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No. 187 - High Gain Antenna Swap

No. 187 - High Gain Antenna Swap

Report for Period 7 June to 13 June 2009The Venus Express spacecraft and instruments performed nominally during this week of quadrature operations. The swap from High Gain Antenna 2 (HGA2) to HGA1 and the associated 180° flip of the spacecraft around its Z-axis were successfully executed prior to the Cebreros ground station pass on 8 June (DOY 159).

The HGA swap and the attitude flip were performed as part of the current quadrature operations: the spacecraft entered an outbound quadrature phase on 29 May, and this phase will last until 3 July 2009. Quadrature phases occur regularly and are defined by the periods in the orbit of the planet Venus during which the Sun-spacecraft-Earth angle is between 75° and 95°.

The HGA1 will be used from now up to the mission's next (inbound) quadrature phase, when the swap back to HGA2 will be performed, in about 14 months time.

The table below shows a chronology of the main activities:

MET
(Day)
Date DOY Main Activity
1307 07/06/09 158

Communications pass over Cebreros

1308 08/06/09 159

Telemetry bit rate changed from 28 kbps to 228 kbps, consistent with the HGA swap.
Swap from HGA2 to HGA1.
Communications pass over Cebreros

1309 09/06/09 160

Communications pass over Cebreros

1310 10/06/09 161

Communications pass over Cebreros

1311 11/06/09 162

Communications pass over Cebreros

1312 12/06/09 163

Pass skipped

1313 13/06/09 164

Communications pass over Cebreros

At the end of the last Cebreros pass in the reporting period (DOY 164) Venus Express was orbiting Venus at 114.34 million km from the Earth. The one-way signal travel time was 381 seconds.

Payload Activities

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

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

PFS
The instrument was not operated during the reporting period.

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

VeRA
No measurements were taken during the reporting period.

VIRTIS
VIRTIS-M was operated in the visual channels only.

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

Future Milestones

  • End of current outbound quadrature phase: 3 July 2009

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This report is based on the ESOC mission operations report, MOR #187. Please see the copyright section of the legal disclaimer (bottom of this page) for terms of use.

Last Update: 1 September 2019
29-Oct-2020 17:00 UT

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