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BepiColombo MMO Status Update

For HEWG2014, June 2014

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• Mass • small positive margin•Need careful control

• Final AIV• Vibration and Shock test was finished.

MMO status

Final AIV(Before Environmental Test) ＠ ISAS

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• Contamination : Closed• Molecular contamination from MMO :

•No hazardous contaminant will be left on the surface of MMO

• Particulate contamination from MPO HT MLI•Minimized by the separation foil

between MPO and MMO

MMO status

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• Solar Cell Whitening : to be closed• FM Solar cell whitening was found after

thermal cycling (-160℃ ～ 180℃) in vacuum. • Has been regarded as the most critical

item. • Cell whitening was caused by the pealing

of anti-reflector coating from cell.• Cell whitening broadened when the cell is

exposed to the air after testing. In vacuum condition, whitening expands only during first heat-up cycle but not later.

MMO status

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Solar Cell Whitening

Cell whitening observed where the thickness of the glue(DC93-500) is less than 40um

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• Currently degradation of power generation due to the cell whitening is less than 1%. • Worst case analysis shows degradation

of power generation at EOL is 11% which is lower than the budget (17%).

→ Use as is.

Solar cell whitening

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• Final AIV : end at October 2014• 1 axis vibration test : July 2014. • Thermal valance test : August 2014.

• Transportation to ESA/ESTEC : Jan. 2015• MMO stand alone test at ESTEC : Feb.- Mar. 2015• MMO hand over to ESA : End of Apr. 2015• MCS final AIV : May – Dec. 2015• Transportation to CSG : Dec. 2015• Launch Campaign : Jan. – Jun. 2016• MMO stand alone test at CSG : Jan. 2016

• MMO Telemetry data at ESA/ESTEC and CSG will be delivered through MMO data distribution server at ISAS.

Schedule

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MMO Orbit around Mercury

Initial periherm height : 590kmInitial apoherm height : 11,639km

Periherm altitude will decrease with time.with 2 years operation : down to 350km

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MEA low-energy e-

MSA low-energy ion

MIA solar wind ion

HEP-e high energy e-

HEP-i high energy ion

ENA energetic neutral atom

MGF magnetic field

PWI radio/plasma wave/electric field

MDM dust

MSASI atmosphere (& surface)image

Internal magnetic field Structure & Distribution Origin & Internal structure

Magnetosphere Structure, Kinetics, Processes Scaling law Effect of “boundary conditions” no-ionosphere, small-scale, fast-process, & different SW

Atmosphere (Exosphere) Structure, Variation Production from surface Loss to solar wind & magnetosphere

Surface/Crust Present structure & Evolution

Interplanetary Plasma & Dust

Space physics at Mercury

Environment of Mercury

History of Mercury

Reminder: MMO Payloads

MPPE, MGF, PWI, MSASI, MDMMPPE

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Discussion items to be re-vitalized

- Data product / Data base - Inter-referencing between MMO and MPO data

- Science operation / Telemetry & Data Recorder budget management

Apoherm

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Discussion items to be re-vitalized

- Rock-solidify the reason for requesting the 2nd data reception antenna for MMO