Philae oncomet science: remote sensing by CIVA, Rolis, CONSERT

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Title: Philae oncomet science: remote sensing by CIVA, Rolis, CONSERT

1
Philae on-comet science remote
sensing by CIVA, Rolis, CONSERT

Helsinki, September 5, 2006
2
Philae on-comet science remote
sensing by CIVA, Rolis, CONSERT

Context
3. The objective of the proposed exercise is
not to freeze the on-comet operations. We all are
well aware that things may and will evolve
flexibility must be insured to optimize our
operations. However, securing success and
optimizing operations requires to build a
consolidated timeline based on actual figures,
validated and tested, and to identify and work
out the relevant actions.
4. We have anyhow to load a default sequence to
be ran entirely autonomously, in case

Helsinki, September 5, 2006
3
Philae on-comet science remote
sensing by CIVA, Rolis, CONSERT

Issues
1. Given its challenging status, Philae is
marginal in all aspects essentially science
objectives, system, instruments, operations.
Moreover, the change in comet target has
contributed to squeeze all margins, possibly
towards negative values.
2. We plan to use at their completion all
expected resources, which can be viewed as an
optimized plan (although not necessarily an
optimized management).
3. Only a consolidated tested timeline,
assessed at system level, can identify issues to
be worked out. The Philae Project has put in
place means to perform efficiently this exercise,
and to sort out the major issues. Some are of our
own e.g. on board energy instrument modes/data
processing some requires negotiating with the
Rosetta Project e.g. release orbit/visibility
periods.
We must face and solve all issues. Thus todays
discussion.

Helsinki, September 5, 2006
4
Philae on comet science remote
sensing by CIVA, Rolis, CONSERT

CIVA-P stereo panorama just after landing, for
- science characterize the surface properties
- system contribute to landing assessment
- PR
ROLIS zoom imaging of the landing site, for
- science characterize the surface properties
- PR
- system contribute to landing assessment
CONSERT radar sounding, for
- science unique means to sound the interior
of a small body, as a pioneering investigation
of highest value.

Helsinki, September 5, 2006
5
Philae on comet science remote
sensing by CIVA, Rolis, CONSERT

Helsinki, September 5, 2006
6
Philae on comet science remote
sensing by CIVA, Rolis, CONSERT

Issues
1) CIVA ROLIS require operation and uplink
(Orbiter visibility) right following touch-down
for a minimum of 30 min vs 15 min in the
present (Wirtanen-based) plan. Negotiation
required and agreement conceivable (to be
urgently acted).
2) Quick-look data reduction to assess Lander
landed status prior to actuate any mobile on
board system (instrument deployment, Lander
rotation) leaves a 12 hours of operation. This
is an ideal period (resource-wise and
operation-wise) to offer CONSERT performing its
full prime sequence.
3) The proposed option does not entirely
satisfies CONSERT (TBD/TBC), and might not be
compatible with orbit choice satisfying the
visibility constraint (ESOC action).

Helsinki, September 5, 2006
7
Philae on comet science remote
sensing by CIVA, Rolis, CONSERT

Issues
1) CIVA ROLIS require operation and uplink
(Orbiter visibility) right following touch-down
for a minimum of 30 min vs 15 min in the
present (Wirtanen-based) plan. Negotiation
required and agreement conceivable (to be
urgently acted).
2) Quick-look data reduction to assess Lander
landed status prior to actuate any mobile on
board system (instrument deployment, Lander
rotation) leaves a 12 hours of operation. This
is an ideal period (resource-wise and
operation-wise) to offer CONSERT performing its
full prime sequence.
3) The proposed option does not entirely
satisfies CONSERT (TBD/TBC), and might not be
compatible with orbit choice satisfying the
visibility constraint (ESOC action).

Helsinki, September 5, 2006
8
Philae on comet science remote
sensing by CIVA, Rolis, CONSERT

Issues
1) CIVA ROLIS request operation and uplink
(Orbiter visibility) right following touch-down
for a minimum of 30 min vs 15 min in the
present (Wirtanen-based) plan. Negotiation
required and agreement conceivable (to be
urgently acted).
2) Quick-look data reduction to assess Lander
landed status prior to actuate any mobile on
board system (instrument deployment, Lander
rotation) leaves a 12 hours of operation. This
is an ideal period (resource-wise and
operation-wise) to offer CONSERT performing its
full prime sequence.
3) The proposed option does not entirely
satisfies CONSERT (TBD/TBC), and might not be
compatible with a choice of orbit satisfying the
visibility constraint (ESOC action).

Helsinki, September 5, 2006
9
Philae on comet science remote
sensing by CIVA, Rolis, CONSERT

Possible alternatives
1) CIVA ROLIS acquire their data as presently
planned, but the uplink is in part postponed to a
later visibility period.
Concerns
- requires maintaining ROLIS IME ON (tens of Wh
more)
- postpones downlink to Earth means to assess
landing
- PR
2) CIVA acquisition is postponed to the second
visibility period, to minimize energy (ROLIS off
after first uplink).
Concerns
- postpones downlink to Earth means to assess
landing
- PR

Helsinki, September 5, 2006
10
Philae on comet science remote
sensing by CIVA, Rolis, CONSERT

Helsinki, September 5, 2006

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