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Upcoming Events & Other Stuff June 2014 – January 2015

Upcoming Events & Other Stuff June 2014 – January 2015. Shawn M. Brooks – UVIS Investigation Scientist UVIS Team Meeting Berlin, Germany 16-18 June 2014. Tour Status. Sequence S84 began executing on 24 May. Rev 205 started Saturday, 31 May: period = 31.9 days inclination = 44.3˚

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Upcoming Events & Other Stuff June 2014 – January 2015

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  1. Upcoming Events& Other StuffJune 2014 – January 2015 Shawn M. Brooks – UVIS Investigation Scientist UVIS Team Meeting Berlin, Germany 16-18 June 2014

  2. Tour Status • Sequence S84 began executing on 24 May. • Rev 205 started Saturday, 31 May: • period = 31.9 days • inclination = 44.3˚ • eccentricity = 0.537 • periapse = 13.470 Rsaturn; apoapse = 50.833 RSaturn • T101 occurred May 17; T102 is occurring June 18 (i.e. as I speak!) • During the next 6 months, we will: • Reduce our orbital inclination by 20 degrees as we move towards EQ-2, which begins March 2015

  3. XXM Tour Timeline

  4. Rings Observations • 4 UVIS stellar ring occultations through December 2014: • aPuppis rev 208(2) • zVirginis rev 210, 211 • One ring composition observation: RINGMAP, rev 208

  5. Titan Flybys June 2014 – September 2014 • T102 June 18 3659 km RSS • UVIS inbound/outbound riders (CIRS) • T103 July 20 5103 km UVIS • solar occultation, EUVFUV, aEri stellar occultation, inbound/outbound riders (CIRS) • T104 Aug 21 964 km RADAR • UVIS inbound/outbound riders (CIRS, VIMS) • T105 Sep 221400 km VIMS • UVIS hUMa stellar occultation, EUVFUV inbound & outbound, inbound/outbound riders (CIRS)

  6. Titan Flybys October 2014 – January 2015 • T106 Oct 23 1013 km INMS • UVIS inbound/outbound riders (CIRS, ISS, VIMS) • T107 Dec 10 980 km RSS • UVIS inbound/outbound riders (CIRS)

  7. Icy Satellite Flybys • None – not even non-targeted  • PIES: • None • Other observations: • However, there are several XD observations. • Phase-longitude mapping: • Mimas: revs 207, 211 (3) • Enceladus: rev 206 • Dione: rev 206 • Tethys: revs 210 (2), 211 (2) • Rhea: rev 209

  8. High-Priority Saturn Observations • Saturn EUVFUV: revs 207 (4), 208 (4) • Saturn stellar occultations (g Columbae, a Lyrae): rev 205, 210 • Auroral stares, slews: revs 205 (2), 206, 207, 208 (2), 209 (4), 210 (5) • includes SWAURPTGs and SWSKRPTGs from CAPS • UVIS_210SA_AURMIMAS001 investigates Mimas coupling in Saturn’s aurora • Saturn thermosphere scans: rev 205, 208 • Saturn system scans: ~175 hours in rev 206 • And one standard Spica calibration on DOY 131 (rev204)

  9. S84 UVIS SPASS (DsOY 145–212)

  10. S85 UVIS SPASS (DsOY 212–279)

  11. S86 UVIS SPASS (DsOY 279–351)

  12. Other Stuff

  13. CIRS Thermal Model Status • The CIRS thermal model for Saturn (+ rings!) heating is too simple and conservative. It must be updated for proximal orbit planning. • Solar heating is easy to model. • A new model has been developed, put through V&V at Goddard and delivered to JPL. • Pending paperwork (an ECR), the code will be implemented into a future PDT delivery. • Timeline for KPT implementation not set • VIMS approach to the issue being deliberated (!)

  14. Proximal Orbit Exercise • SPST & Project Science initiated a proximal orbit integration and implementation exercise. The intent was twofold: • scope the proximal orbit workload • and start teams thinking about the logistical problems inherent to these geometries. • UVIS was assigned six observations to design: one stellar occultation, one ring composition and four auroral observations. • SASFs were due 11 June. AACS analysis of the merged product is anticipated this week.

  15. Proximal Orbit Exercise • Some musings: • Occultation and ring stare design straightforward, auroral observations poorly placed. (A. Jouchoux) • Observation design must be more mature at implementation (i.e. PDT work in integration). • Difficult to avoid flight rule violations during proximal periapses; goal should be to mitigate and minimize impacts of FR violations. • CIRS, VIMS heating FRs not the only ones of importance (e.g. SRU violations). • Please communicate lessons learned!

  16. F-Ring/Proximal Science & Ops • SPST, Project Science are gearing up for the 3-step PIE and segmentation processes. • C/A±1 hour periods in the proximal orbits to be allocated by DWG leads • RSS gravity passes to be placed • DWG leads to negotiate any conflicts between 100 PIE hours submitted by each discipline • Proximal segment allocations will be primarily Rings, Saturn, and MAPS • Still require DSN strawman plan

  17. F-Ring/Proximal Science & Ops • Sequences boundaries (e.g. two five-week vs. one ten-week duration), NAV maneuver placement under consideration: • Intended to keep trajectory uncertainties within a particular limit • What level of uncertainty can UVIS observations tolerate in the proximal orbits? • The latest (and final!) reference trajectory has been released (140414). • Please update your software tools!

  18. Summary • End of IN-1 rapidly approaching. UVIS featured during two Titan flybys: T103, T105. • S84 began execution in late May. S85 is in PSIV; S86 is in Port2. S87 starts in July. • The Proximal Orbit Exercise appears to have accomplished many of its goals. Results will feed back into engineering studies at JPL. • With the Senior Review behind us, expect work on F-ring and proximal PIEs and segmentation to get under way …

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