1. Philae status 21st Rosetta Science Team meeting
1. System Status
2. Instruments status
3. Criticalities
4. Upcoming activities
5. 2nd Philae Science team major outcomes
6. Comet modeling activities and requirements
ESOC, September 14, 2006

2. Philae status 21st Rosetta Science Team meeting
1. System Status
- good global health demonstrated through all PCs
- (minor) concerns:
- discharge rate of the secondary batteries
- ADS tank content
- CDMS remaining anomalies
- thermal gradients during hibernation
ESOC, September 14, 2006

3. Philae status 21st Rosetta Science Team meeting
2. Instrument Status
- nominal performances of the 10 instruments
- no science loss/reduced performance identified
- minor concerns:
- oven heating
- pressure gauge
- uploads/checks during PC4
- for almost all instruments, it will (should) be the finalized uploads
ESOC, September 14, 2006

4. Philae status 21st Rosetta Science Team meeting
3. Criticalities
- on board energy: still a severe constraint
ESOC, September 14, 2006

5. Philae expected onboard energy after release
Present minimal first sequence (60h) requires > 1500 Wh (surface and “deep” sample)
Energy available for potential partial redo (next 60 h) is very limited !

6. Philae status 21st Rosetta Science Team meeting
3. Criticalities
- on board energy: still a severe constraint: → on board tests, and optimization of operations
ESOC, September 14, 2006

7. Philae status 21st Rosetta Science Team meeting
3. Criticalities
- on board energy: still a severe constraint
- telemetry budget: marginal in the old framework
ESOC, September 14, 2006

8. Presently agreed (Wirtanen case) Orbiter - Lander uplink windows
downlink period
duration (mn)
uplinked science data volume (Mbits)
just before landing 15 9
just after landing
next 24 hours
180
110
each following 16 hours 30 18
total (descent + 5 days)
390
235
each following 60 hours 65
By no means we can analyze more than one sample (with the suite of instruments CIVA + PTOLEMY + COSAC), which is not compliant with Philae mission success criterion, which requires 2 samples: surface and “deep”

9. Presently agreed (Wirtanen case) Orbiter - Lander uplink windows
downlink period
duration (mn)
uplinked data (Mbits)
just before landing 15 9
just after landing
next 24 hours
180
110
each following 16 hours 30 18
total (descent + 5 days)
390
235
each following 60 hours 65
The data required to assess the landing status and enable further operations require a minimum of 30 mn visibility period.

10. Philae status 21st Rosetta Science Team meeting
3. Criticalities
- on board energy: still a severe constraint: → on board tests, and optimization of operations
- telemetry budget: marginal in the old framework:
→ critical need to improve the visibility passes
(coupled to the overall release strategy).
ESOC, September 14, 2006

11. Philae status 21st Rosetta Science Team meeting
3. Criticalities
- on board energy: still a severe constraint: → on board tests, and optimization of operations
- telemetry budget: marginal in the old framework:
→ critical need to improve the visibility passes
- release strategy: still a very serious concern (following comet change)
ESOC, September 14, 2006

12. Philae status 21st Rosetta Science Team meeting
3. Criticalities
- on board energy: still a severe constraint: → on board tests, and optimization of operations
- telemetry budget: marginal in the old framework:
→ critical need to improve the visibility passes
- release strategy: still a very serious concern:
→ safe landing requires low altitude release (impact velocity), which in turn requires an accurate knowledge of global nucleus parameters and the modeling of the comet surface and environment.
ESOC, September 14, 2006

13. Philae status 21st Rosetta Science Team meeting
3. Criticalities
- on board energy: still a severe constraint: → on board tests, and optimization of operations
- telemetry budget: marginal in the old framework:
→ critical need to improve the visibility passes
- release strategy: still a very serious concern:
→ critical need for coordinated actions. → Philae specifically requests urgent actions:
- with ESOC: release strategy
- with Orbiter PIs: pre-mapping phase operations
ESOC, September 14, 2006

14. Philae status 21st Rosetta Science Team meeting
4. Upcoming activities
- PC4
- Mars Swingby
ESOC, September 14, 2006

15. Philae status 21st Rosetta Science Team meeting
4. Upcoming activities
- PC4
- Mars Swingby: major opportunity to
- test autonomous operations
- cross-calibrate instruments: ROMAP & CIVA with:
- Rosetta Orbiter instruments
- other mission (MGS, MRO) instruments
ESOC, September 14, 2006

16. Mars FlyBy: CIVA science & operations
- planned around closest distance (250 km)
→ IFOV = 300 m
→ FOV ~ 250 km
- Mars will cross one FOV (camera 1) in ~ 10 mn.
- 6 images are planned for Mars, one every 80 s:
80 s
80 s
80 s
80 s
80 s
Helsinki, September 4, 2006

17. Mars swing-by simulation, by Régis Bertrand (CNES)

18. CIVA-P camera 1 image 1
1400 km : 1.5 km/px

19. CIVA-P camera 1 image 2
1100 km : 1.2 km/px

20. CIVA-P camera 1 image 3
600 km : 700 m/px

21. CIVA-P camera 1 image 4
460 km : 500 m/px

22. CIVA-P camera 1 image 5
260 km : 300 m/px

23. CIVA-P camera 1 image 6
380 km : 400 m/px

24. Mars FlyBy: CIVA proposed timeline
closest approach
“altitude”
1400 km
1100 km
footprint
600 km
1.5 km/px
460 km
380 km
1.2 km/px
260 km
700 m/px
500 m/px
400 m/px
300 m/px 1 2 3 4 5 6
time
80 s
80 s
80 s
80 s
80 s
Helsinki, September 4, 2006

30. image 1

31. image 3

32. image 6

35. Syrtis Major 20 10
MOLA map 60 70 80

36. Syrtis Major
Nili Fossae 20
Nili Patera 10 60 70 80

39. Syrtis Major ancient crust early lava flows LCP / HCP mix20
LCP / HCP mix
olivine-rich spots 10
impact melts
and
phyllosilicates 60 70 80

40. Mars FlyBy: CIVA science & operations
- 6 images are planned for Mars, one every 80 s
then
- 1 image is planned for Phobos (camera 2) 1 2 3 4 5 6
80 s
80 s
80 s
80 s
80 s
Helsinki, September 4, 2006

41. Philae status 21st Rosetta Science Team meeting
5. 2nd Philae Science Team meeting
- Update on Deep Impact & StarDust
- impact to Philae landing/operations
easy landing, pristine close to surface
- Review of joined RPC/ROMAP investigations
- Mars SwingBy and on-comet opportunities
- Update on upcoming activities
- PC4 and Mars SwingBy
- Update on release strategy / descent
- risk assessment and requirements/actions
- Update on on-comet science sequencing
ESOC, September 14, 2006

42. AOB
If ever NASA selected one Discovery mission complementing Rosetta by sending a probe to impact G-C mid to late 2015,
Philae would
consider it very positively, and
offer a large scope of potential cooperation.
ESOC, September 14, 2006

43. Philae comet modeling activities and requirements
1. High operational criticality
Enhancement of landing robustness against criticality brought by comet change require much higher determination of the comet global parameters and of its surface and environmental properties: not merely a scientific activity, but an operational, highly time-driven, one.
2. Philae sees a critical need to
- acquire and process the relevant data during the pre-mapping phase;
- update models of both the surface and its environment.
3. Philae can offer a variety of contributions, at observation, data reduction (e.g. DTM reconstruction) and modeling level (CoIs, CNES)
4. ESOC should play a major (leading ?) role in this effort.
ESOC, September 14, 2006