No. 47 - Ongoing Lunar Operations
The Integral/XMM transponder has been used to carry out tone ranging radio frequency compatibility tests aiming at two SMART-1 tracking campaigns for the cross support with the Chinese CLTC and the Indian ISRO during 2006.
Future activities are focused on the following:
- End of mission preparation and impact on the Moon selection
- Finalisation of the tone ranging compatibility tests and validation using ESA stations
SMART-1 OD396 Close to Apolune 1790
Elements WRT Moon and its equator of date
|Pericentre Distance (km)||2380.022541|
|Apocentre Distance (km)||4456.635279|
|Semi Major Axis (km)||3418.328910|
|Ascending Node (°)||238.470099|
|Argument of Pericentre (°)||261.884063|
|True Anomaly (°)||179.999996|
|Osculating Orbital Period (h)||4.981682|
The changes since apolune 1756 are as follows:
- semi-major axis +0.5 km
- perilune height +2.8 km
- apolune height -1.8 km
- orbital period +0.1 min
The plot below shows the startracker CCD temperatures for the period covered by this report. As expected CHU2 has suffered from high temperatures during the push-broom operations that ended on 20 December 2005.
Electric Propulsion, Power and Thermal
The Power Subsystem has performed very well during the reporting period. The last eclipse was a moon penumbra from 11:48:28 to 11:46:16 UTC on 24 December 2005, with the batteries performing nominally.
The eclipse season is scheduled to start again on 15 March 2006 at 00:15:15 UTC, with an earth penumbra of a duration of 01:17:41 hours.
EP remained off after ending the re-boost phase.
The Thermal Subsystem has performed very well during the reporting period. The last Push-Broom manoeuvre was on 19 December 2005 from 17:41:07 to 18:27:07, with the thermal mode High to behave as Low to keep the temperatures of the +Y/-Y panels lower to avoid as much as possible start tracker invalidations.
The next Push-Broom period is scheduled to start again around April 2006, when the sun incidence on the +Y/-Y panels during Push-Broom is bellow 30 degrees. This Push-Broom period is planned to be about 3 months long, as was the last one.