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

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

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 2010 15:51 UT OSIRIS Lutetia preparation, Padova, 4 February 2010

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

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

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

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

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 19-21 UT OSIRIS Lutetia preparation, Padova, 4 February 2010

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

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

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

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