philae science team, venice 20091 philae on-comet science objectives prepared by hbo document name =...

PHILAE Science Team, Venice 2009 1

Philae On-Comet Science Objectivesprepared by HBO

Document name = Scientific Objectives of the PHILAE Mission (RO-LAN-LI-1000), 6+12+28+33+1 tasks, 100 pages

Document contains the experimenter’s objectives & wish list it might not be possible to implement (operations) and

to accomplish (experiments) all tasks

Doc issue 1.0 released to ESA & PHILAE team by late Aug. 2008 lander objectives are considered in ESA’s planning of the

ROSETTA science phase as a whole

ESA has started science planning exercise through WGs science scenario approach



Issue 1.0 is incomplete and needs improvement for version 1.1- some experiments have provided incomplete information of which only

some details are indeed not known at the moment- most missing information: task priority, scenario descriptions, repetition

cycles- experimenters focused on their respective instrument objectives

- scenario approach with parallel/complementary measurements by other instruments (both onboard the lander and the orbiter)

- for revision 2 new entry fields to be filled in- Expected Direct Measurement Result: The physical quantities that are obtained

as immediate outcome of the experiment (without involving physical models). Usage of experiment models for characterizing the instrument are allowed. The expected physical units of the results should be listed as well.

- Expected Results Through Modeling: The physical quantities that are obtained as indirect outcome of the experiment, now using physical models. Please identify the physical model or at least the type of physical model to be used and provide physical units of the results.



Return upon call for input for the revised document version 1.1 was insufficient

positive: SD2, MUPUS, ROMAP, SESAME, COSAC, ROLIS

nothing: APXS, CIVA, CONSERT, PTOLEMY Proposal on how to proceed towards a rather complete

document with science priorities that are useful for planning purposes

PI teams: provide input as complete as possible Easter 2009 LS compile version 1.1 and distribute it to PI teams 1 week thereafter meeting of PIs and LSes with the task

each PI: presentation of the respective science objectives all: discussion of science issues and pros & cons PIs: ranking of tasks per phase result: priority according to averaged ranking result


ICEP-001, ICEP-002, ICEP-003

SDL-002, SDL-003, SDL-004

FSS-008, LTS-004

SDL-001

SDL-002

ICEP-001, ICEP-002, SDL-001,, FSS-001, FSS-001, FSS-002

LTS-001, LTS-002, LTS-003

FSS-004

LTS-001FSS-001

FSS-001

LTS-001

Interrelation with orbiter measure-ments

O9

FSS-008, LTS-001

LTS-002, LTS-003

LTS-004, LTS-005

LTS-007

FSS-004

FSS-005

LTS-001

LTS-004

FSS-001

LTS-001

Long-term evolution of landing site properties

O8

SDL-001, SDL-003, FSS-001

FSS-005, LTS-001

LTS-006, LTS-007

SDL-001, FSS-003, FSS-004

FSS-005, LTS-001, LTS-003

LTS-004

Thermal & mechanical properties & mass transport

O7

ICEP-001, ICEP-002, ICEP-003, ICEP-004, SDL-002, SDL-004

FSS-004, FSS-007

FSS-008, LTS-004

LTS-005, LTS-008

ICEP-002

FSS-001

LTS-001

Dynamic processesO6

ICEP-004

SDL-004

FSS-007

LTS-008

FSS-001

LTS-001

Comet – plasma interaction

O5

SDL-001

SDL-001, FSS-001, FSS-002

LTS-001, LTS-002, LTS-004

Nucleus interiorO4

SDL-001, FSS-001

FSS-002, FSS-003

FSS-003, FSS-006

LTS-001, LTS-002

LTS-003, LTS-007

LTS-001

SDL-001

SDL-002

FSS-001

LTS-001

LTS-002

SDL-001, SDL-0002, FSS-001

FSS-002, FSS-004, LTS-001

LTS-002

FSS-003

LTS-003

Surface structure & physical properties

O3

FSS-006

LTS-007

FSS-001

FSS-002

LTS-002

LTS-003

LTS-004

FSS-003

LTS-003

SDL-001, FSS-001, FSS-002

FSS-003, LTS-001, LTS-002

LTS-003, LTS-004

FSS-001

LTS-001

Surface & sub-surface composition

O2

FSS-001, FSS-002, LTS-002

LTS-003, LTS-004

SDL-001, FSS-001, FSS-002

LTS-001, LTS-002, LTS-004

LTS-005Nucleus structure & composition

O1

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A

M

E

S

D

2

R

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MA

P

R

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L

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S

P

T

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MY

M

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P

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C

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A

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A

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P

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PHILAE Science Objectives


Rosetta WG3 prepared by HBO

• Gas environment at cometary surface and along orbital path:capabilities: gas production, gas flux, gas density for chemical speciesaccuracy (min,mean,max): 20/50/100% of actual regime at the surfaceresolution: spatial 0.5m at the surface, 10min timewise; typically every

0.01AU from the Sun along the orbitpurpose: instrument and mission planning

• Dust environment at cometary surface and along orbital path:capabilities: dust production, dust flux, dust spatial density, dust size

distribution, dust speedaccuracy (min,mean,max): 20/50/100% of actual regime at the surfaceresolution: spatial 0.5m at the surface, 10min timewise; typically every

0.01AU from the Sun along the orbitpurpose: instrument and mission planning


Thermal environment at cometary surface and along orbital path:

capabilities: nucleus temperature at different depth (0-40cm, each 5cm)

accuracy (min,mean,max): 5/10/20C

resolution: spatial 0.5m at the surface, 10min timewise; typically every 0.01AU from the Sun along the orbit

purpose: instrument and mission planning Plasma and magnetic environment at cometary surface and

along orbital path:capabilities: for ions and electrons plasma density, plasma flux, plasma

temperature, ion composition; magnetic field strength and orientation

accuracy (min,mean,max): 20/50/100 of actual regime at the surface


purpose: instrument and mission planning



Light scattering environment at cometary surface and along orbital path:capabilities: 3D surface model with albedo and light scattering properties,

dust production, dust size distribution, dust light scattering



purpose: instrument and mission planning Dust, gas and temperature environment at cometary

surface and along orbital path:capabilities: dust density, dust flux, local gravity field, gas density, gas flux,

gas composition, gas temperature, surface temperature of cometary environment at landing site



purpose: hazard avoidance



Do we have models to contribute?


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