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No. 199 - Earth Occultation Season #7
09 September 2009
Report for Period 30 August to 5 September 2009
The Venus Express spacecraft and instruments performed nominally during this week. The seventh Earth occultation season is ongoing, with five observations carried out in this reporting period.
VeRa Earth occultation season #7
The occultation measurements are part of the Venus Express Radio Science Investigations (RSI) performed under the Venus Radio Science experiment (VeRa). For these investigations the VeRa team makes use of the radio links of the spacecraft's communications system. The spacecraft's High Gain Antenna is pointed toward the Earth before the approach to occultation and a dual signal is sent in the S-band and X-band. Just before and after the occultation, the transmitted radio signal passes through the ionosphere and atmosphere of Venus. The effect that this has on the received signal gives valuable information on the composition and characteristics of the atmosphere as a function of altitude.
The 35m ESA deep space antenna at New Norcia (NNO), Australia, was used for receiving the spacecraft's radio signals on ground.
The table below shows a chronology of the main activities:
At the end of the last Cebreros pass in the reporting period (DOY 248) Venus Express was orbiting Venus at 203 million km from the Earth. The one-way signal travel time was 677 seconds.
Last Update: 19 October 2009For further information please contact: SciTech.email@example.com
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