49
24-08-2004 2nd International Planetary Probe Workshop 1 The Huygens Mission to Titan: Overview and status Jean-Pierre Lebreton, Huygens Mission Manager & Project Scientist Research and Scientific Support Department of ESA, ESTEC, Noordwijk, The Netherlands [email protected] Dennis Matson, Cassini Project Scientist Cassini Project, Jet Propulsion Laboratory, Pasadena, USA

jean-pierre.lebreton@esa - ntrs.nasa.gov

  • Upload
    others

  • View
    1

  • Download
    0

Embed Size (px)

Citation preview

Page 1: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p1

The

Huy

gens

Mis

sion

to T

itan:

Ove

rvie

w a

nd st

atus

Jean

-Pie

rre

Lebr

eton

, Huy

gens

Mis

sion

Man

ager

& P

roje

ct S

cien

tist

Res

earc

h an

d Sc

ient

ific

Supp

ort D

epar

tmen

t of E

SA, E

STEC

, Noo

rdw

ijk, T

he N

ethe

rland

sje

an-p

ierr

e.le

bret

on@

esa.

int

Den

nis M

atso

n, C

assi

niPr

ojec

t Sci

entis

tC

assi

niPr

ojec

t, Je

t Pro

puls

ion

Labo

rato

ry, P

asad

ena,

USA

Page 2: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p2

Cas

sini

-Huy

gens

A 3

-age

ncy

Inte

rnat

iona

l Mis

sion

NA

SA, E

SA, A

SI19

coun

tries

invo

lved

Page 3: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p3

Page 4: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p4

Pola

r Vie

wPo

lar V

iew

Equa

toria

l Vie

wEq

uato

rial V

iew

Page 5: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p5

Page 6: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p6

Oct

ober

15,

199

7O

ctob

er 1

5, 1

997

Laun

ched

from

K.S

.C.

Laun

ched

from

K.S

.C.

Page 7: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p7

Page 8: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p8

Page 9: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p9

Cas

sini

ISS

Page 10: jean-pierre.lebreton@esa - ntrs.nasa.gov

Surf

ace

Ice

Org

anic

s ?

Cas

sini

VIM

S

Page 11: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p11

Cas

sini

VIM

S

Page 12: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p12

Cas

sini

VIM

S

Page 13: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p13

Cas

sini

ISS

Page 14: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p14

Atm

osph

ere

de T

itan

Page 15: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p15

Page 16: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p16

Go-

NoG

oFo

rPr

imar

y M

issi

on2

Dec

.

Go-

NoG

oFo

rSe

para

tion

23 D

ec.

Page 17: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p17

The

New

(and

Old

) Huy

gens

M

issi

on65

000

Km

7600

0 Km

Old

Pro

be/O

rbite

r Tra

ject

ory

Fly-

By A

lt =

1200

Km

BOM

Dis

t = 7

7000

Km

EOM

Dis

t = 2

7000

Km

PAA ≈

40o

V rel≈

5.6

Km/s

New

Orb

iter

Traj

ecto

ry

V rel≈

0.8

Km

/s

PAA ≈

75o

V rel≈

3.8

Km

/s

PAA ≈

25o

Tita

n

Cas

sini

@

Pro

be E

ntry

Cas

sini

@

Prob

e To

uch-

dow

n

Cas

sini

@

Pro

be E

ntry

Cas

sini

@ P

robe

To

uch-

dow

n

Old

Pro

be

Traj

ecto

ry

New

Pro

be

Traj

ecto

ry

Page 18: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p18

Inte

rface

Allt

itude

1270

km

Pro

be w

ake-

up b

y pr

ogra

mm

ed ti

mer

4 hr

28

min

bef

ore

arriv

alat

pre

dict

ed in

terfa

ce a

ltitu

de

CD

MU

’spr

e-he

atin

g

Bas

elin

e sc

enar

io: P

re-h

eatin

g

Inte

rface

Allt

itude

1270

km

Pro

be w

ake-

up b

y pr

ogra

mm

ed ti

mer

28 m

in b

efor

e ar

rival

at p

redi

cted

inte

rface

alti

tude

GC

MS

pre

-hea

tH

AS

I ON

, Stb

yG

CM

S p

re-h

eat

HA

SI M

eas.

GC

MS

pre

-hea

tH

AS

I ON

, Mea

s

Bac

k-up

sce

nario

: No

pre-

heat

ing

Tim

e

Tim

e

Page 19: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p19

Page 20: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p20

Entry

and

Des

cent

Sce

nario

: 14

Jan-

2005

Page 21: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p21

The

Huy

gens

Sci

ence

Pay

load

Page 22: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p22

Huy

gens

Pay

load Su

rfac

e st

ate

and

com

posi

tion

at la

ndin

g si

te.

