1. Lutetia geometry and timeline
Lutetia updated information
Flyby geometry
Timeline
Break Points
OSIRIS Lutetia preparation, Padova, 4 February 2010

2. Lutetia size and spin axis
New data and analyses available
HST (Weaver et al.)
Combination of adaptive optics imaging, light curves and stellar occultations (Carry et al.)
Resulting new determination of albedo, size, rotation period and spin axis orientation
Size possibly larger than previous determinations (up to 134 x 102 x 94 km3, but still uncertain)
Below ~ -40 deg. latitude Lutetia will be in “polar winter” during the flyby
OSIRIS Lutetia preparation, Padova, 4 February 2010

3. OSIRIS Lutetia preparation, Padova, 4 February 2010
Flyby distance
Closest Approach Distance 3160 km
Driven by payload requests and asteroid flyby mode
Flyby Speed 15 km/s
Angular size of Lutetia at closest approach ~ 1.8 degrees
Time of closest approach: 10 July :51 UT
OSIRIS Lutetia preparation, Padova, 4 February 2010

4. OSIRIS Lutetia preparation, Padova, 4 February 2010
Phase Angle
Approach from near-noon morning side, closest approach through local afternoon, receding approximately through midnight
Phase angle on approach ~11 degrees, after flyby ~168 degrees
Flyby through 0 phase angle 18 minutes before Closest Approach
Maximum rate of change of phase angle 0.27 degrees/second
OSIRIS Lutetia preparation, Padova, 4 February 2010

5. OSIRIS Lutetia preparation, Padova, 4 February 2010
Timeline (general)
22 February: OIOR deadline for Dynamics Rehearsal
1 March: Preliminary OIORs for Lutetia
15 March: Dynamics Rehearsal
3 May: Final OIORs
10 July: Closest approach
OSIRIS Lutetia preparation, Padova, 4 February 2010

6. Lutetia Orientation in Field of View
z-axis angle:
180°: Rosetta over north pole
90°: Rosetta over equator
0°: Rosetta over south pole
OSIRIS Lutetia preparation, Padova, 4 February 2010

7. Lutetia flyby rehearsal on 15 March
Lutetia flyby dynamics will be rehearsed on 15 March
Time from flip until ~1 hour after closest approach will be covered
Payload instruments may participate for monitoring purposes (not a rehearsal of full payload operations)
OIOR deadline 22 February 2010
OSIRIS Lutetia preparation, Padova, 4 February 2010

8. Flyby timeline (OSIRIS)
19 astrometry slots for navigation
First slot 31 May
Two slots each in weeks starting 7 June, 14 June, and 21 June
Daily slots 28 June – 9 July (12 slots)
Lightcurve at CA – 80 hours on 7 July 05:10 – 17:10 (after navigation slot 17, roughly 82.5 – 70.5 hours before CA)
16 Cyg (stellar calibration) on 7 July UT
OSIRIS Lutetia preparation, Padova, 4 February 2010

9. Flyby Timeline (OSIRIS) II
Closest approach observations start 09 hours 45 minutes before closest approach
After last TCM slot
Boresight initially AL narrow slit centre, changes to Cooperation boresight at start of flip
Spacecraft flip 4h:20 minutes – 3h:40 minutes before closest approach
Asteroid flyby mode 1h 12 minutes before to 30 minutes after closest approach (incl. attitude stabilisation), followed by MIRO slew through south pole
Closest approach expected 15:54 on July 10
OSIRIS observations expected to stop 22 minutes after closest approach latest (20 degrees solar elongation)
OSIRIS Lutetia preparation, Padova, 4 February 2010

10. Co-operation boresight around closest approach similar to Steins
OSIRIS Lutetia preparation, Padova, 4 February 2010

11. OSIRIS Lutetia preparation, Padova, 4 February 2010
Flyby Timeline (III)
After closest approach (18:30 on July 10) support for AL boresight determination on Lam Aql
Vega observation 12 July 00:00-02:00
Break point 1 allows to recover closest approach operations, break point 2 probably too late for OSIRIS (switch-on <5 hours before closest approach)
Recovery OIOR for break point 1 transfers OSIRIS from off to the state after Navigation slot 1
OSIRIS Lutetia preparation, Padova, 4 February 2010

12. OSIRIS Lutetia preparation, Padova, 4 February 2010
Break point 1
TCM
Nav. Slot 19
Closest approach observations
9 July 03 UT
~10 July 06 UT
OSIRIS Lutetia preparation, Padova, 4 February 2010