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No. 45 - Rosetta Observations of Deep Impact at Comet Temple-1

No. 45 - Rosetta Observations of Deep Impact at Comet Temple-1

Report for period 24 June to 15 July 2005The spacecraft is in active cruise mode. The reporting period covers the first active science phase of the mission, dedicated to the observation of the NASA Deep Impact probe's encounter with comet Tempel-1.

The spacecraft was slewed to point its remote sensing payload instruments towards comet Tempel-1 on 28 June. The comet was constantly tracked until 14 July, following a complex profile designed to satisfy the observation requirements of the four active instruments, ALICE, MIRO, OSIRIS and VIRTIS. Three of the remote sensing instruments were active continuously from 29 June to 14 July. VIRTIS was operated only for a few hours around the predicted time of encounter of Deep Impact with the comet, on 4 July. Daily passes were taken with the New Norcia station throughout the reporting period, to downlink the scientific data collected during the observations. An average of 60 Mbytes of data were produced and downlinked every day.

The observation campaign was very successful. All instruments operated very well and their science data were collected as planned and are undergoing the first analyses. A few problems occurred with the commanding timing of OSIRIS and with the MIRO instrument but could be recovered in both cases within about 24 hours, with minor impact on the overall instrument operations and data return. The exercise was the first scientific planning and operations scenario over large scale and an extended period of time for the Rosetta mission. It provided an important experience and a wealth of lessons learned which will be very useful to design the spacecraft operations around Rosetta's target comet 67 P/Churyumov-Gerasimenko.

Taking advantage of the long period of daily contact with the spacecraft, software maintenance activities were carried out for two instruments, Rosina on 6 and 7 July, and ALICE on 14 July. Rosina completed the software modifications required for the DFMS instrument and the related commissioning activities. Also a small maintenance activity was carried out on COSIMA on 28 June.

SREM was always active in the background for the entire period.

A total of 18 New Norcia passes of a max duration of about 9 hours commanding were taken over the reporting period. A DSN proficiency pass was taken on 14 July with the DSS-25 station.

NNO Pass

Date

DOY

Main Activity

485

28.06.05 179 ALICE star calibration + COSIMA TMU error reset

486

29.06.05 180 Start Deep Impact observations

487

30.06.05 181 Monitor - downlink science data

488

01.07.05 182 Monitor - downlink science data

489

02.07.05 183 Monitor - downlink science data

490

03.07.05 184 Monitor - downlink science data

491

04.07.05 185 Monitor - downlink science data

492

05.07.05 186 Downlink science + TC timeout to 3 days

493

06.07.05 187 Downlink science + Rosina DFMS SW upload

494

07.07.05 188 Downlink science + Rosina DFMS SW upload

495

08.07.05 189 Monitor - downlink science data

496

09.07.05 190 Monitor - downlink science data

497

10.07.05 191 Monitor - downlink science data

498

11.07.05 192 Monitor - downlink science data

499

12.07.05 193 Monitor - downlink science data

500

13.07.05 194 Monitor - downlink science data

501

14.07.05 195 Monitor - ALICE SW cleanup + TC monitor to 9 days

502

15.07.05 196 Monitor - Service 19 off

At the end of the reporting period (DOY 196) Rosetta was at 87.1 million kilometres from the Earth. The one-way signal travel time was 4 minutes 50.5 seconds.

Last Update: 1 September 2019
18-Jun-2024 14:17 UT

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