1 H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009 1 Status of BepiColombo Harri...

1H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009

1

Status of BepiColombo

Harri LaaksoESA/ESTEC, Code SRE-OS, Noordwijk, The Netherlands

H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009


Launcher: Ariane 5

Launch date: 21-Jul-2014 MOI date: 21-May-2020 (5.8 year cruise to

Mercury by electric propulsion) Backup: 06-Aug-2015 31-Oct-2021 (6.2

years)

Launch strategy: Direct escape 1-year Earth-to-Earth transfer

Earth, 2 Venus, 4 Mercury flybys/gravity assists

Gravity capture into Mercury orbit / Final Mercury orbit adjustment by chemical propulsion

Science operations: 1 year nominal plus 1 year extended

Mission Design Overview


Experiment

IPDR AssessmentBELA ISA MERMAG MERTIS MGNS MIXS MORE PHEBUS SERENA

SIMBIO-SYS

SIXS

DESIGN STATUS ?

SCI. PERFORM.

INTERFACES - EID BRESOURCES

FOPS - OB S/W

PA PROGRAMME

FUNDG. / SCHEDULE

Delta IPDR YES NO NO NONO

(PA)NO YES NO NO

NO(YES)

NO

Summary of IPDR Results


Experiment Allocation

[kg]

EID B Dr 3 CBE [kg]

Declared

Margin

Post IPDR Alloc. [kg]

Marginto Alloc.

Remarks

BELA 12.0 13.3 15% 13.0 12% latest est. 13.5 - 14 kg, savings being identified

ISA 5.3 5.7 0% 6.0 5% savings to be identified

MERMAG 1.8 1.8 17% 1.8 17% power supply redundancy expected to reduce margin

MERTIS 3.3 3.3 8% 3.3 8% -

MGNS 5.2 5.2 7% 5.2 7% regarded small

MIXS 7.3 7.3* 7% 8.8 7% regarded small 1.5 kg base plate added

MORE 3.5 3.5 15% 3.5 15% -

PHEBUS 6.6 7.5 6% 7.5 6% savings to be identified

SERENA 5.4 5.6 0% 6.3 12% marginal for consortia

SIMBIO-SYS

8.3 10.1** 10% 10.6** 15% significant design optimisation pending

SIXS 1.3 2.0 13% 2.0 13% Local radiator added

TOTAL 60.0 65.3 8.5% 68.0 10% regarded small* excl. 1.5 kg MIXS base plate; ** excl. thermal straps (S/C) Experiment unit interconnection harness (ca. 6 kg) not included

MPO Payload Resources - Mass


MPO Payload Resources - Power

Experiment Allocation

[W]

EID B Dr 3

CBE [W]

Re-Allocati

on(TBC)

Remarks(allocation is on orbital average)

BELA 49 36 38 orbital average, full mode 49 W; re-allocation possible

ISA 6 12 10 power driven by thermal control

MERMAG 5 4.6 5 -

MERTIS 8 13 12 re-allocation TBD

MIXS 12 16 14 value is for full mode

MGNS 4 4.5 4.5 -

MORE 30 37 37 only for orbits with GS contact

PHEBUS 4 3.8 4 orbital average, full mode 23 W

SERENA 21 22 22 22.4 W for full science mode

SIMBIO-SYS

23 25 25 32.5 W for full science mode

SIXS 2 2.5 2.5 -

TOTAL 164 139/176

142/179 operations may be seasonally constraint

Operational scenarios under study by SOC; re-allocation pending further assessmentLimitation to 100 W baseline for perihelion or certain mission phases


Experiment EID B Status

BELA Draft 3 finalised and signed as PDR reference, detailed mech. update pending

ISA Draft 3 finalised and signed

MERMAG Draft 3 finalised and signed

MERTIS Draft 3 finalised and signed

MGNS Draft 3 finalised and signed

MIXS Draft 3 finalised and signed, update required for base-plate implementation

MORE Draft 3 finalised and signed

PHEBUS Draft 3 finalised and signed

SERENA Draft 3 finalised and signed, possible update needed for optimised accommodation

SIMBIO-SYS Draft 3 finalised and signed, significant update expected for potential new configuration

SIXS Draft 3 finalised and signed, Draft 4 for radiator optimisation in work

EID B Issue 1 with configuration control to come by summer / early autumn this year !!

MPO Payload EID-B Status


Open P/L procurement issues: Solutions to be addressed without delay

Firm up and finalise P/L experiment interface definition for H/W phase: Partly achieved, but still missing elements Consolidation to be addressed without delay

P/L accommodation and local interfaces to be confirmed and detailed: Ongoing activity, as part of PDR with minor adjustments only H/W phase comes upon us, and requires significant more attention to detailed

work and close interaction and reporting

In view of the above and the observed IPDR results: Please stop “nice-to-have” optimisation dreams Keep momentum and intensify P/L work Adopt the “Yes We Can” attitude – also we got to get out of a crisis !

MPO Payload Priorities


The Critical Equipment Review was held between September-December 2008 Critical technological elements were reviewed Highly useful exercise and confirmed many technologies that are not considered

critical any more Some remained open and were further studied in spring 2009, such as solar

arrays, antenna pointing mechanism and wave guide

The CER board met on 18 December 2008 Recommended to start the PDR activity Recommended that Collocation Meeting should be organized only after the test

results on the solar array are available Gave critical notes on the mass traceability and maturity of technology for solar

array, antenna pointing mechanism and waveguides

Critical Equipment Review - 2008


The PDR Kick-Off was held on 10 March The CER Board provided guidance to the review team and recommendations on work by

the Prime before collocation The SPC Tracking Committee follows the PDR and advises the SPC

Major items were: Overall mass budget with increasing trend remains a major concern (10% margin!) S/W and AOCS complexity and development schedule AIV (accessibility of equipment, schedule) Solar Array Contamination risk by thruster plumes

Collocation meeting with Astrium on 4 – 7 May

The PDR Board meeting on 29 May

PDR Activities and Issues


Preliminary draft recommendations of the PDR board are not yet public

The PDR Board recognized significant development accomplished during the past 12 months The board believes strongly that BepiColombo will fly Solar arrays are adequate for the Mercury environment and are currently tested for

at 200 C for 10 000 hrs at 230 C for 5 000 hrs The results confirmed the expectations of solar cell aging

The PDR Board will reconvene in September to discuss the remaining key issues, such as mass and solar array Final PDR meeting in November is for closing the RIDs and AIs

The BepiColombo CaC needs to be confirmed after the summer in order to issue the SPC paper in September for the SPC meeting on 2 October 2009

PDR Results


Manufacturing of STM is in final stage at JAXA, test preparations on-going

Tests on EM are on-going

On-board S/W requirements review completed

Launcher coupled load analysis confirmed acceptable notching profile

Characterization tests of thermal hardware and solar cells are on-going

Issue: Solar array appears to have too little margin to cover UV degradation, temperature uncertainties and modified cosine law. Addition of one solar cell string is under consideration (MMO height increase of 16 cm)

MMO Status

1 H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009 1 Status of BepiColombo Harri...

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