocentre
290 25/08/06 237 126 Routine science operations
291 26/08/06 238 127 Safe Mode recovery and Routine science operations

At the end of the last Cebreros pass in the reporting period (DOY 238, 15:00) Venus Express was orbiting Venus at 244 million km from the Earth. The one-way signal travel time was 813 seconds.

Payload Activities

ASPERA
The instrument is regularly operated as part of the routine plan.

MAG
The instrument is regularly operated as part of the routine plan. It was switched off by the safe mode at 237.18.16 and was recovered to nominal operation at 238.10.13.

PFS
The instrument is currently OFF and is not included in the routine planning. Next PFS tests in Venus pointing attitude are planned for the first 4 orbits of MTP 6 (24-27 September 2006).

SPICAV
The instrument is regularly operated as part of the routine plan.

VeRA
The USO is nominally powered but muted. During the Safe Mode the USO was powered off for a period of about 16 hours (237.18.16 until 238.10.15). Occultation Observations with USO un-muted took place on DOY 233, 234, and 237.

VIRTIS
The instrument is regularly operated as part of the routine plan.

VMC
The instrument is regularly operated as part of the routine plan. At safe mode transition, the instrument was ON. The safing AP powered off the instrument.

Mission Planning

Short Term Planning
Operations of STP16 have been completed successfully and the planning of STP17 was completed in time. A pre-check of the payload requests for STP18 was also successful.

Medium Term Planning
Venus Express Science Operations Centre (VSOC) and Flight Dynamics (FDyn) products for MTP007 are now available and planning has continued. This planning will also include the conjunction phase. MTP007 is currently only being planned for the periods where the Sun-Earth-S/C angle is greater than 3° and is assuming a carry over of 2.1 Gbit in the SSMM from MTP006. For MTP006 and MTP007 no plan of DSN resources is available yet, therefore analysis is continuing with a fake plan assuming worst case observations duration.

Future Milestones

Throughout the next week focus will be on the planning exercise for MTP7 while short term planning for CP18 and pre-checks for CP19 will commence.

An operational strategy for the upcoming solar conjunction phase in October/November 2006 is being further iterated.

Last Update: 1 September 2019
2-Jul-2022 11:20 UT

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