UVIS TEAM MEETING
OPERATIONS UPDATE
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Instrument Status
• On/Off Cycle: 27
– No change since last meeting
• Hours On: ~73,300 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
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Significant Issues
•
•
S41: None
S42: UVIS_075SA_AURORA001_PRIME
– Significant data loss (DSN problem)
• S43: None
• S44: UVIS_086IC_ALPVIR001_PRIME
–
•
Data loss (DSN problem)
S45: UVIS_091IC_ALPVIR001_PRIME
–
•
Data loss (DSN problem)
S46: UVIS_097RH_ICYLON001_ISS ,
UVIS_097SA_SPOLEDYN001_RIDER
–
1/6/09
Significant data loss (weather & DSN problem)
UVIS TEAM MEETING
OPERATIONS UPDATE
Titan Star Occultation under RCS
•
S45 (T46)
UVIS_093ST_ETAUMATI001_PRIME &
UVIS_093ST_BETCMATI001_PRIME
– 0.5 mrd deadband
– During transition to or from RCS
•
S46 (T48)
UVIS_097ST_BETCMATI001_PRIME
– 0.5 mrd deadband
– Tightening of the walking deadband
•
•
–
1/6/09
3 steps of .12 mrad
Max deviation is .86 mrd per axis.
During transition from RCS
UVIS TEAM MEETING
OPERATIONS UPDATE
Titan Star Occultation under RCS
•
Shall we consider using the FUV
occultation slit?
– Need to offset by as much as 25
mrd to avoid the lens and the lens
holder.
– Cannot do that if an ORS instrument
is riding.
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE
RBOT Process
• Since S46: No more than 5 wheel
biases per orbit.
• Since S49: SP is suggesting “rbotfriendly” secondary axis.
• UVIS Statistics:
–
–
–
–
–
S46: 2 out of 16
S47: 2 out of 15
S48: 2 out of 7
S49: 0 out of 7
S50: 5 out of 18
• Preliminary (from SOP port 1)
• All 5 requests used “rbot-friendly” secondary axis…
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Planning/Scheduling Notes
• Not too much to complaint about this time.
– Don’t call a request xxxx_PRIME if it is not a prime
request.
• 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
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Upcoming Change
• Addition of a UVIS solar port entry in the BVT
(ECR 108546):108546
• Currently we use ISS_NAC to Sun with (-20.0,
0.0, -0.11 deg) offset
• An equivalent boresight will be used in CIMS,
PDT and loaded to the S/C BVT table:
UVIS_SOL_OFF
• The reason for the addition is to simplify the
RBOT solution for Solar observations.
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE
XXM Upcoming Changes
• New opmodes
– 3 UVIS standard modes: OFF, SLEEP, ON
• ON is currently 14.6 Watts, will be 9.4 Watts
• New ON does not allow HDAC filament modulation
– 1 non-standard mode: HDAC_Mod (14.6 Watts)
• New SSR library allocation (ECR 108786)
– Allocation changed from 128 ALFs to 640 ALFS
– Will allow us to keep a complete IEB library on
board the S/C and lower our uplink needs at the
start of every sequence.
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE
Ops team status for 09
• In addition of controlling 4 S/C the LASP ops
team will be launching one new S/C (Kepler
3/5/09) and two instruments (EVE on SDO
10/8/09) and TIM (on Glory 06/15/09).
• Crystal is on the Kepler flight team.
• During Kepler commissioning a small team
including Alain & Darren will be taking care of
QUIKScat and ICESat, two aging birds.
• In addition Alain supports Kepler S/W and has
to do S/W development (OASIS-CC)
1/6/09
UVIS TEAM MEETING
OPERATIONS UPDATE