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Rita Schulz Rosetta Project Scientist

The ROSETTA Mission Exploring Solar System Formation. Rita Schulz Rosetta Project Scientist. Rosetta. One Comet rendezvous Two Asteroid fly-bys. Launch: 2 March 2004 with Ariane 5 Journey:

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Rita Schulz Rosetta Project Scientist

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  1. The ROSETTA Mission Exploring Solar System Formation Rita Schulz Rosetta Project Scientist

  2. Rosetta One Comet rendezvous Two Asteroid fly-bys

  3. 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 **) Rosetta Milestones

  4. Scientific Payload Rosetta • 11 Orbiter Instruments/ • (Instrument Packages) • 18 Experiments Payload Mass: ~170 kg + Lander: ~110 kg 10 Lander Instruments/ (Instrument Packages) => 16 Experiments Payload Mass: ~27 kg

  5. 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 Rosetta Scientific Payload

  6. The Journey

  7. Rosetta Mission Scenario includes Two Asteroid Fly-bys (2867) Steins (21) Lutetia • Closest approach: • 5 Sept. 2008 18:38:19 UT • r = 2.14 AU, Δ = 2.41 AU • Relative velocity: 8.62 km/s • Min. flyby distance: 802.6 km • Closest approach: • 10 July 2010 15:44:57 UT • r = 2.72 AU, Δ = 3.05 AU • Relative velocity: 15 km/s • Min. flyby distance: 3160 km

  8. 1 km 1 km 60 % of surface resolved Asteroid (2867) Steins Overall dimensions: 6.67 × 5.81 × 4.47 km3 Spherical equivalent radius: 2.65 km

  9. (2867) Steins – Opposition Effect Geometric albedo near 0 phase image: 0.40 ± 0.01 Phase function -> surface roughness

  10. Model Observations (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 -> age of surface Crater scaling laws

  11. YORP Effect and Geology Reshaping due to YORP spin up (Yarkovsky-O’Keefe-Radzievskii-Paddack) YORP effect can modify the rotation rate and spin-axis orientation of small asteroids. Important 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).

  12. (21) Lutetia – approach phase

  13. Overall dimensions: 123 × 103 × 93 km3

  14. Pixel size: 60 m

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