1. ROSETTA SWT 27th ESOC, 2-4 December 2009
Plenary meeting WG-2 & WG-3
2 December, 2009

2. WG2 status and upcoming since SWT26
Common/complementary measurement tables : Released soon
Analytical table : Released soon
Science Theme Table:
cleaning and restructuration of STT nearly done (Tra-Mi Ho/PIs)
Rosetta Science Themes Definition (document by C. Vallat) : Science Objectives and Detailed Science Objectives
Issue raised (ROSINA) : How to avoid unintentional prioritization of instruments represented by multiple lines in single Science Objectives in STT? => to be discussed during SWT27
Test case : interactions of PIs with RSOC
First version of Master Science Plan for WG2 testcase submitted by RSOC to PIs (Nov 26th, 2009)
AIs Mission Scenarios based on the list proposed during SWT26 by WG2 chairs

3. Agenda
WG2 Test Case
Discussion on issues raised by PIs/WG3 chair
Gas production constraints
Discussion on trajectory boundary conditions proposed by RSOC
Science Mission Scenarios (SMScs) for chemical studies
Issues raised by WG3 chair/SWT members
Discussion on SMScs proposed by WG2 chairs
How to merge WG2 SMScs with WG3?

4. WG2 Test Case Status
The first mission scenario(s) to be studied to consolidate the strategy for the baseline plan
Test Case / new definition : linked to the selected mission phase 3 to 2.6 AU (i.e. distant phase)
WG-2 and WG-3: Test case with different science objectives (chemical versus physical properties)
WG-2 : Call for participating to the Test case (end of March 2009)
Next :
PIs to provide detailed information on their observations for the Test Case
RSOC will provide a requirement document
( form to be filled only for the Test case)
Alternatively RSOC directly in contact with PIs for requesting missing information.

5. WG2 Test case « Investigating gas (H2O, CO and CO2) and dust composition at the beginning of the ESCORT phase (day and night side), i.e. at 3 AU from the Sun »  Science themes and sub-themes :2-D, 4-A, 4-B, 4-C, 5-A, 5-B, 5-C, 6-A
Constraints provided :
Q(H2O) = mol/s
Q(CO) = Q(CO2) = to 1027 mol/s
Dust model from WG3 leading to Q(dust) = 60 kg/s
Form to be filled in provided
9 answers received, 5 priority instruments :
Alice, Rosina, Osiris, Miro, Virtis, Cosima, Giada (?), RPC-Mag, RPC-IES
First version of Master Science Plan for WG2 testcase submitted by RSOC to PIs (C. Vallat, Nov 26th, 2009)

6. Test case : Science objectives / measurements**
ALICE (AL) : Measurement of CO abundance in coma; mapping CO distribution relative to H2O in coma; relating CO distribution to surface features.
measurements : CO Fourth positive Band emission in the Far UV
COSIMA (CS) : Composition of cometary grains in the early comet activity phase
measurements : Dust grain collection, dust images, ion mass spectra
GIADA (GD) : Characterisation of dust properties in the coma and on the nucleus
measurements : Dust flux, fluence, mass distribution, speed
RPC-IES : Solar Wind measurements, ion pickup, photo-electrons (important for UV meas., sputtering)
measurements : Ion and electron fluxes
RPC-MAG : Solar Wind measurements
measurements : Magnetic field
OSIRIS (SR) :
1) Change in limb activity,
2) Gas and dust production rates,
3) Characterization of the orbit of large grains
4) Characterization of icy grains
measurements : dust/OH production rates, grain imaging with different color filters
ROSINA (RN): Gas density and velocity, H2O, CO, CO2 … etc local densities
measurements : mass spectra, pressure/velocity
MIRO (MR): H2O, CO outgassing rates, asymmetries in the coma, gas velocity, O isotopic ratios, nucleus temperature versus gas production
measurements : water and CO spectra, nucleus temperature via continuum measurements
VIRTIS (VR): gas production (H2O, CO, CO2) from limb sounding
measurements : spectra of H2O, CO, CO2 bands at various limbs (sunrise and sunset)
Comment : context data useful
(surface, limb)

7. Missions scenarios Definition of one mission scenario :
Complete validated scientific observation plan that covers (partially or completely) a specific set of science objectives.
A set of observations with a dedicated trajectory, a pointing / slewing profile, an operations and communication plan.
Has a finite duration with a start and end time.
The set of observations selected will have compatible trajectory requirement and cover prioritized science objectives.
Rules : A scenario can have a variable duration. Scenarios cannot overlap. Scenarios are identified in the baseline plan.
A Science Mission scenario is developed based on Selected Science Priorities.
Prioritization of the instruments :
1) weight of scientific value.
2) scarcity of opportunities, urgency of completion due to dependency of subsequent observations of higher priority etc.
Prioritization is complex and dynamic. The depth of prioritization levels should not be excessive.
From team requests RSOC proposes an optimal trajectory which defines the Planning Mission Scenario
Requests not fulfilled will be scheduled in another planning mission Scenario
Slots might be available for observations with other objectives

8. Mission scenarios
To go forward for the Long Term strategy, WG-2 and WG-3 should establish a list of Science Scenarios
Scenarios with similar science objectives are required
different S/C attitude/distance requested by teams
changing activity of the comet
Scenarios may fulfill both chemically-related / physically related science objectives (i.e., there are instrument observations which provide both physical and chemical quantities)
Some Science Objectives require coordinated measurements of physical and chemical quantities
Overlap between Mission Scenarios investigated within WG-2 and WG-3
Coordination between WG-2 and WG-3 to be required at some step
A list of 31 possible WG-2 Mission Scenarios has been established by WG-2 chairwomen

9. 31 SMScs proposed so far
Which scenarios are missing/redundant/irrelevant ?
Are all scientific objectives covered by Mission Scenarios ?
Which complementary measurements (physical parameters) are essential ?
Mission phases for each scenario
Priority instruments for each scenario
Which are the S/C distance, viewing angles, and pointing requirements (and suggested orbit type) ?
Inputs received from:
ALICE, GIADA, RPC, ROSINA, MIDAS, COSIMA, CONSERT, MIRO (partial input for most of them except for GIADA)
MASTER Scenarios ? (needs interaction w/ WG3)
Identify key SMScs (WG2&3) aimed at the main objectives of the ROSETTA mission
Future AI : merging SMScs scenarios with WG3 : (e.g. outbursts, trajectory boundary conditions…)

10. Extracted from SMScs (Nucleus)

11. Extracted from SMScs (Coma/Tail – 1/2)

12. Extracted from SMScs (Coma/Tail – 2/2)

13. Extracted from SMScs (Special Pointing)

14. Science Mission Scenarios – Issues raised
E. Gruen (Chair WG3) & SWT members :
There is reluctance by the investigator teams to put much effort in defining the very many different possible scenarios that may be applicable during the cruise.
oversight team w/ representatives of the various involved groups to help the development and review the operation planning process ?
Give Rosetta science operations some structure by defining "operation categories"?
RSOC/ESAC will propose a framework for the future activities of the Working Groups for operation planning