Cassini s Grand Finale Science Highlights & End of Mission
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1 Cassini s Grand Finale Science Highlights & End of Mission Scott G. Edgington and Linda J. Spilker Jet Propulsion Laboratory/California Institute of Technology September 6, 2017
2 Cassini-Huygens Mission Overview 2
3 Protecting Saturn s Ocean Worlds
4 Solstice Mission Trajectory Ring-Grazing orbits Grand Finale orbits Impact orbit 4
5 Key Characteristics of Final Orbits 42 short-period orbits Nov to Sept F ring orbits Periapses just outside Saturn s F ring Sets up Cassini for final jump to orbits inside D ring 22 Grand Finale orbits Periapses in 2,400 km clear zone
6 Titan Clouds Reappear
7 Saturn s Rings in High-Def Mon, Aug 14, 2017 Cassini Grand Finale - Div. 39 Noontime Seminar 7
8 Probing Saturn s Interior Gravity will es;mate: size of rocky core depth of winds mass distribu;on
9 Probing Saturn s Interior Magne;c field measurements will determine: rota;on rate depth of magne;c dynamo region
10 Ring Mass: Constrain age of rings 74,500 km 92,000 km 117,580 km 122,200 km 136,780 km C-Ring B-Ring GM= 1.9 km 3 /s 2 (Voyager) Cassini Division A-Ring Current uncertainty in ring mass is 100% of nominal value 6 gravity passes to measure total ring mass will reduce uncertainty to about 5% Less massive: young rings; more massive: old rings 10
11 First In-Situ Measurements of Exosphere and Innermost Radiation Belts Strength of innermost radiation belt Plasma composition Saturn s auroral magnetosphere 11
12 Final Orbits Science: Unique Observations First ever direct measurements of ring par;cle composi;on Highest resolu;on main ring observa;ons Radio occulta;on, imaging First ac;ve Radar Highest resolu;on Saturn polar observa;ons and aurora
13 Flying Through the Gap 22 Times
14 Proximal Corridor Distance from the Center of Saturn (km) Ring-Plane Crossings Minimum Al;tudes 60000
15 Dust Hazard Plan Distance from the Center of Saturn (km) Ring-Plane Crossings Shielded Crossings D-Ring Detec;on Boundary Minimum Al;tudes 60000
16 What We Expected Saturn Radio Plasma Waves What We Saw Where are the predicted large ring par/cles?
17 Soaring Over Saturn s North
18 The First Grand Finale Crossing
19 Saturn Noodle
20 Saturn Noodle April 26, 2017 June 29, 2017
21 Saturn Southern Aurora Nov 29, 2010 July 20, 2017
22 C Ring Plateau Structure Highest Resolu;on Image AWer Processing Mon, Aug 14, 2017 Cassini Grand Finale - Div. 39 Noontime Seminar 22
23 Rings Inside-Out A few orbits ago, in a Ring System Not-Too-Far Away.
24 A Cassini Family Portrait Jupiter Pluto Uranus Mon, Aug 14, 2017 Neptune Earth and Moon
25 Magnetic Field Observations Tilt of Magnetic field < 0.06º
26 Probing Saturn s Interior & Ring Mass Early analysis of gravity data so far shows discrepancies compared with parts of leading models of Saturn's interior.
27 Cassini Grand Finale
28 Cassini s Last Days Saturn and Rings Titan Peggy Enceladus setting behind Saturn Propellers
29 Skimming the Atmosphere First Passage on August 13, 2017 Cassini Grand Finale - Div. 39 Noontime Seminar
30 Final Hour with 10 -Lat Ticks Mon, Aug 14, 2017 Cassini Grand Finale - Div
31 Final 90 Seconds with 10-sec Ticks An;cipated Measurements of: Exosphere/Thermosphere (H 2, HD, He, CH 4, ) Temperature vs. Pressure Ionosphere (e -, H +, OH -, ) Ring rain Magne;c Field Plasma Waves Mon, Aug 14, 2017 Cassini Grand Finale - Div
32 Grand Finale Movie
33 Questions?
34 Backup 34
35 Last View of the Earth
36 Soaring Over Saturn s North
37 The View from the Gap 7:50 7:56 7:58 8:11 8:27 9:00
38 Opening Pandora s Box
39 From Cassini s Vista: A Pan-tastic View
40 Atlas Shoulders the Weight of the Rings
41 Saturn s Rings at High Resolution
42 November 30, 2016 F-ring Orbits Begin 20 orbits 3 maneuvers Grand Finale Timeline April 22, 2017 Last Targeted Titan Flyby Produces Grand Finale trajectory April 23, 2017 Grand Finale Begins 22½ orbits 9 non-targeted Titan flybys April 26, 2017 First dive through gap September 11, 2017 Last Non-targeted Titan Flyby Puts Cassini on impact trajectory September 15, 2017 Saturn Impact
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