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No. 81 - Swap to HGA2

No. 81 - Swap to HGA2

Report for Period 27 May to 2 June 2007The swap from High Gain Antenna 1 to High Gain Antenna 2 took place during this reporting period, and proceeded according to plan. A single Cebreros pass was skipped to increase cooling of VIRTIS for operation. The use of "delayed TC files" as part of the quadrature operations has worked very well during this period, loading all the operations for an entire week in a single day (31 May).

The table below shows a chronology of the main activities in the reporting period:

MET (Day) Date DOY VPER# Main Activity
565 27/05/07 147 401 Routine Mission Operations
566 28/05/07 148 402 Routine Mission Operations
567 29/05/07 149 403 Pass skipped for cooling
568 30/05/07 150 404 Routine Mission Operations.
Upload of HGA swap products
569 31/05/07 151 405

Routine Mission Operations.
Upload of delayed TC files

570 01/06/07 152 406 Routine Mission Operations.
HGA swap performed at acquisition of signal
571 02/06/07 153 407 Routine Mission Operations

At the end of the last Cebreros pass in the reporting period (DOY 153, 18:00z) Venus Express was orbiting Venus at 114 million km from the Earth. The one-way signal travel time was 380 seconds.

Payload Activities

The instrument was regularly operated as part of the routine plan.
Over the course of three days, from DOY 150 to 152, two ASPERA thermal telemetry parameters (Scanner and DPU) reported Out-of-Limit conditions at switch on. Due to safety concerns, the operation of the payload was temporarily disabled between DOY 152 and 154.

It is thought that recent extended Earth pointing periods in tilted attitude (immediately prior to the swap of the High Gian Antenna) have resulted in deeper than usual cooling of this unit. This results in temperatures lower than allowed at switch on, when ASPERA operations are started during Earth pointing phase. Otherwise the instrument is in good condition.

The instrument was regularly operated as part of the routine plan.

This instrument was OFF and was not operated.

The instrument was regularly operated as part of the routine plan.

Occultation observations were performed over New Norcia on DOY 148, 150 and 152. Two RSI passes were supported from the Canberra 70-m DSN station on DOY 147 and 151.

The instrument was regularly operated as part of the routine plan.

Future Milestones

Special operations are planned during the observations by NASA's Messenger spacecraft on 5 and 6 June.

Quadrature phase operations will continue up to 16 June, DoY 167.

PFS test are being prepared to try to move the scanner during a wheel off-loading (WOL).

Last Update: 1 September 2019
12-Apr-2024 11:15 UT

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