1. GEOMETER Update
Get new version of GEOMETER from Team web site after August 8.
Some new parameters now computed (illum angles for “near point” of non-intersecting lines of sight); bug fixes which affect occultations at high precision (aberration, double precision).
Uses NAIF “ICY” package available from naif.jpl.nasa.gov via ftp.
User must ensure all appropriate kernels are loaded (kernels available from secure Cassini web site
Requires IDL 6.1.
January 5, 2005
UVIS Team Meeting

2. Capabilities
Calculate all relevant geometric parameters for corners and centers of all pixels and FOVs.
GEOMETER_ENGINE may be called separately by user-supplied software: returns pointing for one pixel at one time.
Visualization routines for mapping in sky, target body, and ring coordinate systems.
January 5, 2005
UVIS Team Meeting

3. January 5, 2005
UVIS Team Meeting

4. January 5, 2005
UVIS Team Meeting

5. SkyMap Pre-SOI
January 5, 2005
UVIS Team Meeting

6. Target View Pre-SOI
January 5, 2005
UVIS Team Meeting

7. Target View High Inclination
January 5, 2005
UVIS Team Meeting

8. List of Planned Upgrades
Lat/Lon grid on target bodies.
Shading of unlit hemisphere and shadowed rings.
Plotting of FOV footprints at multiple times to allow for user control of how FOVs are displayed.
Performance may be improved by using new vectorized ICY routines, (but backwards-compatability issues).
Let me know if you have suggestions or needs for new features in GEOMETER.
January 5, 2005
UVIS Team Meeting

9. UVIS Ring Observations
Stellar and solar occultations.
FUV and EUV spectra.
Meteoroid impact detection searches.
January 5, 2005
UVIS Team Meeting

10. Stellar Occultations
Initial set of 7 occultations completed. Next occ on July 25, 2006.
Range of resolutions and signal strengths.
Each part of ring system sampled at least once; parts of A ring sampled 9 times.
Optical depth variations observed in A ring.
January 5, 2005
UVIS Team Meeting

11. Xi Ceti Rev 00A Bin=125
January 5, 2005
UVIS Team Meeting

12. Ring Occultation PathsF
A ring
B ring
C ring
January 5, 2005
UVIS Team Meeting

13. 26 Tau Rev 8 Bin = 500
January 5, 2005
UVIS Team Meeting

14. Alp Vir Ingress Rev 008 Bin = 50
January 5, 2005
UVIS Team Meeting

15. Alp Vir Egress Rev 008 Bin = 50
January 5, 2005
UVIS Team Meeting

16. Del Aqr Rev 008 Bin = 250 (1 second)
January 5, 2005
UVIS Team Meeting

17. Alpha Leo Rev 009 Ingress and Egress Bin = 50
January 5, 2005
UVIS Team Meeting

18. 26 Tau Rev 010 Bin = 500
January 5, 2005
UVIS Team Meeting

19. Sig Sgr Rev 011
January 5, 2005
UVIS Team Meeting

20. Gravitational Wake Geometry
to star 
January 5, 2005
UVIS Team Meeting

21. Janus 2:1 Density Wave
January 5, 2005
UVIS Team Meeting

22. Encke Gap
Pan Wakes
Density Waves
January 5, 2005
UVIS Team Meeting

23. Zero Phase FUV Image
January 5, 2005
UVIS Team Meeting

24. 26 Tau Rev 008 FUV Image
January 5, 2005
UVIS Team Meeting

25. 26 Tau Rev 008 EUV Image
January 5, 2005
UVIS Team Meeting

26. Rev 00A Impact
January 5, 2005
UVIS Team Meeting

27. Rev 007 Impact
January 5, 2005
UVIS Team Meeting

28. Rev 011 Impact
January 5, 2005
UVIS Team Meeting

29. Status
Nearing end of first inclined orbit series: time to analyze data in more detail.
Opacity variations reveal 3D structure of rings.
Density waves provide mass and ring height measurements.
No strong impact signals: end of this series will allow constraints to be placed on flux.
Radial fluctuations in FUV albedo show uneven distribution of non-icy contaminants.
January 5, 2005
UVIS Team Meeting