Atm

osph

eric

mea

sure

men

tsSu

rfac

e Sc

ienc

e pa

ckag

e (S

SP)

J. Za

rnec

ki (O

pen

Uni

v.)

Zona

l win

d pr

ofile

, tur

bule

nce

Dop

pler

Win

d Ex

perim

ent (

DW

E)M

. Bird

(U o

f Bon

n)

Hea

t flu

x, e

nerg

y bu

dget

, clo

uds,

aero

sols

pr

oper

ties,

surf

ace

imag

ing

& c

ompo

sitio

nD

esce

nt Im

ager

/Spe

ctra

l Rad

iom

eter

(DIS

R)

M. T

omas

ko (U

of A

rizon

a)

Aer

osol

sam

plin

g in

two

laye

rs. S

tepp

ed

pyro

lysi

s(0

C, 2

00 C

, 650

C);

inje

ctio

n to

G

CM

S

Aer

osol

Col

lect

or a

nd P

yrol

yzer

(AC

P)G

. Isr

ael (

CN

RS/

SA V

errie

res)

Atm

osph

ere

com

posi

tion;

trac

e co

nstit

uent

s;

isot

opic

ratio

s; a

eros

ol a

naly

sis

Gas

Chr

omat

ogra

ph/M

ass S

pect

rom

eter

(G

CM

S),

H. N

iem

ann

(NA

SA/G

SFC

)

T, P

, γ, W

inds

, Tur

bule

nce,

Con

duct

ivity

; lig

htni

ng; s

urfa

ce p

erm

ittiv

ity &

rada

r re

flect

ivity

Huy

gens

Atm

osph

eric

Stru

ctur

e In

stru

men

t (H

ASI

). M

. Ful

chig

noni

(Par

is 7

/Obs

Meu

don)

Page 23: jean-pierre.lebreton@esa - ntrs.nasa.gov

23

Huy

gens

Pay

load

& G

roun

d-ba

sed

Rad

io S

igna

l Det

ectio

n

Prob

e lo

calis

atio

nto

~ k

m a

cc. i

n x-

ypl

ane;

2D w

ind

mea

sure

men

tsV

LBI P

robe

sign

al c

arrie

r det

ectio

n G

roun

d-ba

sed

DW

E

Surf

ace

stat

e an

d co

mpo

sitio

n at

land

ing

site

.A

tmos

pher

ic m

easu

rem

ents

Surf

ace

Scie

nce

pack

age

(SSP

)J.

Zarn

ecki

(Ope

n U

niv.

)

Zona

l win

d pr

ofile

, tur

bule

nce

Dop

pler

Win

d Ex

perim

ent (

DW

E)M

. Bird

(U o

f Bon

n)

Hea

t flu

x, e

nerg

y bu

dget

, clo

uds,

aero

sols

pr

oper

ties,

surf

ace

imag

ing

& c

ompo

sitio

nD

esce

nt Im

ager

/Spe

ctra

l Rad

iom

eter

(DIS

R)M

. To

mas

ko (U

of A

rizon

a)

Aer

osol

sam

plin

g in

two

laye

rs. S

tepp

ed

pyro

lysi

s(0

C, 2

00 C

, 650

C);

inje

ctio

n to

G

CM

S

Aer

osol

Col

lect

or a

nd P

yrol

yzer

(AC

P)G

. Isr

ael (

CN

RS/

SA V

errie

res)

Atm

osph

ere

com

posi

tion;

trac

e co

nstit

uent

s;

isot

opic

ratio

s; a

eros

ol a

naly

sis

Gas

Chr

omat

ogra

ph/M

ass S

pect

rom

eter

(G

CM

S),

H. N

iem

ann

(NA

SA/G

SFC

)

T, P

, γ, W

inds

, Tur

bule

nce,

Con

duct

ivity

; lig

htni

ng; s

urfa

ce p

erm

ittiv

ity &

rada

r re

flect

ivity

Huy

gens

Atm

osph

eric

Stru

ctur

e In

stru

men

t (H

ASI

). M

. Ful

chig

noni

(Par

is 7

/Obs

Meu

don)

Page 24: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p24

Page 25: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p25

Page 26: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p26

Engi

neer

ing

Stat

us; O

n-go

ing

activ

ities

Page 27: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p27

TIT

AN

Atm

osph

ere

envi

ronm

ent

•A

tmos

pher

e D

ensi

ty, P

ress

ure

and

Tem

pera

ture

mod

els

avai

labl

e:–

Des

ign

mod

el: L

ello

uch-

Hun

ten

(rec

, min

, max

, 198

6)–

Upd

ated

mod

el: Y

elle

(rec,

min

, max

, 199

4)•

Gra

vity

Wav

es:

