200 likes | 212 Vues
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˚
E N D
Upcoming Events& Other StuffJune 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˚ • 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
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
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)
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)
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
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)
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 (!)
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.
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!
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
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!
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 …