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No. 208 - Mission Operations Update

No. 208 - Mission Operations Update

Report for Period 1 November to 7 November 2009The Venus Express spacecraft and instruments performed nominally during this week.

On 6 November delta differential one-way ranging (DDOR) was performed using the New Norcia and Cebreros ground stations to track the spacecraft. These measurements are performed monthly to support the accurate determination of the ephemeris for the planet Venus that is maintained by NASA's Solar System Dynamics Group.

The DDOR measurement principle uses a technique to highly accurately determine the position of a transmitter in space and relies on observing the time delay between reception of the signal from the transmitter by two ground stations at different positions on Earth. In this case the Venus Express spacecraft is the transmitter and the two ground stations are New Norcia in western Australia and Cebreros in Avila, Spain.

The table below shows a chronology of the main activities:

Date DOY Main Activity
1454 01/11/09 305

Communications pass over Cebreros

1455 02/11/09 306

Communications pass over Cebreros

1456 03/11/09 307

Communications pass over Cebreros

1457 04/11/09 308

Communications pass over Cebreros

1458 05/11/09 309

Communications pass over Cebreros

1459 06/11/09 310

Communications pass over Cebreros.
DDOR with the Cebreros and New Norcia ground stations

1460 07/11/09 311

Communications pass over Cebreros

At the end of the last Cebreros pass in the reporting period (DOY 311) Venus Express was orbiting Venus at 242 million km from the Earth. The one-way signal travel time was 808 seconds.

Payload Activities

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

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

The instrument was not operated during the reporting period.

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

No radio science observations were made during the reporting period.

VIRTIS-M was operated in the visual channels only.

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

Future Milestones

  • Pre-solar conjunction test with the New Norcia ground station on 16 November 2009
  • Pre-solar conjunction test with the Cebreros ground station on 9 December 2009
  • Venus at superior conjunction on 11 January 2010. Venus Express superior conjunction operations: 29 December 2009 to 22 January 2010

Legal disclaimer
This report is based on the ESOC mission operations report, MOR #208. Please see the copyright section of the legal disclaimer (bottom of this page) for terms of use.

Last Update: 1 September 2019
19-Jul-2024 15:16 UT

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