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No. 126 - Mission Operations Update

No. 126 - Mission Operations Update

Report for Period 28 November to 25 December 2009The reporting period covers four weeks of nominal operations for the Rosetta spacecraft. Following the successful completion of the mission's last Earth swingby in the previous reporting period, all instruments are currently switched off. The spacecraft is now cruising towards asteroid Lutetia. Several activities required for the refresh of all spacecraft Electrically Erasable Programmable Read Only Memory (EEPROMs) were conducted during the reporting period.

Mission operations have been conducted with support of the ESA New Norcia (NNO) and Cebreros (CEB) ground station, as well as the NASA DSN ground stations Goldstone (DSS-24), Canberra (DSS-45) and Madrid (DSS-54 & DSS-65).

DOY Date Pass Main Activity
333 29/11/09 CEB 2104

Monitoring pass

335 01/12/09 DSS-45 2106

Safeguard memory EEPROM refresh

337 03/12/09

DSS-24 2108
DSS-54 2109

Clean-up of solid state mass memory
Monitoring pass

342 08/12/09

CEB 2113

Monitoring pass

343 09/12/09

CEB 2114

The strobing flag is set to MGA (medium gain antenna)

344 10/12/09 DSS-54 2115

Monitoring pass

346 12/12/09 DSS-65 2117

Monitoring pass

348 14/12/09 NNO 2119

Monitoring pass

350 16/12/09

NNO 2121

MIRO software patch test

352 18/12/09

NNO 2123

Monitoring pass

355 21/12/09

NNO 2126

Monitoring pass

At the end of the reporting period (DoY 359) Rosetta was at 31.22 million km from Earth (0.2 AU) and the one-way signal travel time was 104 seconds. The distance to the Sun was 161.55 million km (1.07 AU).

Spacecraft

Payload
All instruments are now switched off. The Standard Radiation Environment Monitor (SREM) continues to run in the background.

ALICE
The instrument is currently OFF.

CONSERT
The instrument is currently OFF.

COSIMA
The instrument is currently OFF.

GIADA
The instrument is currently OFF.

MIDAS
The instrument is currently OFF.

MIRO
The instrument is currently OFF.
MIRO was operated on DoY 349 to test the updated software patch. The test was successful and the patch will now be coded in on-board control procedures (OBCPs) to limit the number of telecommands required at switch ON.

OSIRIS
The instrument is currently OFF.

ROSINA
The instrument is currently OFF.

RPC
The instrument is currently OFF.

RSI
The instrument is muted.

VIRTIS
The instrument is currently OFF.

LANDER Philae
The instrument is currently OFF.

SREM
Since DoY 251/2009 the accumulation settings are configured for active cruise mode.

Future Milestones

Rosetta is now cruising towards asteroid Lutetia. The encounter with the asteroid will take place in July 2010.

In January 2010 the spacecraft will undergo a major test activity when the Deep Space Hibernation Mode will be commissioned. This activity will require the support of several ground stations and will be the validation of the operating mode which the spacecraft will use for a period of about 2.5 years, from June 2011 till January 2014, during its passive cruise to comet 67P/Churyumov-Gerasimenko.


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This report is based on the ESOC mission operations report, WOR #126. Please see the copyright section of the legal disclaimer (bottom of this page) for terms of use.

Last Update: 1 September 2019
10-Jul-2020 10:13 UT

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