UVIS TEAM MEETING
OPERATIONS UPDATE
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Instrument Status
• On/Off Cycle: 27
– No change since last meeting
• Hours On: ~77,500 hours
– Continuous operations since 9/11/2007
– Longest continuous operations was from
1/15/2005 (probe relay) to 9/11/2007 (S/C safing)
• HDAC Filament Modulation:
– Filament 1: 100.28 hours
– Filament 2: 12.22 hours
– Last: 2006/255
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE
AI from last meeting #1
• Can we run HSP at 0.5 mlls?
• Closed (1/16/09)
• The answer is NO:
– As documented in logic design document.
– As tested on the EM.
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE
AI from last meeting #2
• Off axis Titan occultation under RCS
• Closed (1/27/09)
– Unfortunately I put the offset on the wrong axis in my email
to Bob
• Proposed pointing and instrument setup
– UVIS_FUV to star with (-1.375, 0.0,0.0) offset
– HDAC.ON=NO, HSP.ON=NO, FUV.ON=YES,
FUV.COMP=SQRT9, FUV.INT=1.75, FUV.SLIT=OCCULT,
FUV.N_OF_WIN=1, FUV.WIN1=1,1024,1,54,58,1,
EUV.ON=YES, EUV.COMP=SQRT9, EUV.INT=5.0,
EUV.OCCULT=CLOSE, EUV.SLIT=OCCULT,
EUV.N_OF_WIN=1, EUV.WIN1=1,1024,1,55,59,1
– We have a test of this configuration scheduled in S54
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Significant Issues
6/8/09
S47
UVIS_102RI_ALPARAOCC001_VIMS
UVIS_102RI_VENCUNMP001_CIRS
Data loss due
to weather
S48
Sequence de-activated during thruster
branch swap activity (071T02:10 to
077T03:05)
No data during
this period
S49
UVIS_109TI_FIRNADCMP001_CIRS
UVIS_110SW_IPHSURVEY002_RIDER
UVIS_110EN_ICYATM00 &
UVIS_110SW_IPHSURVEY003_RIDER
Data loss due
DSS 14 red
S50
UVIS_110SA_MOS110APO003_PRIME
Data loss due
to weather
UVIS TEAM MEETING
OPERATIONS UPDATE
Titan Occultation under RCS
•
S49 (T53)
UVIS_107ST_ALPERITI001_PRIME
– 0.5 mrd deadband
– Tightening of the walking deadband
•
•
–
•
3 steps of .12 mrad
Max deviation is .86 mrd per axis.
First part (no shown) has star in/out
of the slit
S50 (T56)
UVIS_112ST_ETAUMATI001_PRINE
– 0.5 mrd deadband
– Tightening of the walking deadband
•
•
–
6/8/09
Not on the ground yet
3 steps of .12 mrad
Max deviation is .86 mrd per axis.
During transition from RCS
UVIS TEAM MEETING
OPERATIONS UPDATE
RBOT Process
• UVIS Statistics:
– S50: 5 out of 18
– S51: 7 out of 21
– S52: 0 out of 3
– S53: 2 out of 3
• The process is improving at each
sequence.
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Planning/Scheduling Notes
• We are starting to flight sequences without a final
DSN allocation.
• Use UVIS_SOLAR_OFF to Sun in CIMS for all solar
occulation (starting S54) instead of ISS_NAC to Sun
(-20.0, 0.0, -0.11 deg) offset.
• The list of ring occultations that contain an
atmospheric occulation is on the team web site at
http://lasp.colorado.edu/cassini/team-site/archive/docs/pdf/Atmospheric_Occ.pdf
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Concerns
• What do we have to do in order to still
have a usable instrument in 2017?
– HSP is degrading
– The burn area in the FUV is getting deeper
and wider
• Turn off HVPS when FUV and EUV not in used
for more than ??? hours?
• Switch to the HI_RES slit if FUV and EUV not
in used for more that ??? Hours?
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Ops team status for reminder of 09
• Getting better now that KEPLER
commissioning has concluded.
• Still one instrument launch this year: EVE on
SDO (November).
• The launch of the TIM instrument on Glory
has been delayed (2010, 2011?).
• So we are breathing a little better.
6/8/09
UVIS TEAM MEETING
OPERATIONS UPDATE