1. Overview of the Rosetta Fly-by of 21-Lutetia as Observed by the OSIRIS Camera System
Stubbe Hviid1, C. Barbieri2, A. M. Barucci3, I. Bertini2, L. Baglivo2, S. Besse4, V. Da Deppo5, S. Debei2, M. DeCecco6, F. Ferri2, S. Fornasier3, O. Groussin7, P. J. Gutiérrez8, L. Jorda7, H. U. Keller9, M. Küppers10, C. Leyrat3, L. Lara8, M. Lazzarin2, J. De Leon8, S. Magrin2, S. Marchi2, M. Massironi2, R. Moissl1, W. Sabolo8, S. E. Schröder1, M. Pertile6, H. Sierks1, C. Snodgrass1, N. Thomas11, C. Tubiana1, J. Vincent1, P. Vernazza12, M. Zaccariotto2, OSIRIS Team
1Max Planck Institute for Solarsystem Research, Germany, 2University of Padua, Italy, 3LESIA, Observatoire de Paris, France, 4University of Maryland, 5CNR-IFN UOS Padua LUXOR, Italy, 6Univertity of Padua, Italy, 7Laboratoire d'Astrophysique de Marseille, Université de Provence, France, 8Instituto de Astrofisica de Andalucia, CSIC, Spain, 9Institut für Geophysik und extraterrestrische Physik (IGEP), Germany, 10ESA-ESAC, Spain, 11Physikalisches Institut, Universität Bern, Switzerland, 12ESA-ESTEC, Netherlands.

2. OSIRIS I
MPS Overall responsibility and project management, system engineering, interfaces, Focal Plane Assemblies, CCDs and Readout Boards, HK Boards, integration &qualification of E-Boxes, harnesses, system integration, high level software, NAC & WAC system calibration, QA, mission operations LAM NAC telescope, camera integration and qualification WAC optical bench, camera UPD Integration and qualification, shutter mechanisms and shutter electronics, Front Door Mechanisms (mechanisms for NAC and WAC) IAA Mechanism Controller Board INTA Filter Wheel Mechanisms, E-Box Power Converter Module, NAC & WAC CRB Power Converter Modules RSSD Data Processing Unit IDA Mass memory, low level software and data compression DASP NAC & WAC Filters UPM Thermal and structural analysis, NAC MLI, WAC FPA MLI

3. OSIRIS II NAC WAC Optical design Angular resolution Focal length Mass
Field of view
F-number
Spatial scale from 100 km
Typical filter bandpass
Wavelength range
Number of filters
Estimated detection threshold
3-mirror off-axis
18.6 µrad px-1
717.4 mm
13.2 kg
2.20 x 2.22° 8
1.86 m px-1
40 nm
250nm nm 12
18 mV
Optical design
Angular resolution
Focal length
Mass
Field of view
F-number
Spatial scale from 100 km
Typical filter bandpass
Wavelength range
Number of filters
Estimated detection threshold
2-mirror off-axis
101 µrad px-1
140(sag)/131(tan)
9.48 kg
11.34 x 12.11°
5.6
10.1 m px-1
5 nm
240nm - 720nm 14
13 mV

4. OSIRIS III 2048 x2048 backlit UV sensitive CCD Anti blooming
Full Well ~ e
Gain: 3 e/DN
Readout noise < 7 e
Thermal Noise ~0.01 DN/s
(39.33L Snodgrass et al.)

5. Lutetia Fly-By Distance [km] Angular Size [deg] Time [min]
Fly-By Speed: 15 km/s
Minimum distance: 3160km zero phase transit distance: ~17000km

6. OSIRIS Operations Lightcurve 9.5 hours SOPS -18min 0 phase 0min CA
EOPS
NAC
Shape Reconstruction
Spectral Cubes
Zero
Sat
WAC
shape Reconstruction
Na/OH
Spectral Cubes
Sat
Sat
Sat
Sat
Zero
234 NAC Images WAC Images were acquired

7. Overview

10. 43.04 Thomas et al
43.08 Kueppers et al

12. Lutetia Shape
43.03 Jorda et al

14. Color and Photometry
43.05 Keller et al
43.06 Leyrat et al

15. Opposition Effect
4.09⁰
2.01⁰
0.58⁰
0.05⁰

16. Hapke Modeling 951 Gaspra S 0.36 -0.18 0.06 1.63 29 0.22 0.11 433 Eros
ASTEROID
TYPE w g hS
BS0 θ Ap Ab
951 Gaspra S
0.36
-0.18
0.06
1.63 29
0.22
0.11
433 Eros
0.33
-0.25
0.01
1.40 28
0.23
0.092
253 Mathilde C
0.035
0.07
3.18 19
0.041
0.013
9P/Tempel 1
(CM)
0.039
(-0.49)
(0.01)
(1.0) 16
0.056
0.13
2867 Steins E
0.55
-0.27
0.061
0.63 26
0.41
0.24
21 Lutetia
M/C?
-0.26
0.047
1.86 31
0.18
0.065
0.21
-0.22
0.076
2.06 32 -
Using the same version of Hapke’s model as was used in the analyses of the above objects I get for Steins:
w=0.66, g=-0.30, hS=0.027, BS0=0.60, theta=28.

17. Summary
Old surface (~3.7Gy) with much younger regions created by ejecta blanket overlay
Highly fractured body but not a rubble pile
Thick layer of regolith
Impact blanket ~600m
Collapse ~5km
Indications of uneven distribution of regolith
Very rough surface
Very little color variability
No satellites found
Surface Physical Properties Fornasier et al
Cratering Marchi et al
39.03 Besse et al