–D

. Stro

belM

odel

(sin

gle

phas

e la

rge

ampl

itude

pro

files

, 199

4)–

Ana

lytic

al M

odel

(J.P

. Leb

reto

n, 2

004)

•W

ind

Mod

el: s

o-ca

lled

HR

TF (F

lasa

rmod

el)

•Ti

tan

GR

AM

(dis

turb

ance

s on

Yel

lepr

ofile

s -d

evel

oped

fo

r aer

ocap

ture

stud

ies

and

used

as

is)

Page 28: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p28

Lello

uch-

Hun

ten

Mod

el

Thre

e m

ain

com

pone

nts a

re N

itrog

en (N

2), M

etha

ne (C

H4)

, and

Arg

on (A

r).

0.5%

< X

CH

4/X N

2< 3

.5 %

; Rel

ativ

e m

olar

abu

ndan

ce o

f Arg

on :

0 <

X A

r/X N

2<

27%

.

Page 29: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p29

Yel

leM

odel

Page 30: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p30

Yel

leM

odel

Min

Nom

M

axN

2

95%

95%

89%

CH

45%

3%1%

Ar

0%2%

10%

Page 31: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p31

Entry

Alti

tude

Ran

ge

Page 32: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p32

Tem

pera

ture

(K)

Page 33: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p33

Page 34: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p34

Page 35: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p35

On-

goin

g ac

tiviti

es•

Re-

valid

atio

n of

ent

ry a

nd d

esce

nt p

erfo

rman

ce–

Hea

t flu

x re

cent

ly re

-ass

esse

d: 1

400

2000

kW

/m2

–TP

S an

d ov

eral

l Sys

tem

per

form

ance

und

er ~

200

0 kW

/m2

–H

eat-f

lux

re-e

valu

atio

n (E

STEC

, EM

2C, N

ASA

/AM

ES, E

AD

S,

Alc

atel

)–

Hea

t shi

eld

tile

trans

pare

ncy

test

s to

CN

vio

let r

adia

tion

–Pa

rach

ute

depl

oym

ent l

oads

–En

try a

ngle

con

firm

atio

n (b

asel

ine

-65

º±3°

)•

Val

idat

ion

of a

tmos

pher

e m

odel

–T0

(3rd

July

) Cas

sini

orbi

ter o

bser

vatio

n–

Rel

evan

t gro

und

base

d ob

serv

atio

ns (e

. g. o

ccul

tatio

n of

Nov

. 200

3)–

Plan

ned

Ta C

assi

niO

rbite

r obs

erva

tions

(26

Oct

ober

200

4)–

Plan

ned

Tb C

assi

niO

rbite

r obs

erva

tion

(13

Dec

. 200

4)

Page 36: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p36

On-

goin

g ac

tiviti

es (2

)•

Huy

gens

des

igne

d fo

r (cu

mul

ated

) wor

st c

ase

cond

ition

s–

Atm

osph

ere

Mod

el C

ompo

sitio

n–

Gra

vity

wav

es–

Failu

re c

ases

•M

onte

-Car

lo st

udy

base

d on

Tita

nGR

AM

•M

issi

on b

asel

ine

re-v

alid

atio

n an

d m

argi

ns to

be

clar

ified

by

early

Oct

ober

•N

ASA

/ESA

Rev

iew

in p

lann

ing

(Sep

t/Oct

?-N

ov)

Page 37: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p37

Huy

gens

key

ope

ratio

nal m

ilest

ones

•T0

: 3 Ju

ly; T

0 w

orks

hop:

8/9

Sep

t. at

NA

SA/G

SFC

•Ti

tan

atm

osph

ere

mod

els v

alid

atio

n/up

date

#1: 3

0 Se

pt.

•PC

O#1

5: 1

4thSe

ptem

ber;

batte

ry d

epas

siva

tion#

1•

Ta: 2

6 O

ctob

er; T

a W

orks

hop:

15

Nov

at J

PL•

Tita

n at

mos

pher

e m

odel

s val

idat

ion/

upda

te#2

: 25

Nov

.•

PCO

#16:

23

Nov

embe

r; ba

ttery

dep

assi

vatio

n#2

•G

O/N

OG

O fo

r prim

ary

mis

sion

: 2 D

ec.

