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No. 71 - First Payload Active Checkout Operations

No. 71 - First Payload Active Checkout Operations

Report for Period 8 December to 15 December 2006The reporting period covers the third consecutive week of active checkout operations with the Rosetta payload. During this period, the operated instruments included ALICE, OSIRIS, ROSINA, VIRTIS, RPC and SREM. In particular, interactive checkout operations were performed with OSIRIS and ROSINA. RPC and SREM remain active in the background throughout the campaign. The other instruments are only activated for execution of their checkout sequences.

All checkout operations were executed smoothly, except for the OSIRIS non-interactive operations scheduled for out-of-ground-coverage execution between 9 and 11 December, which failed because of an instrument anomaly.

The instrument was switched-off by ground as soon as the anomaly was detected during the ground contact on 11 December. A basic health confidence check with OSIRIS, to confirm that the anomaly has not impacted the instrument safety, is being scheduled on 20/21 December.

A total of 5 New Norcia (NNO) passes of 9 to 12 hours commanding were taken during the reporting period. One tracking pass of 4 hours and one delta-DOR measurement have been taken with DSN.

Date DOY Main Activity
1014 08.12.06 342 OSIRIS PC4 - pass 2
Lander Philae switched off
1017 11.12.06 345 ROSINA PC4 - pass 1
1018 12.12.06 346 ROSINA PC4 - pass 2
1019 13.12.06 347 ROSINA PC4 - pass 3
1020 14.12.06 348 ROSINA PC4 - pass 4

At the end of the reporting period (DOY 349) Rosetta was at 303.9 million km from Earth (2.03 AU; one-way signal travel time was 16 minutes 14 seconds). The distance to the Sun was 172 million km (1.15 AU).


The reporting period included one interactive pass dedicated to OSIRIS operations on DOY 342/343, the third non-interactive PC4 block between DOY 343 and 345, and four interactive passes dedicated to ROSINA interactive checkout operations between DOY 345 and 349.

The third PC4 non-interactive block was carried out outside ground station coverage and involved ALICE, OSIRIS, VIRTIS, RPC and SREM. The data acquired during this block were retrieved on ground on DOY 345 and completed as expected during the same pass. The OSIRIS observations failed due to an instrument anomaly that occurred at the beginning of the slot. All other instrument operations were successful. SREM and RPC remain active continuously throughout the Active Checkout scenario, with the exception of occasional RPC switch-off when required by other instruments.

Lander Philae
During the pass on DOY 342/343, the Lander was switched off, thereby concluding the Lander PC4 operations. The Lander Team reported that the secondary battery had been successfully recharged to a level of 80%.

Future Milestones

The Mars Swingby Phase formally started on 28 July. The actual swingby will take place on 25 February 2007, followed by a Deep Space Manoeuvre in April 2007.

The on-going Payload Active Checkout (PC4) will last four weeks, with the last operations scheduled to be completed on 22 December.

The next short-term activities include a thermal characterisation on 27 December, an observation of asteroid Lutetia by OSIRIS between 2 and 4 January 2007, and a test of the pre-eclipse Mars observation attitude on 7 January.

Last Update: 1 September 2019
23-Jun-2024 02:09 UT

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