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XXM Status, Priorities, Plans, and Activities Icy Satellite Science

XXM Status, Priorities, Plans, and Activities Icy Satellite Science. C. J. Hansen, A. Hendrix June 2014. XXM Status. Icy satellite observations executed since last team meeting Tethys and Enceladus phase angle / longitude coverage We have no PIEs in 2014. Satellite Flyby Hiatus.

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XXM Status, Priorities, Plans, and Activities Icy Satellite Science

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  1. XXM Status, Priorities, Plans,and ActivitiesIcy Satellite Science C. J. Hansen, A. Hendrix June 2014

  2. XXM Status • Icy satellite observations executed since last team meeting • Tethys and Enceladus phase angle / longitude coverage • We have no PIEs in 2014

  3. Satellite Flyby Hiatus

  4. Solstice Mission Enceladus Flybys • All Enceladus flyby’s in XXM have executed except E21 • E20 and E22 are relatively distant flybys on Rev 223 and Rev 228, resp., in 2015

  5. Proximal Mission Phase Priorities • Two more potential Enceladus stellar occs in the future • One is equatorial • 22 June 2017 01:19 Rev 280 Mean anomaly = 116 • The other requires a trajectory tweak – occ rayheight is currently 3000 km) • 11 March 2016 11:57 Rev 233 Mean anomaly = 220 • Approved • The other main priority for UVIS are the Dione stellar occ opportunities • MAG sees mass-loading in the magnetosphere at ~7 kg/sec (Enceladus supplies ~200 kg/sec) • Dione plume won’t go as high or lose as much gas (escape velocity is higher because Dione is larger, gravity higher)

  6. Locations probed previously Circles are ~250 km radius

  7. Future Occultations – PIEs lost, New requested Prime

  8. Locations - previous plus possible Circles are ~250 km radius

  9. Future Occultations – no PIEs Yet – in Proximal and F ring orbits

  10. Locations - previous plus planned plus proximal Circles are ~250 km radius

  11. Backup

  12. Reference Trajectory Schedule April 2013 Discuss Enceladus occultation with scientists May 2013 Gather initial feedback from science teams June 2013 Release of Enceladus occultation study for Summer PSG June/July 2013 Release of proximal orbits trade space October 2013 PSG decides on proximal orbit and approves Enceladus occultation trajectory January 2014 Preliminary release of reference trajectory March 2014 Final release of reference trajectory; covers remainder of tour

  13. System Scans - Summary of Request 167-168 17 June 2012 OR 169-170 2 August 2012 256 hr 196-197 5 August 2013 256 hr 206-207 3 August 2014 256 hr 211-212 25 January 2015 resume 4 per year 64 hr cadence

  14. Hello Helene! • Helene is Dione’s leading co-orbital; one of 4 of Saturn’s moons in the Lagrangian L4 point • Phoebe-size: 36 x 32 x 30 km • Sub-Saturnian side

  15. XXM Planning Status Requested PIEs for all occultations by: • Dione and Tethys • Look for volatiles being released, supplying E ring • Rhea • Look for rings or other evidence of volatile release • 15 occs requested • 8 in as occ PIEs • 2 “in” SOST but in conflict • 4 out • 1 not scheduled yet • Iapetus in apoapsis Rev 196 • Now looking at occs in proximal orbit

  16. Case 7a

  17. Occultations in F Ring and Proximal Orbits • 24 Dione occultation opportunities • 12 Rhea occultation opportunities When will we start scheduling PIEs?

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