Rita Schulz

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The ROSETTA Mission Exploring Solar System
Formation
Rita Schulz Rosetta Project Scientist
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Rosetta
One Comet rendezvous Two Asteroid fly-bys
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Rosetta Milestones

• Launch 2 March 2004 with Ariane 5
• Journey
• 3 Earth gravity assists
  Mar 2005, Nov 2007, Nov
  2009
• 1 Mars gravity assist
  Feb 2007
• 2 Asteroid flybys
  2867 Steins Sep 2008, 21 Lutetia Jul
  2010
• Comet Rendezvous maneuver May
  2014 m(4 AU)
• Lander delivery
  Nov 2014 (3 AU)
• Perihelion Passage
  Aug 2015 (1.24 AU)
• End of Nominal Mission
  Dec 2015 (1.9 AU )

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Scientific Payload
Rosetta

• 11 Orbiter Instruments/
• (Instrument Packages)
• 18 Experiments

Payload Mass 170 kg Lander 110 kg
10 Lander Instruments/ (Instrument Packages) gt
16 Experiments
Payload Mass 27 kg
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Rosetta Scientific Payload

• The Rosetta Orbiter
• Remote sensing ALICE, OSIRIS, VIRTIS, MIRO
• Composition analysis ROSINA, COSIMA
• Nucleus large-scale structure CONSERT
• Dust flux and physical properties GIADA, MIDAS
• Comet plasma environment RPC
• Radio science RSI
• The Lander Philae
• Imaging CIVA, ROLIS
• Composition analysis APX, COSAC, Ptolemy
• Physical properties MUPUS, SESAME
• Nucleus large-scale structure CONSERT
• Magnetic field and plasma ROMAP
• Drill and sampling device SD2

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The Journey
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Rosetta Mission Scenario includes Two Asteroid
Fly-bys
(2867) Steins (21) Lutetia
Closest approach 5 Sept. 2008 183819 UT r
2.14 AU, ? 2.41 AU Relative velocity 8.62
km/s Min. flyby distance 802.6 km
Closest approach 10 July 2010 154457 UT r
2.72 AU, ? 3.05 AU Relative velocity 15
km/s Min. flyby distance 3160 km
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60 of surface resolved
Asteroid (2867) Steins
Overall dimensions 6.67 5.81 4.47 km3
Spherical equivalent radius 2.65 km
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(2867) Steins Opposition Effect
Geometric albedo near 0 phase image 0.40 0.01
Phase function -gt surface roughness
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(2867) Steins Cratering History
Crater density not saturated
Steins surface younger than mean collisional age
(2.2 Ga)
Age 0.154 0.035 Ga (NSL) or 0.49 to 1.6 Ga
(HSL)
Crater number size -gt age of surface
Crater scaling laws
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YORP Effect and Geology
Reshaping due to YORP spin up (Yarkovsky-OKeefe-R
adzievskii-Paddack)
YORP effect can modify the rotation rate and
spin-axis orientation of small asteroids. Importan
t process driving their physical and dynamical
evolution. Material sliding towards the equator.
Catena with 7 pits on one side large fault on
the opposite side likely produced by large impact
creating 2.1-m sized crater. Steins not a
monolith, but strongly fractured (may be a rubble
pile).
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(21) Lutetia approach phase
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Overall dimensions 123 103 93 km3
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Pixel size 60 m
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