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ESA On Target For Rosetta Mars Swing By February 25

File image of the Rosetta spacecraft.
by Staff Writers
Paris, France (ESA) Jan 16, 2007
During the past several weeks ESA's Rosetta mission management team has begun the first preparatory activities for the Mars Swing-by (MSB) phase. The MSB Phase formally started on 28 July 2006. The actual Mars 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:

OSIRIS observations of asteroid Lutetia: the scientific data are being processed by the OSIRIS team

Thermal characterisation for the Mars Swing-by attitude, with a solar aspect angle (SAA) of 165 at 1.25 AU. This activity has proven the feasibility of the MSB scenario from a spacecraft point of view. A final go-ahead shall be given by the Lander team after having analysed the internal temperatures

Switch-over activities for the Attitude and Orbit Control Measurement System Interface Unit (AIU)

On-board sofware maintenance (OBSM) activities for intermediate Sun distance conditions and MSB preparation. With this activity the spacecraft is configured to operate in the current environment with respect to the Sun, and the Electrically Erasable Programmable Read Only Memory (EEPROM) AOCS software is such that it can operate in the eclipse conditions as required for the MSB

All activities have been conducted according to the plan without any problems. A double SEU (single event upset) has been detected by the SSMM in one of the memory modules, recovery activities are being conducted according to the procedure and without any impact on operations.

A total of 8 New Norcia (NNO) passes (4x8h commanding, 4x4h tracking) were taken during this period and 2 DDOR measurements were performed. DSN support consisted in 9x4h tracking passes and 2 DDOR measurements.

At the end of the reporting period (DOY 012) Rosetta was at 313.5 million km from Earth (2.09 AU) and the one-way signal travel time was 17 minutes 26 seconds. The distance to the Sun was 189.4 million km (1.26 AU).

Spacecraft The thermal behaviour of the spacecraft is nominal and stable. On DOY 010 the system has been configured for intermediate Sun distances (ITM), including the required Thermal Control Table (TCT) updates.

Payload The reporting period included off-line activities for OSIRIS (observations of asteroid Lutetia on DOY 002 to 004) and the lander Philae (thermal characterisation for MSB on DOY 007). SREM was operating in the background during the reporting period.

Both activities have been conducted according to the plan and data have been made available to the PI teams for further analysis.

Preparation activities for the MSB have started on DOY 010 with the configuration of the spacecraft on-board software maintenance (OBSM) for this phase. They will continue in the coming weeks with the following plan:

DOY 024: Update of lander Philae EEPROM DOY 031: IMP configuration DOY 039: Trajectory correction manoeuvre The navigation campaign will enter now its most dense phase with several tracking passes per week and DDOR measurements, both with ESA and DSN stations.

The ground segment will now start the formal validation campaign for the Mars Swing-by scenario. This will include a set of scenarios simulations, review meetings, and navigation reports.

Related Links
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Integral Systems Awarded Contract For Taiwan's NSPO Ground Segment
Lanham MD (SPX) Jan 08, 2007
Integral Systems has announced that it has been awarded a sole-source contract to upgrade Taiwan's NSPO's (National Space Organization's) existing mission operations system to simultaneously operate the NSPO's new Argo satellite and the existing FORMOSAT-2 and FORMOSAT-3/COSMIC spacecraft.







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