•Tb

: 13

Dec

; Tita

n at

mos

pher

e re

port:

15

Dec

.•

PTM

: App

rova

l: 15

Dec

; Exe

cutio

n 17

Dec

.•

Prob

e pr

e-se

para

tion

con

figur

atio

n: 2

1 D

ec•

GO

/NO

GO

for P

robe

sepa

ratio

n: 2

3 D

ec.

•Pr

obe

Rel

ease

: 25

Dec

.•

Prob

e En

try: 1

4 Ja

nuar

y 09

:07

UTC

Page 38: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p38

Wha

t Hap

pens

Nex

tre

. atm

osph

ere

valid

atio

n ?

RRep

lace

with

INM

S da

ta, T

A

CIR

S C

onst

rain

ts, T

0

Page 39: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p39

Wha

t Hap

pens

Nex

tre

. atm

osph

ere

valid

atio

n ?

RRep

lace

with

INM

S da

ta, T

A

CIR

S C

onst

rain

ts, T

0

Page 40: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p40

Con

clus

ions

•Pr

obe/

Orb

iter s

yner

gy a

ppro

ach

to e

xplo

re T

itan

•Ti

tan

atm

osph

ere

seem

s to

be w

ell w

ithin

Yel

leen

velo

pe•

Som

e H

uyge

ns o

pen

issu

es in

wor

k; c

losu

re e

xpec

ted

by e

arly

O

ctob

er. P

ossi

ble

outc

ome:

–B

asel

ine

mis

sion

con

firm

ed; t

arge

t for

ent

ry a

t -65

º±

3°–

Adj

ust e

ntry

ang

le (-

64 º

±3°

) or (

-66

º±3°

)–

Del

ayed

rele

ased

on

Tc( b

y up

to 1

0 da

ys ?

) al

low

s to

redu

ce e

ntry

co

rrid

or b

ut ri

sks ;

ben

efits

not

qua

ntifi

ed•

Two

cont

inge

ncy

scen

ario

s ide

ntifi

ed w

ith p

robe

rele

ase

on

late

r orb

it: O

vera

ll m

issi

on im

pact

s are

hig

h•

Look

forw

ard

to P

WS#

3 !!

Page 41: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p41

•Bac

k-up

mat

eria

l

Page 42: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p42

100

m/s

2<P

eak

valu

e <

162

(185

) m/s

217

0 se

c <

Pea

k tim

e <

230

sec

Pea

k al

titud

e ra

nge:

200

-280

km

Page 43: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p43

S0

enab

ling

50 m

/s2

100

m/s

2<P

eak

valu

e <

162

(185

) m/s

217

0 se

c <

Pea

k tim

e <

230

sec

Pea

k al

titud

e ra

nge:

200

-280

km

Page 44: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p44

S0

enab

ling

50 m

/s2

Ta e

nabl

ing

80 m

/s2

100

m/s

2<P

eak

valu

e <

162

(185

) m/s

217

0 se

c <

Pea

k tim

e <

230

sec

Pea

k al

titud

e ra

nge:

200

-280

km

Page 45: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p45

S0

enab

ling

50 m

/s2

Ta e

nabl

ing

80 m

/s2

S0

dete

ctio

n10

m/s

2

100

m/s

2<P

eak

valu

e <

162

(185

) m/s

217

0 se

c <

Pea

k tim

e <

230

sec

Pea

k al

titud

e ra

nge:

200

-280

km

Page 46: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p46

S0

enab

ling

50 m

/s2

Ta e

nabl

ing

80 m

/s2

S0

dete

ctio

n10

m/s

2

S0

dete

ctio

n: 1

0 m

/s2

Ta d

etec

tion:

9.4

84 m

/s2

T0 d

ecla

red

6.37

5 se

c

Page 47: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p47

S0

enab

ling

50 m

/s2

Ta e

nabl

ing

80 m

/s2

S0

dete

ctio

n10

m/s

2

S0

dete

ctio

n: 1

0 m

/s2

Ta d

etec

tion

(SW

Fai

lure

)

T0 d

ecla

red

6.37

5 se

c

Sin

gle

failu

re c

ase

Page 48: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p48

Ta b

ack-

up e

nabl

ing

62 m

/s2

and

54 m

/s2

Ta b

ack-

up d

ecla

red

S0

Bac

k-up

T0 b

ack-

up

20 s

ec

6.37

5 s

Mul

tiple

failu

re (C

AS

U’s

)

G-s

witc

h ac

tivat

ion

T0 N

om

Ta b

ack-

upde

clar

ed25

m/s

2 an

d 12

m/s

2

Page 49: jean-pierre.lebreton@esa - ntrs.nasa.gov

24-0

8-20

042n

d In

tern

atio

nal P

lane

tary

Pro

be

Wor

ksho

p49

Zona

l win

d ef

fect

s