Status of BepiColombo Harri Laakso ESA/ESTEC, Code SRE-OS, Noordwijk, The Netherlands
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Transcript of Status of BepiColombo Harri Laakso ESA/ESTEC, Code SRE-OS, Noordwijk, The Netherlands
1H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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Status of BepiColombo
Harri LaaksoESA/ESTEC, Code SRE-OS, Noordwijk, The Netherlands
H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
2H. 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
3H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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 NO NO(PA) NO YES NO NO NO
(YES) NO
Summary of IPDR Results
4H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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
5H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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 controlMERMAG 5 4.6 5 -MERTIS 8 13 12 re-allocation TBDMIXS 12 16 14 value is for full mode MGNS 4 4.5 4.5 -MORE 30 37 37 only for orbits with GS contactPHEBUS 4 3.8 4 orbital average, full mode 23 WSERENA 21 22 22 22.4 W for full science modeSIMBIO-
SYS23 25 25 32.5 W for full science mode
SIXS 2 2.5 2.5 -TOTAL 164 139/17
6142/179 operations may be seasonally
constraintOperational scenarios under study by SOC; re-allocation pending further assessmentLimitation to 100 W baseline for perihelion or certain mission phases
6H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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
7H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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
8H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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
9H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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
10H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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
11H. Laakso, SERENA - HEWG meeting, Mykonos, Greece, 8-11 June 2009
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