STIS SMOV Science Report
Friday, August 21, 2009
SMOV meeting
Aug 21, 2009
1
STIS Activity
PropID
STIS SMOV Program Title
Analysis
Lead
Visits
Done
Total
Visits
STIS02
11347
STIS03
Memory Load and Dump
BS
1
1
Complete
11348
Science Data Buffer Check
BS
3
3
Complete
STIS04
11349
Mechanism Mini-Functional
TW
1
1
Complete
STIS05
11399
CCD Anneal (two anneal iterations)
MW
6
6
Complete
STIS06
11382
CCD Functional
DL
4
4
Complete
STIS07
11404
CCD Dark & Bias Monitor
MW
90
105
Ongoing
STIS08
11383
Aperture Wheel & Lamp Functional
WZ
2
2
Complete
STIS09
11384
STIS-to-FGS Alignment
CP
1
1
Complete
STIS10
11385
CCD Spectral Format Verification
WZ
1
1
Complete
STIS11
11386
External Focus Check
CP
4
3+1
Complete
STIS12
11387
Corrector and Focus Alignment
CP
-
8
Contingency
STIS13
11388
CCD External Spectroscopic Quality
TG
1
1
Complete
STIS14
11400
CCD CTI Check
PG
1
1
Complete
STIS15
11401
CCD Spectroscopic Throughputs
DL
3
3
Complete
STIS16
11389
CCD Image and Pointing Stability
TG
1
1
Repeat? LVPS changes?
STIS17
11350
FUV MAMA HV Recovery
TW
4
4
Complete
STIS18
11351
NUV MAMA HV Recovery
TW
2 (+2F)
4 (+2F)
STIS19
11390
FUV MAMA Dark Measure
CP
10
10
STIS20
11402
NUV Dark Monitor
CP
3 F+21
20+…
STIS21
11391
FUV Optical Format Verification
WZ
2
2
Complete
STIS22
11392
NUV Optical Format Verification
WZ
2 (+2 F)
2 (+2F)
Analysis
STIS23
11393
FUV MAMA Spectroscopic Quality
TG
1
1
Complete
STIS24
11394
NUV MAMA Spectroscopic Quality
TG
1
1
Complete
STIS25
11403
MAMA Spectroscopic Throughputs
DL
3
3
Analysis
STIS26
11395
MAMA Image Stability
TG
2
229, 236
SMOV meeting
Status
Complete
Complete
ongoing analysis
Aug 21, 2009
2
Upcoming Observations
•
Last planned STIS SMOV visits (other than NUV darks) execute
Sunday and Monday
–
11395 MAMA Image Stability



•
•
08-23 15:16:00 - 08-23 18:33:03
08-24 13:05:00 - 08-24 16:19:00
Internal Lamp exposures only
These will complete the planned STIS SMOV observations.
However, some caveats about STIS bench and image stability remain
SMOV meeting
Aug 21, 2009
3
STIS Stability
•
The low E140H exposure seen in 11403 suggests that large breathing may
be causing larger than expected throughput changes
– Comparison of internal lamp exposures suggests relative throughput of
E140H and E140M unchanged


–
Next standard star observation using E140H not scheduled until
November. May ask to bring this 2 orbit Cycle 17 CAL/STIS visit forward
if LRP allows.

•
Comparing 2002 & 2010 E140H & E140M deep wavecals show that in the
FUV the LINE lamp has declined by about 20%, but no difference between
gratings
Since E140M external observation shows the expected throughput, this
supports hypothesis that low E140H flux was due to large breathing excursion
May move E140H exposure to middle of orbit to minimize breathing
Test for relative stability of aperture plane with sky (11389) had been done
with MAMAs off, so bench heaters kept instrument unusually stable
– Will evaluate bench thermal response to this weekend’s test
(11395)before deciding whether to ask for 11389 to be repeated with
MAMAs on (2 orbits)
SMOV meeting
Aug 21, 2009
4