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No. 148 - Pre-hibernation payload checkout

No. 148 - Pre-hibernation payload checkout

Report for the period 27 November to 17 December 2010This report covers 21 days of Rosetta mission operations. The final payload checkout before the hibernation phase was successfully conducted during the reporting period; all the activities were conducted according to plan and only minor actions remain to be performed in the coming months.

The behaviour of reaction wheel C has greatly improved after the second relubrication exercise and its performance is now considered to be very close to nominal.

During the reporting period, mission operations were conducted using the ESA New Norcia (NNO) ground station and the DSS-14 (Goldstone, 70 metres), DSS-15 (Goldstone, 34 metres), DSS-26 (Goldstone, 34 metres) and DSS-54 (Madrid, 34 metres) NASA Deep Space Network (DSN) antennas.

Main activities during reporting period
DoY Date Pass Activity
332 28-Nov-2010 DSS-65 2469 Monitor
333 29-Nov-2010 NNO 2470 RPC Ion and Electron Sensor (IES) EEPROM Refresh
334 30-Nov-2010 DSS-14 2471 Monitor
335 1-Dec-2010 NNO 2472 PC13 - Lander
336 2-Dec-2010 NNO 2473 PC13 - Lander
337 3-Dec-2010 NNO 2474 PC13 - Lander
339 5-Dec-2010 DSS-54 2476 PC13
340 6-Dec-2010 NNO 2477 PC13
341 7-Dec-2010 DSS-26 2478
NNO 2478
PC13 - Lander & ROSINA
342 8-Dec-2010 NNO 2479 PC13 - Lander & ROSINA
343 9-Dec-2010 DSS-15 2480 PC13 - ROSINA
344 10-Dec-2010 NNO 2481 Monitor
346 12-Dec-2010 DSS-15 2483 Monitor
347 13-Dec-2010 NNO 2484 Monitor
348 14-Dec-2010 NNO 2485 PC13 RSI
349 15-Dec-2010 NNO 2486 Monitor
351 17-Dec-2010 DSS-15 2488
NNO 2488
Monitor

DoY = Day of year, PC13 - Payload Checkout #13

At the end of the reporting period on 17 December, Rosetta was at 649 million km from Earth (4.33 AU); the one-way signal travel time was 36 min 05 sec (2165 sec). The spacecraft's distance from the Sun was 555 million km (3.71 AU).

Spacecraft

Payload Status
ALICE The instrument is currently OFF. PC13 activities have been conducted without problems.
CONSERT The instrument is currently OFF. PC13 activities have been conducted without problems.
COSIMA The instrument is currently OFF. PC13 activities have been conducted without problems.
GIADA The instrument is currently OFF. PC13 activities have been conducted without problems.
MIDAS The instrument is currently OFF. PC13 activities have been conducted without problems.
MIRO The instrument is currently OFF. PC13 activities have been conducted without problems.
OSIRIS The instrument is currently OFF.
ROSINA The instrument is currently OFF. The instrument software was updated on both the nominal and redundant sides; on 9 December (DoY 343), the instrument was activated to calibrate the spacecraft background environment in the same attitude as during the Lutetia fly-by.
RPC The instrument is currently OFF. The Ion and Electron Sensor (IES) EEPROM software was fully refreshed and PC13 activities successfully completed. A small number of error events were recorded during the activities; however none of them are expected to affect operations.
RSI The USO is ON/muted since 3 February 2010 (DoY 032/2010). On 14 December (DoY 348) the standard checkout was conducted. During the test, the transponder showed narrow band lock on the uplink at the switchover times from the temperature-controlled crystal oscillator to the ultra-stable oscillator and vice versa. This unexpected behaviour will be analysed.
VIRTIS The instrument is currently OFF. PC13 activities have been conducted without problems.
Lander (Philae) The instrument is currently OFF. PC13 activities, that included the uplink of a complete new software version on the CDMS, have been conducted according to plan. The few problems recorded during the test were promptly recovered and the instrument was declared ready for the hibernation phase.
SREM The instrument is ON with standard settings since 3 February 2010 (DoY 032/2010).

Future milestones

The spacecraft is now fully configured for the execution of the first rendezvous manoeuvre that is planned for the second half of January 2011, with the first burn leg on 17 January. Due to its magnitude, this manoeuvre has been split into five nominal burns plus an optional extra one in the event that a final correction is needed. The detailed plan for the burns is given in the table below.

First Rendezvous Manoeuvre Burn Details
Burn Date ∆V[ms-1] Duration [min]
1A 17-Jan-2011 300 393
1B 18-Jan-2011 274 371
2A 21-Jan-2011 120 171
2B 23-Jan-2011 80 118
TRIM1 10-Feb-2011 16 33
TRIM2 3-Mar-2011 0 0

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Legal disclaimer
This report is based on the ESOC mission operations report, WOR #148. Please see the copyright section of the legal disclaimer (linked from the home page http://sci.esa.int) for terms of use.

Last Update: 1 September 2019
5-Jun-2020 10:30 UT

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