DRAFT
Venus Observation OAT
Test Plan
Objectives:
Demonstrate Venus observation macro installation and execution
procedures.
Participants: HITT (TO), DMS (TC), Systems Management (TI), FOT, HST486 FSW,
OTA, Payload FSW, PCS/Safing, SI, STScI, and VEST.
Synopsis of On-Orbit Activity
Venus Proposal 13047 – “The D/H Ratio and Escape of Water from Venus” consists of
six visits that utilize the STIS/FUV-MAMA detector. Visits 3 and 6 perform dark sky
observations beyond the 50° threshold cited within Restriction 3.1.7.3 – “HST Sun
Pointing Limits”. Visits 1, 2, 4, and 5 perform the Venus observations that are ~46° away
from the Sun and require Restriction 3.1.7.3 to be waived. The current plan is to execute
the visits in consecutive orbits in the following order: 3, 1, 2, 5, 6, 4.
Prior to executing Proposal 13047, two Venus FSW macros will be loaded. The first
macro will be executed prior to the visits to modify six safe test responses from Inertial
Hold to Software Sunpoint (without load shed) and to modify the Sunpoint Sun Cosine
Limit from 46° to 42°. The second macro will be executed following the visits to restore
the nominal safe test responses and the Sunpoint Sun Cosine Limit.
For the Venus visits themselves, the SMS will include instructions for STIS to ignore the
Take Data Flag (TDF), but only if both the selected guide stars have not been used before
– AND – the STIS FSW is capable of ignoring the TDF for MAMA observations that
occur during vehicle slews that keep the moving target (i.e., Venus) fixed in the detector.
Test Resource Requirements
Test Facility:
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SMS Dry Run
VEST
DSTIF
VSTIF
ESTIF
DASDF
HST486 FSW Lab
HST Simulator
SITS
POCC in the Box
CCS String
None
Real Time Dry Run
VEST
DSTIF
VSTIF
ESTIF
DASDF
HST486 FSW Lab
HST Simulator
SITS
POCC in the Box
CCS String
None
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Formal Test
VEST
DSTIF
VSTIF
ESTIF
DASDF
HST486 FSW Lab
HST Simulator
SITS
POCC in the Box
CCS String
DRAFT
VEST Resource Requirements:
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Hardware
SSR-1 & 3 (EM'S)
ESTR-2
NSSC-1 (SIC&DH1)
DMU
DIUs 1, 2, 4, 5
HST486
PSEA
VIKs
SADE 1&2
SADE #2 – EM AND UT “ON”
FGE BRASSBOARD
OCE/AME (EM)
DCE
MCU
PCU
PDUs 1-4
CCCs 1-6
(2) DBA2 boxes (+, -)
DBC Cross-strap without VT
Signal Jumper Plug
EPTCE
All OTA PRI Busses ON
OTA Red Bus 5 ON, all other
Red Busses OFF
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PCSSIM Modeling
RSUs
RWAs
HGAs
SADE
MTE
MSS
FGSs 1,2,3
CSS
EPS
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Simulators
PCSSIM
Bus Monitoring Enabled
ACS OPS BENCH
COS OPS BENCH
NICMOS OPS BENCH
STIS OPS BENCH
WFC3 OPS BENCH
Mechanism Simulator
FGSSIM
VPCC
SA/DCE Controller
VLA
SAPC
VBS
SIMESTR(2)
Specific Test Limitations and Considerations
 This test setup provides flight-like testing for:
o Ground system processing and real time commanding through operational
CCS strings
o HST486 and NSSC-1 stored commanding and flight software processing
through the VEST SI C&DH hardware
o Venus Observation Macro execution
o STIS flight software processing through the STIS Ops Bench
 The science data generator does not create actual science data; however, the STIS
headers within the dumped images will be reviewed to verify exposure timing. Note
that the science data are not being forwarded to Pacor and OPUS.
 The attitudes involved with the actual Venus observations (Visits 1, 2, 4, & 5) are hot
with the +V1 axis pointed ~46.5° away from the Sun, well within the 50° threshold
cited within Restriction 3.1.7.3. Hardware temperatures within the test environments
do not model spacecraft attitudes. Consequently, actual hardware thermal profiles
will differ significantly relative to the test environment. TCS SEs will assess whether
these Venus observations will be in family with the previous Venus observations.
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DRAFT
Initial Conditions
 HST486 CPM 1 configured with FSW 3.7A (on-orbit configuration)
 NSSC-1 configured with FSW BQ 9.2 (on-orbit configuration)
 Nominal HST486 and NSSC-1 SPC load execution
 STIS configured with CS 5.02 (OV0010; on-orbit configuration) and in Operate
with MAMA low voltage off
 Venus Observation Macros transferred to test string
Test Synopsis
The test will begin one orbit prior to a Venus visit with STIS, the sole SI scoped within
Proposal 13047, set to its nominal configuration. Following SMS activation, an initial SE
monitoring period, and any requisite remaining test setup activities, the two Venus
observation macros will be loaded and the first macro will be executed to modify six safe
test responses from Inertial Hold to Software Sunpoint (without load shed) and to modify
the Sunpoint Sun Cosine Limit from 46° to 42°. The second macro will be executed
following the Venus visit to restore the nominal value for the Sun Cosine Limit and the
nominal safemode responses. The science data will be dumped and the SI SEs will verify
exposure timing by assessing the timestamps within the image headers.
SMS Requirements
 An SMS (HST486 & NSSC-1 SPC loads) containing one Venus visit (i.e., Visit 1,
2, 4, or 6), starting one orbit before and ending ≥two orbits after the visit.
o The SMS will configure STIS to Operate at the start of the SMS with the
MAMA low voltage off.
o The SMS will include instructions for STIS to ignore the TDF for the
Venus visits and to respect the TDF thereafter (i.e., to restore the nominal
configuration) only if the STIS FSW is capable of ignoring the TDF for
MAMA observations that occur during vehicle slews that keep the moving
target (i.e., Venus) fixed in the detector.
Success Criteria
 The Venus Observation Macros load and execute successfully.
o The Venus-specific values for the Sun Cosine Limit and the safemode
responses are set correctly by the first macro.
o The nominal values for the Sun Cosine Limit and the safe test responses
are successfully restored by the second macro.
o No changes to the Venus Observation macros are required.
 The SMS runs successfully through the Venus visit.
o No significant changes to stored commanding or proposals are required.
o Exposure timing is as expected.
References/Related Links
 Proposal 13047 – “The D/H Ratio and Escape of Water from Venus”
 IP-TBD – “Venus Observation SPC Macros”
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