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. Rosetta Trajectory Correction Manoeuvre On Route For Mars Flyby

This view of Mars against the backdrop of our Galaxy was taken by the wide angle camera (WAC) of the OSIRIS instrument on 3 December 2006, during the last series of instrument check-outs. In the image, Mars is heavily overexposed, surrounded by a halo of scattered light. During the Mars swing-by at the end of February, OSIRIS will make a series of close-up observations of the planet as well as its two moons. Copyright: ESA/MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
by Staff Writers
Paris, France (ESA) Feb 15, 2007
The reporting period covers a period of 2 weeks characterised by preparatory activities for the Mars swing-by (MSB) phase. The Mars swing-by phase formally started on 28 July 2006. The actual swing-by will take place on 25 February 2007, followed by a Deep Space Manoeuvre in April 2007.

During the reporting period the following activities have been conducted:

- Re-dump of Lander EEPROM (Electrically Erasable Programmable Read Only Memory) for MSB observations
- IMP (Inertial Measurement Package) and SSMM configuration for MSB
- Trajectory Correction Manoeuvre (TCM) at MSB - 16 days

All activities have been conducted according to the plan without problems. The navigation campaign for the Mars swing-by is proceeding according to the plan with radiometric data acquired by ESA's ground station in New Norcia (NNO) and NASA's DSN stations (DSS).

At the end of the reporting period (DOY 040) Rosetta was at 317.2 million km from Earth (2.12 AU; one-way signal travel time was 17 minutes 38 seconds). The distance to the Sun was 206.8 million km (1.38 AU).

Spacecraft

AOCS: On 9 February (DoY 040) a Trajectory Correction Manoeuvre has been executed between 02:00 and 04:45 as part of the navigation activities for the MSB. The manoeuvre lasted 54 seconds and the fuel consumption was 58.28 g.

Payload: The reporting period included the following activities:

DoY 029 - Lander Switch ON

The Lander Philae has been switched ON to re-dump the EEPROM tables updated for the MSB observations. The operation was successful and the Lander team could confirm the successful update of EEPROM.

All the instruments have confirmed their go ahead for the MSB operations. The Lander team still has the possibility to update the execution time of their commands should the closest approach time shift by more than one minute with respect to the value predicted in November. The current deviation is in the order of a few seconds.

Future Milestones

The Mars swing-by phase formally started on 28 July 2006. The actual swing-by will take place on 25 February 2007, followed by a Deep Space Manoeuvre in April 2007. Preparation activities for the Mars swing-by will continue in the coming weeks with the following plan:

- DoY 046: Spacecraft pre-configuration for Mars swing-by
- DoY 053: Spacecraft FDIR (Failure Detection Isolation and Recovery) run-down part 1

The navigation campaign will continue its most dense phase with several tracking passes per week and DDOR measurements, both with ESA and DSN stations.

The ground segment validation campaign for the Mars swing-by scenario is nearing completion with only one simulation left to be performed. A successful readiness review meeting has been held with the mission management on 2 February.

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Outstanding In-Orbit Performance Of The Terma Star Tracker On TacSat-2
Herlev, Denmark (SPX) Jan 24, 2007
The Terma Star Tracker team has now received the first ever in-orbit live data from the Terma HE-5AS Star Tracker. The data has been recorded onboard the TacSat-2 spacecraft during the first hours following the successful release from the Minotaur I launch vehicle on Dec 16 2006. The Star Tracker was switched-on exactly one hour after the spacecraft release.

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