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No. 91 - Trajectory Correction for Asteroid Steins Flyby

No. 91 - Trajectory Correction for Asteroid Steins Flyby

Report for Period 17 November to 30 November 2007After Rosetta's Earth swing-by of 13 November operations focused on science data downlink, spacecraft reconfiguration and check-out activities, and on the correction of the spacecraft's trajectory.

A total of 12 New Norcia passes were taken during this reporting period. The tracking campaign with the Deep Space Network (DSN) stations was completed on DoY 329. Some of the passes between 19 and 25 November have been used for TM/TC activities as well.

DOY Date Pass Main Activity
321 17/11/07 DSS-25 1359 Tracking Pass
NNO 1359 Science data downlink
322 18/11/07 DSS-26 1360 Tracking Pass
NNO 1360 Science data downlink
323 19/11/07 DSS-15 1361 Science data downlink
NNO 1361 Tracking Pass
324 20/11/07 DSS-26 1362 Science data downlink
NNO 1362 Tracking Pass
325 21/11/07 DSS-26 1363 Science data downlink and NAVCAM B test
NNO 1363 Tracking Pass
326 22/11/07 DSS-15 1364 Tracking Pass
NNO 1364 Trajectory correction manoeuvre
327 23/11/07 DSS-26 1365 Monitor and NAVCAM B test
NNO 1365 Tracking Pass
328 24/11/07 DSS-26 1366 Tracking Pass
329 25/11/07 DSS-25 1367 Tracking Pass
330 26/11/07 NNO 1368 AOCS Checkout 7
331 27/11/07 NNO 1369 AOCS Checkout 7
Reaction wheels stiction test
332 28/11/07 NNO 1370 Monitor
333 29/11/07 NNO 1371 Tracking Pass
334 30/11/07 NNO 1372 Tracking Pass

At the end of the reporting period (DoY 334) Rosetta was at 13.1 million km from Earth (0.088 AU) and the one-way signal travel time was 44 seconds. The distance to the Sun was 139.5 million km (0.93 AU).

Trajectory Correction Manoeuvre

A trajectory correction manoeuvre was executed on 23 November, 00.54 UT, in order to set the proper trajectory for the close encounter with asteroid Steins planned for September 2008. The manoeuvre was executed using accelerometers, and lasted 538 seconds (the time that Rosetta was in Orbit Correction Mode). The commanded Delta-V was 1.5269 ms-1 and the executed Delta-V (as read in spacecraft telemetry) was 1.526107 ms-1. The total fuel consumed (on-board estimate) was 1.6 kg.

The second leg of this correction manoeuvre will be executed in February 2008.

Spacecraft

Payload
During the reporting period some of the instruments have been operating in the final part of the second Earth swing-by observation campaign.

ALICE
The instrument was operated till DoY 321, 16.10 UT.

CONSERT
The instrument is OFF.

COSIMA
The instrument is OFF.

GIADA
The instrument is OFF.

MIDAS
The instrument is OFF.

MIRO
The instrument was operated several times during the Earth swing-by campaign and completed its activities on DoY 322, 12.15 UT.

OSIRIS
The instrument is OFF.

ROSINA
Instrument is ON (with ROSINA's RTOF sensor in stand-by) as part of an out-gassing attempt. The instrument was powered OFF between DoY 331, 21.35 UT, and DoY 332, 03.30 UT, during the reaction wheels (RWs) stiction test.

RPC
The instrument completed its Earth Swing-by operations on DoY 324, 14.00 UT.

RSI
The instrument is in muted status.

VIRTIS
The instrument is OFF.

LANDER Philae
The ROMAP instrument completed its operations on DoY 324, 14.10 UT.

SREM
Since DoY 248 the accumulation settings of the Standard Radiation Environment Monitor are configured for active cruise mode.

Future Milestones

The Earth swing-by phase is now completed and the spacecraft will enter a quiet period. During the next reporting period some tests with the navigation cameras will be performed to prepare for the optical navigation campaign required for the asteroid Steins approach phase next year. The relatively quiet period will also be taken as an opportunity to characterise the solar torques on the spacecraft and some recovery activities on the MIDAS instrument.

Last Update: 1 September 2019
29-Oct-2020 17:44 UT

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